How long is the flowering period of alfalfa?

Question 1: When does alfalfa bloom? The growing season in North China is from April to June, and the optimum temperature for high flowering period is 22-27℃, and it blooms at 9- 12 in the morning. It is forbidden to have high temperature and rain when flowering. But in our south, flowers can be seen everywhere all year round. It depends on your area!

Alfalfa picture: image.baidu/...ln=633

I don't know if it's what you said.

Alfalfa is sometimes called Tian Zi Cao. I hope it helps you!

Question 2: How long can alfalfa be harvested (subject to flowering)? If you plant it now and freeze it, it will be one crop. Even if it can be harvested twice, the yield will not be high.

Question 3: When will alfalfa be planted? Sowing can be done in both spring and autumn, but the effect of sowing in autumn is better than that in spring. During sowing, the land should be flat, solid, moist and fertile.

Question 4: How to grow alfalfa? Here, let's see if it's ok ~

alfalfa

alfalfa

Leguminosae alfalfa is a perennial herb. Also known as purple alfalfa, alfalfa. An important feed and green manure crop.

Origin and Distribution Alfalfa is native to Asia Minor, Iran and Transcaucasia. There are records of planting in Persia in 700 BC. Around 500 BC, it was introduced to Greece from Midian (now the ancient kingdom in the northwest of Iran), Italy in 1 century BC, Spain in the 8th century, America in16th century, and it was also planted in Australia and New Zealand in18th century. In BC 126, when Zhang Qian went to the Western Regions, it was introduced into China from the ancient country Y (namely Kashmir), and was first planted near the emperor's palace to feed horses. Later, it spread from Xi to the Yellow River Basin. Alfalfa is now widely planted all over the world. In the 1970s, the world's total cultivated land area was more than 33 million hectares, of which the United States accounted for about 32.7%. Since 1980s, China's cultivated land area has reached more than 1 10,000 hectares, mainly distributed in northern provinces.

Morphological characteristics Alfalfa has developed main roots and many lateral roots. The buried depth of taproot is more than 2 meters, which can reach about 10 meter in arid areas. The stem is 30 ~ 100 cm high, upright or outward, round or prismatic, the young stem is sparse, the rhizome is developed, and the branches generated by the expansion of the root neck are generally 15 ~ 60, up to 100 at most. Leaves trifoliate, obovate, broad apex and teeth. Flowers are racemes, with 8 ~ 25 purple irises axillary. Pods are spiral, 2-4 circles, dark brown, with 4-8 seeds per pod. The seeds are kidney-shaped, yellow-brown, and the 1000-grain weight 1.5 ~ 1.9 g (see figure).

Alfalfa has wide adaptability, but likes warm, sunny and dry climate. The annual precipitation is 500 ~ 900 mm, which is not conducive to growth if it exceeds 1000 mm; In the absence of irrigation conditions, it is difficult to grow normally when it is less than 300 mm Strong cold tolerance, seeds can germinate at 4 ~ 6℃. After emergence, it can tolerate the low temperature of -5 ~-6℃ for a short time, and the adult plant can tolerate the low temperature of -20 ~ 30℃. Under the cover of snow, the low temperature of MINUS 40℃ will not be frozen. The optimum temperature for growth is 20 ~ 25℃, and high temperature will inhibit growth. Need more water; It takes 446 ~ 500g water to form 1g dry matter and 800g water to form 1g seed. However, due to the developed root system, it has strong drought resistance. The most taboo is waterlogging, and a large number of people die when they are flooded for 24 ~ 28 hours during the growing period. Suitable for planting in neutral soil with deep soil layer, underground water level below 2 meters and good drainage.

A number of excellent varieties have been screened out in China, such as Guanzhong alfalfa with early development and fast growth, Longdong alfalfa with high yield and large plant type, Xinjiang alfalfa with strong regeneration ability, middle-maturing alfalfa in southern Shanxi, northeast alfalfa with strong cold tolerance and so on. , can adapt to the local ecological environment well.

Soil preparation and moisture conservation should be carried out before planting and sowing. In northern China, winter sowing "seed delivery" (sowing seeds in the soil until early emergence in the following spring) or top sowing in early spring is generally adopted to protect seedlings from drought. Autumn sowing in Northeast China, Northwest China and Inner Mongolia should not be later than early August; North China should be before September. Late sowing will lead to poor root development and affect overwintering. The sowing amount of pure seeds with high germination rate per hectare is about 15 kg, which can be reduced appropriately when mixed with other crops. Generally, the row spacing of drilling is 1.5 ~ 30 cm, and the sowing depth is 1.5 ~ 2 cm. Seedling growth is slow, so management should be strengthened to prevent the harm of weeds. Fertilizers, especially phosphorus and potassium fertilizers, should be applied in time after mowing. Common pests are aphids, thrips, alfalfa bedbugs, alfalfa moths and leaf miners. Diseases include Sclerotinia sclerotiorum, downy mildew, rust, brown spot and powdery mildew. After using pesticides, feed livestock at regular intervals to prevent poisoning. For seed-reserved cultivation, the plots with high terrain and good drainage should be selected, the sowing amount per hectare should be 7.5 ~ 1 1 kg, the row spacing should be 40 ~ 60 cm, and phosphorus and potassium fertilizer should be applied. Bee release or artificial pollination can improve seed yield.

Alfalfa is rich in nutrition, palatable and easy to digest, and is known as the "king of pasture". From the initial flowering stage to the full flowering stage, fresh grass contains about 76% water, 4.5-5.9% crude protein, 0.8% crude fat, 6.8-7.8% crude fiber, 9.3-9.6% nitrogen-free extract, 2.2-2.3% ash, and contains a variety of amino acids. Alfalfa can be grazed directly, but the green stems and leaves contain saponin, so as to prevent livestock from overeating and flatulence. It can also be made ... >>

Question 5: How long can alfalfa live? Is it better to raise water or to use the characteristics of soil and pasture?

Alfalfa is a perennial leguminous forage grass with strong resistance and wide adaptability, which can grow in various climates and soil environments. Sex likes dry, warm, sunny and rainy climate and highly dry, loose, well-drained and calcium-rich soil. The optimum temperature is 25 ~ 30℃; Where the annual rainfall is 400 ~ 800 mm, the growth is good, and when it exceeds 1000 mm, the growth is poor. The annual rainfall is less than 400 mm, and it needs irrigation conditions to flourish. Rainy and humid weather is the most unfavorable in summer. Alfalfa has high transpiration coefficient and large growth water demand. Every 1 g dry matter needs about 800 g of water, but water accumulation is the most taboo. If it is flooded continuously for 1 ~ 2 days, a large number of people will die. Alfalfa is suitable for planting in neutral to slightly alkaline soil, but not in strong acid and alkali soil. The optimum pH value of soil is 7 ~ 8, and the soil can grow when the soluble salt content is lower than 0.3%. Areas below 2700 meters above sea level, frost-free period 100 days or more, annual accumulated temperature 10℃ or more, and annual average temperature above 4℃ are all suitable for planting alfalfa. Alfalfa is a plant with strong light, and the maximum amount of carbon dioxide assimilated by its leaves is 70 mg per square meter per hour. The starch content in leaves changed greatly day and night, and the dry weight increased from 8% in the morning to 20% at sunset, and then the content decreased sharply. Leaves are places of photosynthesis. The leaf area index of well-developed alfalfa population is usually 5,5000 ~15000 leaves per square meter.

cultivation techniques

(1) Soil tillage and fertilization Alfalfa seeds are small, the young buds are thin and weak, and the top soil force is poor. The soil preparation must be fine, and the ground should be flat, with fine clods, no weeds and good water content. Alfalfa root system is developed and buried deeply, and the sowing ground should be turned deeply to make the root system fully developed. Alfalfa has a long growth period, more cutting times and more nutrients absorbed from the soil. It is reported that the nutrients absorbed by alfalfa per mu are nitrogen 13.3kg, phosphorus 4.3kg and potassium 16.7kg each year. Nitrogen and phosphorus are 1 ~ 2 times more than wheat, and potassium is 3 times more. The land used for sowing alfalfa should be harvested before last year, that is, shallow ploughing and stubble clearing, and then deep ploughing. We should do a good job of raking, leveling, storing water and conserving moisture in winter and spring. The irrigated land should be filled with winter water, shallow ploughing or harrowing should be carried out before sowing, and combined with deep ploughing or shallow ploughing before sowing, organic fertilizer 1500 ~ 2500 kg and calcium superphosphate 20 ~ 30 kg should be applied per mu as base fertilizer. For low soil fertility, ammonium nitrate and other quick-acting nitrogen fertilizers should be applied during sowing to promote seedling growth. Top dressing should be applied after mowing every time, and calcium superphosphate 10 ~ 20kg or diammonium phosphate 4 ~ 6kg should be applied per mu.

(2) Sowing 1. Seeds. Seeds should be dried for 2 ~ 3 days before sowing to break dormancy and improve germination rate and seedling uniformity. Dantian should sow a class of seeds specified by the national or provincial forage seed standards; Sow first, second and third-grade seeds on the grassland. 2. Vaccinate. When sowing on the land where alfalfa has never been planted, alfalfa rhizobia should be inoculated, and each kilogram of seeds should be made into bacterial liquid with 5 grams of microbial agent, which should be sprinkled on the seeds, fully stirred and mixed for sowing. When the sterile agent is used, the soil in the old alfalfa field is mixed with the seeds at a ratio of at least1:1. 3. Sowing amount. 3.75 ~ 7.5 kilograms per hectare of field and grassland 1 1.25 ~ 15 kilograms per hectare, and the sowing amount in dry land, hillside or alpine region increased by 20 ~ 50%. 4. sowing date. Because of the different climate in Gansu, it can be divided into three situations: spring sowing. After the land is thawed in spring, it should be sown at the same time as the spring crops. Spring-sown alfalfa developed well and had high yield. It was planted in Yichun, Tian. Summer broadcast. In arid areas, when the spring is dry and the soil moisture is poor, you can grab the moisture and sow after the rain in summer. Autumn sowing. In northern China, autumn sowing should not be later than mid-August, otherwise it will reduce the overwintering rate of seedlings. 5. Sowing depth. According to different soil moisture and texture, dry soil should be deep, wet soil should be shallow, loam should be deep, and heavy clay should be shallow, generally 1 ~ 2.5 cm. 6. Sowing method. There are three common sowing methods of alfalfa: drilling, sowing and hole sowing. There are three sowing methods: unicast, mixed sowing and protective sowing (covering sowing). Can be selected according to the specific situation. Unicast, hole sowing or wide row drilling should be carried out in Dantian, the row spacing is 50 cm, the hole spacing is 50×70 cm or 50×50 cm or 50×60 cm, and each hole should be reserved with seedlings 1 ~ 2 plants. Grassland sowing can adopt drilling or sowing, unicast or mixed sowing or protective sowing. The row spacing of drilling holes is 30 cm. When sowing, shallow tillage should be done before sowing, and then harrow. Mixed sowing can adopt drilling, drilling in the same field or drilling between rows. In order to protect sowing, we should first drill or sow to protect crops, and then sow alfalfa ... >>

Question 6: How to grow alfalfa? There are many varieties of alfalfa, among which the protein content of alfalfa is high, and the annual output of fresh grass can reach 1 10,000 kg. Recommended planting.

1. Biological characteristics of alfalfa

Alfalfa is a perennial herb, and its hay yield ranks first among many leguminous grasses, and it is rich in protein, trace elements and more than ten vitamins. Alfalfa taproot is very long, generally 3-5 meters below the soil, and the deepest part can reach about 10 meters. The lateral roots are developed, the stems are mostly upright and smooth, and the height is 60- 100 cm. The leaves are composed of three lobules, obovate, with long and smooth petioles and large stipules. Purple flowers, racemes, kidney-shaped seeds, 1000-grain weight 1.5-2.5g, reach the peak of growth two or three years after sowing, and the life span can reach 10-20 years, or even 40 years.

It likes warm and semi-humid climate, is very drought-resistant, water-resistant and cold-resistant, and has no strict requirements on soil. Calcareous soil or sandy loam with pH value of 6.5-8.5 is the most suitable. In poor soil, appropriate manure and phosphate fertilizer should be applied as base fertilizer to promote the formation of nodules.

Alfalfa can be sown all year round.

Second, the planting method

1. Land selection: select neutral or slightly alkaline sandy loam with flat terrain, good drainage and deep soil layer. When the PH value is quite different, it should be manually adjusted to the appropriate PH value (pH 7-8).

2. Soil preparation: fully cultivate the grassland to a depth of 30cm, and break, level and furrow the soil to a depth of 20cm. Dig a drainage ditch around the site with a depth of 40 cm.

3. Seed treatment: add water to rhizobia according to the seed dosage of 1% to make bacterial liquid, sprinkle it on the seeds, add calcium, magnesium, phosphate fertilizer or fine dry soil, and stir evenly.

Step 4: Sowing.

Sowing date: Sowing can be done all year round.

Sowing amount:1-1.2kg/mu.

Sowing method: drill with soil moisture, soil moisture width 1.5m, row spacing of 20cm, sowing width of 5cm, 6 rows per soil moisture, and suppression after sowing.

5. Field management: fine management at seedling stage, manual weeding and intertillage weeding should be carried out immediately after each mowing.

6. Fertilization: 2000 kilograms of farmyard manure and 50 kilograms of calcium, magnesium and phosphorus are applied once per mu of base fertilizer. After irrigation, topdressing should be carried out after each mowing according to soil fertility.

7. Drainage and irrigation: irrigate immediately after sowing in sunny days, but water cannot overflow the soil surface, and irrigation can overflow the soil surface after seedling emergence. In rainy season, we should make full use of the drainage ditches around the soil and fields to avoid weak seedlings or dead seedlings.

8. Usage: about 40 days after sowing, carry out the first impurity removal and pruning, leaving stubble about 5 cm; When the grass grows to the early flowering stage, it is cut.

Question 7: How to grow alfalfa? (1) Alfalfa grass for land selection and land preparation has strong adaptability to soil, but it is best to choose neutral or slightly alkaline sandy loam or clay loam with deep soil layer and good drainage. Soil preparation is the key link of alfalfa planting. Alfalfa seeds are small, the soil strength at the top of buds is weak, the growth at seedling stage is slow, and the land is not flat, which is easy to cause lack of seedlings, broken strips and grass. Abandon farmland, break stubble and ridge in autumn, and then repeatedly suppress it, so that the soil is fine, the soil layer is solid and the water content is good, which is convenient for sowing. In order to prevent soil erosion of abandoned farmland or barren slopes, it is necessary to open up wasteland after spring and summer, and turn it over and rake it. In the early spring of the following year, the top slurry should be ridged to inhibit soil moisture. Mechanical flat sowing can be done without ridging, but the soil is required to be smooth and delicate. (2) Fertilized alfalfa is a kind of forage grass that likes fertilizer. Although it can grow on barren land, its yield is very low. Therefore, when planting alfalfa in barren land, applying some manure and phosphate fertilizer has a significant effect on improving grass yield. It is best to apply manure and phosphate fertilizer in combination with soil preparation. If it can be applied in stages, it should be applied after each mowing, which will play a greater role in promoting regeneration and improving grass yield. Topdressing is mainly nitrogen fertilizer, and thiamine can generally be topdressing 10 kg per mu. (3) Seeds and Sowing ① Due to the different natural conditions in different places, the sowing date of alfalfa is difficult to be consistent. In arid areas with thin soil layer, less rainfall and short frost-free period, sowing should be carried out in early spring, that is, from late March to early April, and not later than early June, otherwise it is not safe to overwinter. When irrigation conditions are available, it is best to sow in late April to early May. In areas where winter wheat is planted, alfalfa and winter wheat can be planted at the same time. Alfalfa weeds sown in autumn are harmless, but they can't benefit in that year. ② Sowing methods are mainly divided into three types: drill sowing, hole sowing and broadcast sowing. Drilling is divided into narrow-row drilling and wide-row drilling, and different methods are selected according to the cultivation purpose, sowing tools and terrain conditions. Narrow row drilling, mainly for grass production, mostly adopts mechanical sowing, and the general row spacing is 15~20 cm. This planting method has high yield, but low seed yield; Wide row sowing, generally using animal power sowing, spacing of 40~50 cm, mostly used in reserved land or arid areas; Hole sowing, this method is used when there are few seeds or for the purpose of harvesting seeds, so that each plant can fully develop, blossom and pod, and the seeds are full and the seed yield is high; Sowing is mainly used to artificially improve grasslands, gullies, floodplains and roads, and its sowing amount is generally 2-3 times larger than that of drilling wells. (3) The sowing amount is generally 0.75~ 1 kg per mu, and the forage harvester should be high and the seed harvester should be low. ④ The hard seed rate of alfalfa treated with seeds is about 10% ~ 20%, and the hard seed rate of newly harvested seeds is 25% ~ 65%, which can be greatly reduced after storage in autumn and winter, and gradually decreased with the storage years, and the seed germination ability can be maintained for more than 10 years. The seed coat cells of hard seeds are dense, impermeable, not easy to absorb water by direct seeding, and the germination rate is very low. Therefore, in addition to drying seeds, seed treatment should be carried out before sowing. The seeds are mixed with fine sand of about 1/6, and the sand is close to the size of the seeds. When they are ground on a grinder, the seed coat is scratched, which promotes the water absorption and germination of seeds. You can also soak the seeds in warm water, soak the seeds in warm water at 50℃~60℃ 15 ~ 16 minutes, and then dry and sow. ⑤ Sowing depth and soil covering. Proper sowing depth is the key to seedling protection. The sowing depth of general soil is 2~3 cm. Under dry conditions, deep ditch and shallow cover should be used. 0.5~ 1 cm is suitable for soil with insufficient water content and 0.3~0.5 cm for soil with suitable water content. Pay attention to the suppression of soil moisture conservation, and strive to sow and protect seedlings at one time. (4) Field management ① Alfalfa sown in that year is vulnerable to weeds because of its slow growth at seedling stage, so it is necessary to carry out intertillage weeding in time to prevent grass shortage. (2) Management and protection measures before overwintering. It is the main measure of overwintering protection to cultivate soil before winter to keep the roots and necks of plants in wet soil layer. The specific methods are shoveling in spring, beating in summer and ridging in late autumn. Pay attention to drainage in places with low terrain and accumulated water in spring. After two years, the field management of alfalfa is relatively simple. Before germination in early spring, the litter on the ground should be removed to improve the ground temperature, accelerate greening and promote growth. Irrigation and fertilization should also be carried out where conditions permit. In addition, weed and loosen the soil once after each harvest. ④ The main pests of alfalfa are aphid, leaf miner and blind stinkbug. Spraying 40% dimethoate emulsion 1000 times water can control aphids, spraying 40% dimethoate emulsion 3000~5000 times water can control liriomyza sativae, and spraying dichlorvos 1000~2000 times water can control blind stinkbug. Disease >>

Question 8: Do I have to cut 20 points when grazing, flowering, harvesting or collecting seedlings? It should be "alfalfa".

Alfalfa is a perennial plant with strong reproducibility. It can be mowed 3-4 times a year in the vigorous growth period, and the suitable mowing time should be when alfalfa110 blooms, when protein has the highest yield and good quality. Generally, stubble is about 5 cm each time. Cutting should be stopped about 50 days before winter, so that alfalfa can grow to a certain extent to facilitate overwintering. If you harvest seeds, you should reduce the number of mowing and harvest the seeds when most of the pods turn brown. Before harvesting, weeds such as dodder and sweet clover should be thoroughly eradicated to ensure seed quality.

1. It is suitable to start using green mowing when the plant height is 30 ~ 40 cm, pinch buds in early spring, and mow in tender stage will obviously reduce the yield. The suitable cutting period of hay is around the initial flowering period, and the utilization period of both should not be extended beyond the full flowering period.

2. The suitable seed collection time is when 1/2 ~ 2/3 pods on the plant change from green to yellow-brown. Harvesting grassland can't harvest seeds continuously. The field should also harvest grass once every 1 ~ 2 years.

3. In the utilization of alfalfa, seeds and grass products should be produced in a planned way according to the needs and planting area, and commodity management should be implemented.

4. The utilization life of forage harvest and seed harvest should depend on the maximum life of seed and forage production.

5. When alfalfa is used for grazing, pigs, chickens and horses are the most suitable livestock. Grazing ruminants are prone to abdominal distension, but it rarely happens after pod setting. Grassland used for grazing should be divided into different regions for rotational grazing, so as to maintain the vigorous vitality of alfalfa. Generally, grazing lasts for 4-5 days, and the recovery time is 35-40 days apart. For example, when grazing ruminants, the proportion of gramineous grasses in mixed grassland should account for more than 50%; Animals should be prevented from eating alfalfa when hungry, and forage such as oats and Sudan grass should be fed before grazing to prevent livestock diarrhea. In order to prevent swelling, procaine penicillin potassium salt can be taken orally before grazing, and the dosage of adult animals is 50 ~ 75 mg each time.

6. When alfalfa is used to prepare hay, it should be cut and dried once in sunny days to prevent rain, so as to avoid nutrient loss and reduce quality. Stacking and storage should be carried out in the way of flat drying combined with strapping and air drying. When conditions permit, move to a dark and ventilated place to dry in the shade when it is half dry. Hay must remain green. Qin Ying should check during storage to prevent losses caused by mildew. It is very effective to modulate by wrapping method (also called dyeing method). That is, in the wheat harvest season or alfalfa mowing and drying period, the cut fresh alfalfa is evenly spread between the upper and lower layers of dry wheat straw or other soft dry cereal straw used as feed, and repeatedly crushed with stones until the straw breaks. Can quickly dry fresh alfalfa. Avoid nutrient loss. Suction juice of alfalfa is sucked into straw, mixed and stored, mixed and crushed or fed after crushing. Not only improve that palatability of the straw, but also improves the nutritional value.

Question 9: Can flowering alfalfa rabbits eat it? Of course, purple flowers

Question 10: What are the key points of alfalfa cultivation? Seed culture method? Sow with seeds when planting, harvest alfalfa grass with some sickles or small mowers, and dry alfalfa grass and pile it up when storing.

Alfalfa sowing

1. seed. Seeds should be dried for 2 ~ 3 days before sowing to break dormancy and improve germination rate and seedling uniformity. Dantian should sow a class of seeds specified by the national or provincial forage seed standards; Sow first, second and third-grade seeds on the grassland.

2. Vaccinate. When sowing on the land where alfalfa has never been planted, alfalfa rhizobia should be inoculated, and each kilogram of seeds should be made into bacterial liquid with 5 grams of microbial agent, which should be sprinkled on the seeds, fully stirred and mixed for sowing. When the sterile agent is used, the soil in the old alfalfa field is mixed with the seeds at a ratio of at least1:1.

3. The sowing amount is 6.5-8kg per mu, grassland per hectare11.25-15kg, and the sowing amount in dry land, hillside or alpine region is increased by 20-50%.

4. sowing date. Because of the different climate in Gansu, it can be divided into three situations: spring sowing. After the land is thawed in spring, it should be sown at the same time as the spring crops. Spring-sown alfalfa developed well and had high yield. It was planted in Yichun, Tian. Summer broadcast. In arid areas, when the spring is dry and the soil moisture is poor, you can grab the moisture and sow after the rain in summer. Autumn sowing. In northern China, autumn sowing should not be later than mid-August, otherwise it will reduce the overwintering rate of seedlings.

5. Sowing depth. According to different soil moisture and texture, dry soil should be deep, wet soil should be shallow, loam should be deep, and heavy clay should be shallow, generally 1 ~ 2.5 cm.

6. Sowing method. There are three common sowing methods of alfalfa: drilling, sowing and hole sowing. There are three sowing methods: unicast, mixed sowing and protective sowing (covering sowing). Can be selected according to the specific situation. Unicast, hole sowing or wide row drilling should be carried out in Dantian, the row spacing is 50 cm, the hole spacing is 50×70 cm or 50×50 cm or 50×60 cm, and each hole should be reserved with seedlings 1 ~ 2 plants. Grassland sowing can adopt drilling or sowing, unicast or mixed sowing or protective sowing. The row spacing of drilling holes is 30 cm. When sowing, shallow tillage should be done before sowing, and then harrow. Mixed sowing can be sowing or drilling, point-to-point drilling or inter-row drilling. To protect sowing, first drill or sow to protect crops, then sow alfalfa seeds, and then rake the ground. In irrigation areas and areas with good water and fertilizer conditions, protective sowing can be used, and protective crops include wheat, rape or oats, grass sorghum, and millet. But protective crops should be harvested as soon as possible. When protective sowing is carried out in arid areas, not only the alfalfa yield in that year is not high, but also the harvest in the next year is affected, so it is best to carry out unicast in spring. Mixed sowing, alfalfa has fast growth, many tillers, rich branches and leaves, high yield, strong reproducibility and many mowing times, so it is difficult for other grasses to cooperate with mixed sowing, and unicast is more suitable. However, in order to improve the nutritional value, palatability and overwintering rate of forage, mixed sowing can also be used. The grass species suitable for mixed sowing are: chicken feet grass, green bristlegrass, perennial ryegrass, phoenix fern, Bromus inermis and so on. The suitable mixed sowing ratio of alfalfa is 40% ~ 50%.

operate

When sowing, if it is mixed with autumn sowing wheat or autumn sowing rape, it is not suitable to apply herbicides in the growth period after autumn and early spring. After the emergence of alfalfa, we should pay attention to prevent pests and weeds such as scarab, and apply pesticides to weeds in time. After harvesting wheat or rape, loosen the soil and clear the stubble, and spray 0.50% KH2PO4 when the seedlings are weak. Alfalfa in Longdong can only be harvested 1 year after sowing, and can be mowed two or three times a year. Pay attention to topdressing in the later stage, and apply 50 000kg/hm2 soil fertilizer on the surface every winter or before greening, and 300kg/hm2 calcium superphosphate during greening or after mowing every time, and then turn over the soil deeply. Alfalfa needs a lot of water, so it can be irrigated in winter or spring in areas with irrigation conditions, but it should be noted that it cannot be irrigated during the peak growth period, otherwise it will easily rot seedlings. Alfalfa is a perennial crop, which is easy to breed weeds, so intertillage weeding should be carried out in time. The yield and grass quality of alfalfa in Longdong were better at the initial flowering stage. If you don't plan to leave seeds for 1 crops, you should mow the grass at the right time during this period, usually around mid-July. Finally, 1 mowing should not be done too early. It is better to mow at the end of September when the leaves are wilting after the early frost. At this time, nutrients are transferred to the roots, which is conducive to the overwintering of perennial roots and the formation of lateral buds, which is the potential for high yield and branch reduction in the second year. The crown of alfalfa rhizome is the key part of regeneration bud germination. If you cut it off or cut it off, it will not only regenerate slowly, but also have fewer branches and lower vitality. Therefore, try to leave high stubble when harvesting. Don't mow the grass in rainy days to prevent the blade from flowing into the rain and causing the stubble to rot and die. In winter, in order to prevent the root cap from freezing and dying, the soil should be cultivated or covered with winter warm soil fertilizer before freezing.

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