Will the rapeseed flowers bloom in Wuyuan on March 12?

The main flowering period of rapeseed flowers in Wuyuan is predicted as follows: from March 5th to 11th, the rapeseed flowers bloom from sporadically to slowly entering the early blooming period; from March 12th to 17th, the rapeseed flowers in Wuyuan slowly transition to the early blooming period. During the period, from March 18th to April 5th (Qingming Festival), the rapeseed flowers are in their peak flowering period, and most of the rapeseed flowers come to an end before April 8th-15th. Jiangling is one of the four largest flower seas in China, with a sea of ??10,000 acres of terraced rapeseed fields, a world-class photography base, and a condensed version of Wuyuan. It is also recognized by the public as the most visually striking rapeseed flower viewing spot in East China.

This was taken last year when I went there

Cultivation technology of rapeseed - scientific fertilization. Rapeseed has a strong ability to absorb fertilizer, but more nutrients are returned to the field. More than 80% of the nutrients absorbed come from fallen leaves. , fallen flowers, stubble and cakes are returned to the fields. In terms of nutrition and physiology, high-quality rapeseed has the characteristics of large demand for nitrogen and potassium and sensitivity to phosphorus and boron. According to measurements, rapeseed yields 100-150kg per mu, and each 100 rapeseeds need to absorb 9-11kg of nitrogen, 3-3.9kg of phosphorus and 8.5-12.8kg of potassium. (Treem) The ratio of nitrogen, phosphorus and potassium is 1:0.5:1.

Nutritional requirements

① Nitrogen demand. Nitrogen is a component of protein, chlorophyll and many important organic compounds in rapeseed plant organs, and is very important in physiological metabolism. Nitrogen deficiency causes short plants, pale leaves that turn red and scorched, slender stems, small branches, underdeveloped root systems, slow and few flower bud differentiation, few buds, poorly developed horns and grains, and low yields. The amount of nitrogen has a certain impact on the quality of rapeseed. Excessive nitrogen supply during the silique maturity period will increase the protein content in rapeseed and reduce the oil content. At the same time, the erucic acid, linolenic acid, and linoleic acid contents in the oil increased slightly, while the glucosinolate content in the seeds decreased.

②Demand for phosphorus. Rapeseed requires less phosphorus than nitrogen, but high-quality rape is sensitive to phosphorus. Scientific fertilization Phosphorus is very important in the physiological metabolism of rapeseed. Phosphorus is a component of nuclear proteins, phospholipids, nucleic acids and active enzymes, and determines the proliferation, growth and development of cells. When phosphorus is lacking, the root system of rapeseed plants is significantly reduced and the absorption capacity is weak; the development of leaves, branches and flower bud differentiation are blocked, photosynthesis is weakened, the number of siliques and siliques is small, and the yield is low. In the northern winter rapeseed area, sufficient phosphorus supply can also increase the soluble sugar content in the nutritional body of rapeseed, increase the concentration of cell fluid, enhance the elasticity of the cell wall and the viscosity of the origin, reduce the transpiration of intercellular water, and improve the ability of rapeseed to survive the cold.

③Demand for potassium. Potassium participates in the metabolism and operation of carbohydrates in the body in its ionized state. When potassium is lacking, plant growth is retarded and the tips of the lower leaves are scorched; the stems are thin and easy to fall, the branches are small, and the thousand-grain weight is low.

④Demand for boron and other trace elements. Rapeseed requires more trace elements, but the element that has a greater impact on growth and development is boron, followed by molybdenum, manganese, zinc and other elements.

Boron is not a component of organic matter in rapeseed plants, but it plays an important role in the physiological metabolism of rapeseed. It can enhance the drought resistance, cold resistance and disease resistance of rapeseed, enhance the photosynthesis of rapeseed stems and leaves and other organs, and promote the normal operation of carbohydrates. When the supply of boron is sufficient, growth and development will be strong, vitality will be strong, root systems will be developed, branches and leaves will be luxuriant, siliques will be full and the seeds will be plump. When the content of soluble boron in the soil is less than 0.4 mg/kg, rapeseed will have many symptoms such as plant dwarfing, shrinking growth, and unreal flowers. When soil boron deficiency is particularly severe, seedlings will have cracked petioles, cracked roots and necks, purple spots on the leaves, chlorosis and whitening, and even a large number of deaths. Although other nutrients are sufficient, the above symptoms cannot be eliminated. Premium canola and hybrid canola are more sensitive to boron.

The reasons causing boron deficiency in rapeseed: First, the loss of soil boron. Soil with a lighter texture has poor water and fertilizer retention properties and a large amount of soluble boron is lost. Second, calcareous soil is generally deficient in boron. The content of available boron in acidic soils with a pH value in the range of 4.7 to 6.7 is higher; the content of available boron in alkaline soils with a pH value in the range of 7.8 to 8.1 decreases. The third reason is that the ratio of various nutrients in rapeseed is imbalanced. For example, partial application of nitrogen fertilizer and potassium fertilizer will cause potassium and boron antagonism and lead to boron deficiency. Fourth, late-maturing varieties have a long growth period and are more prone to boron deficiency than early-maturing varieties.

The yield-increasing effect of applying boron fertilizer is mainly related to the soluble boron content of the soil. The lower the soil boron content, the more obvious the yield-increasing effect. For example, the results of the soil survey in Henan Province indicate that soil boron content above 1 mg/kg is a boron-rich area, between 0.5 and 1 mg/kg is a boron-suitable area, between 0.2 and 0.5 mg/kg is a boron-deficient area, and between 0 and 0.5 mg/kg is a boron-deficient area. ．Below 2mg/kg is a serious boron deficiency area, and the available boron content in most soils in this province is below the critical boron requirement for rapeseed. The soluble boron content of fluvo-soil is 0.31 mg/kg, cinnamon soil is 0.22 mg/kg, sand ginger black soil, brown soil, and wind-sand soil are all 0.2 mg/kg. Yellow-brown soil has the lowest water-soluble boron content, only 0. 17mg/kg. Therefore, most soil fertilization has a significant yield-increasing effect on rapeseed.

Trace elements molybdenum, manganese, copper, zinc, etc. all play an important role in the growth and development of rapeseed. Such as promoting photosynthesis, accelerating metabolism, enhancing drought and cold resistance, etc. Therefore, applying corresponding micro-fertilizers to soil lacking these elements can have a good effect on increasing yields.