How many times a year is rice harvested in the South, with planting methods included?

How many times a year can be harvested in Southern rice usually depends on the planting area. For example, when rice is grown in Hainan, it can generally be harvested three times a year, while when rice is grown in Guangzhou, it can generally be harvested twice a year. . When harvesting rice, it cannot be harvested on rainy days. It needs to be harvested when the weather is sunny. After harvesting, it should be threshed in time. It is not suitable to pile up because the rice pile will emit heat, resulting in yellow rice and moldy rice.

1. How many times a year can southern rice be harvested?

1. Harvesting times

How many times a year can be harvested in southern rice generally depends on the area where it is grown. For example, rice in Guangzhou generally has a double-cropping system per year and can usually be harvested twice, while rice in Hainan generally has a triple-cropping system per year and can usually be harvested three times.

2. Points to note when harvesting

(1) Generally, rice can be harvested when the weather is fine. It needs to be threshed in time after harvesting. It is not suitable to pile up to avoid piles of rice causing heat. Yellow rice, moldy rice.

(2) It should be noted that it is not advisable to harvest rice on rainy days. If you accidentally get caught in the rain during harvesting, you need to shake off the rainwater first, then spread the rice and blow it with a fan. Blow away the rainwater, and generally do not stack rice that has been exposed to rain to avoid causing the rice to germinate and become moldy.

2. Rice planting methods in the South

1. Planting time

(1) Generally, rice in the South can be divided into early rice and mid-season rice based on planting time. and late rice.

(2) Early rice can generally be sown in March-April, mid-season rice can generally be sown in April-May, and late rice can generally be sown in mid-to-late June.

2. Seed selection

(1) It is necessary to select rice varieties with high quality, high yield, strong stress resistance and suitable maturity period based on the planting conditions of various places.

(2) Sun-dry the seeds first, and then soak the seeds to accelerate germination. The seeds must also be soaked with medicinal water to prevent the rice seeds from being attacked by diseases and insect pests.

3. Sowing

(1) Generally, sowing needs to be done when the temperature is greater than 12°C to ensure that rice seeds can grow normally.

(2) Sow rice seeds evenly and cover them with nutritious fine soil. The thickness of the fine soil is generally 0.5-1cm and spread with mulch film.

4. Seedling management

(1) For land where mulch is used for insulation and seedling cultivation, timely ventilation is required. When encountering sustained high temperature weather and the temperature inside the film exceeds 35°C, it is necessary to remove the film and ventilate it in time to prevent seedlings from burning.

(2) In sunny weather after rain, it is generally not advisable to remove the film suddenly to avoid the rice seedlings not adapting and affecting their growth. Usually, you can ventilate and harden the seedlings first, then remove the film, and you also need to sprinkle water appropriately.

(3) When the rice reaches the 1-leaf and 1-heart stage, it is necessary to provide appropriate temperature and pay attention to moisturizing. The purpose is to cultivate strong seedlings and avoid excessive growth. When the 2-leaf and 1-heart stage is reached, you need to pay attention to ventilation and tempering the seedlings, and apply an appropriate amount of fertilizer to promote tillering of the rice and cultivate strong seedlings.

(4) When the rice reaches the 3-leaf and 1-heart stage, the mulch film needs to be uncovered during the day and then tightly covered with mulch film at night.

(5) A small amount of fertilizer can be applied 5-7 days before transplanting. Usually 4-5kg of urea can be applied per acre. It can also be applied 5-7 days before transplanting. Apply wedding fertilizer and add water once. It should be noted that weakly growing seedlings need to be combined with phosphate fertilizer and potassium fertilizer to promote better growth.

5. Transplanting at the appropriate time

(1) Planting area for machine-transplanted rice seedlings

① For planting areas for machine-transplanted rice seedlings, the soil needs to be removed before transplanting The purpose of sinking is to improve the quality of farming.

② You can choose a rice transplanter with a row spacing of 25cm and achieve early and shallow transplantation. At the same time, the planting density should be appropriately increased. Usually more than 20,000 holes can be planted per acre, and the seedling age is about 20 days. The purpose is to avoid premature earing due to too long seedling age.

(2) Planting areas for manual transplanting or throwing out seedlings

① For planting areas for manual transplanting or throwing out seedlings, the planting density and uniformity must be ensured. The age of seedlings is usually About 25-30 days.

② For high-yielding fields, generally 25,000-25,000 holes can be planted per mu. For 3-crop planting fields, it is necessary to increase the planting density of conventional seedlings appropriately. More than 25,000 holes per mu should be planted, and the age of the seedlings Usually it cannot exceed 30 days.

6. Fertilization management

(1) Applying tillering fertilizer early can generally promote low tillering. Usually, 4-5kg urea can be applied per mu within 5-7 days after planting. When applying ear fertilizer, it is generally necessary to determine the amount of nitrogen and potash fertilizers based on the growth of rice

(2) Apply flower-promoting fertilizer about 30 days before heading, and apply flower-protecting fertilizer about 15 days before heading. Usually, 3-5kg of urea + 3-5kg of potassium fertilizer can be applied per acre.

(3) Grain fertilizer should be applied according to the color of the rice leaves at the heading stage. If the leaves turn light green, appropriate supplementation of grain fertilizer is required according to the seedling condition.

7. Water management

(1) During the greening period of rice, it is generally necessary to maintain the water layer in the field at 2-3cm to promote early development of new roots.

(2) During the tillering stage of rice, it is generally necessary to keep the water layer at 1.5-2cm. It should be noted that for machine-transplanted planting fields and seedling-throwing planting fields with a large number of basic seedlings, drying and seedling control should be carried out appropriately in advance on the basis of early onset.

(3) During the differentiation stage of young panicles, the water layer in the field should be about 3-5cm. It should be noted that if there is high temperature weather during the heading period, a water layer of about 5cm needs to be irrigated to alleviate heat damage and ensure that the rice can grow normally.

(4) The intermittent irrigation method needs to be used after the rice heads and blooms. After entering the wax maturity stage, the alternating dry and wet irrigation method needs to be used. Before harvesting, the water needs to be cut off 5-7 days in advance.