Field Management Techniques of Rape in Spring
Recently, the snow or haze in the northern regions has occurred frequently, which has had a negative impact on the production of vegetables in the facilities. In order to effectively deal with such unfavorable weather, the guidance group of the vegetable experts of the Ministry of Agriculture specially formulated the technical guidance on the production and management of vegetables in cloudy or haze weather facilities.
First, the characteristics of rapeseed after spring
The first is that rape grows faster after spring. After the beginning of spring, as the temperature rises, the rapeseed has been flowering and the vegetative growth and reproductive growth have become more and more prosperous. It is necessary to quickly grow leaves and branches, but also to draw a large number of moss branches, and continue to form a large number of buds. From mid-February to mid-March, the number of green leaves of the main stalk of rape increased 1-2 times from the previous year, and the leaf area expanded 3-4 times. The dry matter accumulation accounts for more than 20% of the entire growth period, and it accounts for 80%-90% of the mature period.
The second is that rapeseed nutrient absorption after spring. The farmer said: "The old rape comes rich." In the period of about one month after the spring palliative period, the amount of nitrogen required is about 45% of the growth period, the amount of phosphorus required is about 20%, and the amount of potassium needed is 40%. The nitrogen content in the plant was 3.6% in the seedling stage and 4.3% in the stalk period; the phosphorus-containing seedlings and the stalk period were between 0.57% and 0.79% with little variation; the potassium-containing stalk period was 3.2%, and other periods were 1.6%-2.6%. The daily absorption of nitrogen, phosphorus, and potassium at different periods was 1.70, 1.00, and 2.26 mg/plant per year, respectively, and 7.56, 1.54, and 8.47 mg respectively. The total nutrient accumulation of plant plants accounted for a total lifetime accumulation of 31.9% and 44.5% of nitrogen, and 29.4% and 49.5% of phosphorus, and 36.1% of potassium respectively. And 45.3%. The nitrogen, phosphorus, and potassium absorbed by one gram of dry matter accumulated in the plant were also higher during bolting to the initial flowering stage. These all reflect the characteristics of rich rape after spring.
Second, rape after spring management technology
The first is to apply the moss. The amount of moss fertilizer depends on the specific circumstances, generally at the end of the foot fat, seedlings, seedlings and color are better to be stable, on the contrary, to apply more than adequate, so that fat hair enough hair good. Its application rate can account for 15%-25% of the total fertilizer, and generally 5 kilos of urea.
The second is irrigation drainage. During the growing period, the florescence increased, the leaf area increased, the physiological activity increased, the temperature increased gradually, the transpiration increased, and the daily water consumption intensity also increased. The flowering period grew most vigorously, the temperature continued to rise, and the water consumption intensity was also large. It is necessary to timely irrigation and clean up the “three ditch†to maintain the ditch and ditches, to facilitate drainage, to prevent rain stains, to make strong roots, and prevent disease from falling down.
The third is prevention and treatment of diseases. Saccharomyces cerevisiae is particularly serious in high-yield and high-yielding fields, with a low incidence of 10%-20% and a loss of 1-2% of yield; the incidence is more than 80%, and more than half of the yield is lost. Sclerotial sclerotia should take the key prevention and control, and it is generally better to fight drugs twice at the flowering stage. The combination of chemical control and removal of old yellow leaf method has a good control effect.
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