Rape double-during period pay attention to fertilization

"Liu webmaster, you look at these fields of rapeseed Can also dressing?" January 9, Nanjiang South Town in Pa village party branch secretary Heguang Xuan, the county Bureau of Agriculture agronomist, agricultural station Liu Xingcheng asked questions and there were more than 10 villagers present . Liu Xingcheng immediately explained: Now, rapeseed has gradually entered the stage of buds and convulsions. The buds are convulsing to flowering, which is a period of vigorous growth of vegetative growth and reproductive growth. This period is called Shuangwang period. The main target of this stage is spring. It is stable and long, promotes thick stems, maintains a large number of green leaves, and lays a solid foundation for high yield. The rapeseed has a large amount of fertilizer, which accounts for about half of the total amount of life. During this period, it is reasonable to topdress and can receive the effects of strong, increased branches, flowers, pods and seeds. The specific method is

 

Stabilize the application of nitrogen fertilizer. In spring, the amount of nitrogen fertilizer should be strictly controlled according to the previous fertilization situation. For weak seedlings, it is necessary to apply early and reapply quick-acting nitrogen fertilizer. After the "Spring", it will be applied after 5 hours - 6 kg of urea , so that the supply of nutrients is consistent with the convulsions, and weakened to strong; Shi light application, when the height is 10 cm, the application of urea 3 kg - 4 kg, in order to prevent the lack of stamina, affecting the results of strong seeds; for Wang Miao generally do not pursue quick-acting fertilizer, only 1000 kg - 1500 kg Farmyard manure to prevent de-fertilization from affecting pod growth. The fertilizer application should be stable, and the general fertilizer is sufficient. Because of the low temperature in winter, the land can play a small role. The manure can be applied without the application of less or less, and will gradually exert the fertilizer effect as the temperature rises.

 

Increase the application of potassium fertilizer. Shuangwang period is the peak period of potassium absorption in rapeseed. When the potassium is insufficient in the early stage, it should be added in the flood season to improve the resistance of the plant, improve the resistance of rapeseed to lodging, resist pests and diseases, and coordinate rapeseed. Growth, increase yield and quality. Generally, 5 kg of potassium chloride - 7.5 kg per mu or 75 kg of grass ash - 100 kg, potassium deficiency soil and paddy rape should be increased. The time of application is generally in the middle and late February .

 

Apply phosphate fertilizer. Phosphate fertilizer should be applied in the form of root-dressing and topdressing. After every 1 mu of calcium phosphate, 1 kg - 1.5 kg and 50 kg of water are soaked for one day and night, the filter residue is taken for spraying. Generally sprayed twice, with an interval of five days --7 days.

 

Spray boron fertilizer. In the rape flower bud period, spraying the boron fertilizer solution on the leaf surface can prevent the occurrence of "flowers and unreal" and secondary flowers, and has a significant yield increasing effect. It is advisable to spray one time each time in the flood season and the initial flowering stage. Each time, 100 grams of borax can be used per acre , and 50 kilograms to 75 kilograms of water sprayed on the front and back of the spray blade. Borax is generally not easily soluble in water. When preparing a boron fertilizer solution, the borax should be firstly decomposed with a small amount of warm water of 60 °C - 70 °C, and the required amount of water should be added. After the borax solution is properly prepared, it should be sprayed immediately to avoid re-crystallization and precipitation of boron and reduce the effect of spraying boron.

 

Spray growth regulators. Wang Miao has leaf draping and soft tissue, which will reduce production due to overnutrition and reduced resistance. Therefore, the chemical control of the seedlings must be carried out. In the pumping period, 50 grams of 15% paclobutrazol can be used in the mu , and 75 kilograms of water can be sprayed with water to control the height and increase the thickness, and the control will turn into a high-yield field.

 

In addition, when the speed of leafy rape leaves is fast, in order to slow down the leaf speed and control the growth, it is also possible to spray a 0.5% chlormequat solution once .