How to fertilize rape scientifically? Can I use the technique of topdressing on snow?

Rapeseed is a kind of oil crop, which is widely planted in our country. Its moss can also be used to eat, taste crisp, eat up a unique taste. In addition, there are some places in our country that attract tourists to take photos and watch by planting large rape fields. How to apply fertilizer scientifically in the process of rape cultivation? Can we use snow topdressing technology?

How does rape fertilize scientifically?

1. Fertilize according to the field

Rape fertilization is different, in order to high yield, then in the above fertilization level to increase 15%-20%. Specific fertilizer application amount can be applied according to soil quality, soil fertility, seedling situation, is all base fertilizer, application amount, etc., fertilizer supply can be carried out according to field conditions. The specific dosage can be accurately applied fertilizer and fertilizer according to the demand law of each nutrient above.

2. Fertilization time

Rape is a nutrient accumulation crop in early stage, although the demand for phosphorus is less than the amount of nitrogen and potassium fertilizer, it is very sensitive. If phosphorus is deficient in late stage, it will have a great impact on rape nutrition, growth and yield. Therefore, the fertilization strategy of direct seeding winter rape is to promote first and stabilize later, that is, 70% nitrogen fertilizer, all phosphorus fertilizer, potassium fertilizer and boron fertilizer are used as base fertilizer or seedling fertilizer, and the remaining 30% nitrogen fertilizer is applied in moss fertilizer.

Bolting flowering period is the most efficient period of rape nutrition, the proportion of fertilizer required in the life is the largest, therefore, bolting to flowering period must be timely topdressing, so that the bud period of flowering fertilizer.

3. Fertilization method

Rapeseed topdressing is as important as base fertilizer, so it is necessary to pay attention to balanced fertilization. In order to make strong seedlings, urea 3-5 kg is applied to rape fields below 5 leaves to promote the growth of rape seedlings. In addition, attention should be paid to supplementary application of boron, phosphorus and potassium fertilizer. 1-1.5 kg boron fertilizer shall be applied to the fields without boron fertilizer, 5-8 kg potassium chloride or 20-25 kg phosphorus fertilizer shall be applied to the fields without phosphorus and potassium fertilizer, or 10-15 kg ternary compound fertilizer shall be applied.

When rape flower bud differentiation, it is necessary to apply fertilizer, at this time, quick-acting nitrogen fertilizer is mainly applied, urea 5-7 kg can be applied per mu; urea 5-8 kg per mu, ammonium phosphate 2.5-5 kg, or ternary compound fertilizer 15-20 kg; rape flowering topdressing can be sprayed on leaves, 0.1%-0.2% urea or 0.2% potassium dihydrogen phosphate solution 50 kg per mu in flowering and pod setting period, and boron fertilizer should be sprayed 1-2 times before flowering. Of course, the amount of topdressing in different fields should be adjusted according to seedlings.

Second, winter rape can use snow topdressing technology?

Snow topdressing technology is to use winter snowfall to topdressing winter rape, winter wheat and other crops planted in dry land, especially in fields with poor soil fertility and weak seedling condition before winter.

Specific methods: When the snowfall reaches about 10 cm, evenly spread non-volatile instant nitrogen fertilizer (such as urea) on the snow, generally apply urea 7.5~10 kg per mu, and increase the dosage appropriately for fields with poor soil fertility conditions. Farmers can also sprinkle fertilizer into the field before snowfall according to the weather forecast, and cover it with fertilizer after snowfall so that it melts into the soil together with snow.

Note: too little snowfall, fertilizer is difficult to completely melt, can not achieve the expected effect, resulting in fertilizer loss.

Function: After the winter crops return to green in spring, with the increase of temperature, the growth speed is accelerated, the nutritional growth and reproductive growth of some crops are carried out at the same time, and the requirements for water and fertilizer are very high. Fertilization on snow in winter achieves winter fertilizer and spring use, solves the phenomenon of spring defertilization of fields with poor soil fertility, promotes the transformation and upgrading of seedling conditions, and lays the foundation for high yield.