Management techniques of soybean in the middle and later stage topdressing, drought resistance and control of diseases and insect pests

At present, the growth of soybean has entered the mature stage of grain filling, mainly in the period of reproductive growth, which requires more fertilizer and water, and it is also a period of high incidence of diseases and insect pests. Therefore, the following points should be done in field management:

Soybean management

1. Apply flower and pod fertilizer as appropriate. From flowering to grain filling stage, it is the peak period of fertilizer demand, and the de-fertilized plots with insufficient soybean fertility should pay close attention to the application of diammonium 15-20 kg per mu, and the effect of increasing yield is obvious.

2. Reasonable chemical control. If there is a trend of vigorous growth, 40-50 grams of 15% paclobutrazol and 50 kg of water per mu of soybean are sprayed on the leaves at the early flowering stage or 50 kg of water is sprayed with 15 ml of 25% zhuangsu water agent. If there is still a prosperous growth in the full flowering period, the prosperity can be controlled for the second time.

3. Resist drought and waterlogging. From early flowering to pod filling stage, soybean should be watered in time in case of drought, and drainage should be paid attention to in case of waterlogging to avoid aggravating the disease.

4. Spraying foliar fertilizer. In addition to nitrogen, phosphorus and potassium, boron, zinc and molybdenum are also indispensable to soybean. Therefore, the multi-element compound nutrient solution with the effect of increasing pods and grains and increasing yield was sprayed from flowering to grain filling stage of soybean. The method is as follows: 100 grams of potassium dihydrogen phosphate, 50 grams of zinc phosphate, 50 grams of borax (dissolved in hot water first) and 25 grams of ammonium molybdate per mu, stirring fully, adding 50 kilograms of water, spraying evenly on the front and back sides of soybean leaves, spraying 2 times for 3 times.

5. prevention and control of diseases and insect pests.

The main control of soybean pests: 1, soybean heart-eating insects were sprayed with 2.5% deltamethrin EC 1500-2000 times; 2, bean moths were sprayed with 20% fenvalerate EC 2500-3000 times; 3, pod borer was sprayed with 1000-0500 times fenitrothion EC.

The main control of soybean diseases: grey leaf spot, spray with 500-600 times of 70% methyl thiophanate wettable powder or 500 times of 50% thiophanate wettable powder.