Management of soybean flower pod stage

The flowering and pod stage of soybean requires that the stem of the plant is stout, the leaves are thick green and thick, and there are no spots. Field management is mainly to prevent premature senescence, control overgrowth, protect flowers and increase pods, and prevent shedding.

I. skillful application of flower fertilizer

The flowering and podding period is the period when soybean absorbs the most fertilizer, and the skillful application of flowering fertilizer can generally increase the yield by more than 15%. Soybean early florescence generally every 667 square meters urea 5-10 kg, poor growth should be more, strong and luxuriant, should be less or not to chase. With the application of nitrogen fertilizer at flowering stage, phosphorus, potassium fertilizer, boron, molybdenum and other micro-fertilizers were sprayed on the leaves. Generally spray twice, every 667 square meters with 100 grams of potassium dihydrogen phosphate, 25 grams of ammonium molybdate, 100 grams of borax (first dissolved in a small amount of warm hot water), add 50 kilograms of water to spray evenly on the stems and leaves of the plant.

Second, drought resistance and drainage

Soybean needs a lot of water at flowering and pod stage. Particularly sensitive to water, easy to drop flowers and pods in case of drought. Therefore, in the case of drought, if the leaves are found to wilt at noon, they should be irrigated in time to fight drought. However, do not flood irrigation, otherwise it is easy to make the root system suffocate rot, soil consolidation, cause cracking when dry, damage the root system, small ditch irrigation is better, make the soil moist. Soybean has poor waterlogging tolerance and is afraid of waterlogging damage. When there are more Rain Water in the flowering and pod period, attention should be paid to timely ditching and drainage.

III. Spraying hormone

1. Paclobutrazol

Paclobutrazol can control plant height, shorten Internode length, increase stem diameter, prevent lodging, increase branch number and pod number per plant, increase seed setting rate and grain weight, promote the formation of top pod, and generally increase yield by more than 12%. It should be sprayed about 7 days after the first flowering, and the ones with good growth should be applied before the first flowering. 50-100 grams of paclobutrazol wettable powder with 15% paclobutrazol per 667 square meters, diluted with 50 kg of water, and then evenly sprayed on both sides of the leaves. The varieties with infinite podding concentration can be higher, the varieties with limited pods should be lower, the fields with poor growth should be higher, and those with good growth should be lower.

two。 Sodium Bisulfite

It is a kind of photorespiration inhibitor, which applies or reduces the nutrient consumption of photorespiration on soybean, improves the plant type, promotes the growth of soybean root system and increases the number of rhizobia, has a good effect of flower and pod protection, and increases the yield by more than 10%. Application method: spray once in the early flowering stage and full flowering stage, each time with 10 grams of sodium bisulfite per 667 square meters, diluted with 75 kilograms of water, and choose to spray leaves when the sun is not too strong in the afternoon. Can also choose photosynthetic micro-fertilizer (100 grams per 667 square meters) plus potassium dihydrogen phosphate mixed spray.