Soybean pods require plant stems thick, thick green leaves, no spots. Field management is mainly to prevent premature senility, control leggy, increase flowering, and prevent loss. The main measures:
(a) Qiao Shi Hua Fei. Flowering and poding period is the period when the soybeans have absorbed the most fertilizers. However, flowering fertilizers can generally increase production by more than 15%. The initial flowering period of soybean is generally 5-10 kilograms of urea per mu. Strong and vigorous growth, should be less chase or not chase, with flowering nitrogen fertilizer, foliar spray phosphorus, potassium nutrition and boron, molybdenum and other trace fertilizer. General spray two times, each time with 100 grams of potassium dihydrogen phosphate per acre, ammonium molybdate 25 grams, 100 grams of borax (first dissolved in a small amount of warm water), together with 50 kg of water spray evenly on the plant stems and leaves.
(b) Anti-early drainage. Soybeans require large amounts of water during flowering. Particularly sensitive to moisture, easy to fall in the event of drought. Therefore, under drought conditions, if the leaves are found to have wilted at noon, they should be flooded and drought-resistant. But do not flood flooding, otherwise easy to make the root suffocation rot, soil compaction, cracks caused by dry, damage the roots, irrigation with a small ditch is good, so that the soil can be moist. Soybeans have poor stain resistance and are resistant to waterlogging. When there is a lot of rain during the flowering season, attention should be paid to clearing the trenches in time.
(c) spraying hormones.
1, paclobutrazol. Controlling plant height, shortening internode length, increasing stem diameter, preventing lodging, increasing the number of branches and grains per plant, increasing seed setting rate and grain weight, and promoting the formation of crest, generally increasing the yield by more than 12% . Spraying about 7 days after flowering, good growth should be applied early before flowering. Use 15% paclobutrazol wettable powder 50-100 grams per acre, add 50 kg water and dilute it evenly to spray the positive and negative sides of the leaves. Spraying with an unlimited concentration of clams can be higher, and limited clams should be lower; growing fields should be higher, and growth should be lower.
2, sodium bisulfite. It is a kind of photorespiration inhibitor, which can reduce the consumption of nutrients by photorespiration on soybeans, improve the plant type, promote the growth of soybean roots, increase the number of rhizobial bacteria, and ensure good flowering and protection effects. The yield increase is more than 10%. Application method: spray once at the early flowering stage and full flowering stage, and use 10 g of sodium bisulfite per acre and dilute with 75 kg of water. Select to spray the leaves when the sunlight is not strong in the afternoon. Can also use photosynthetic fertilizer (100 grams per acre) plus potassium dihydrogen phosphate mixed spray.
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