Soybean growth and development characteristics and management objectives: About 25 days after sowing, summer soybeans entered the branching stage, which is a turning point in the transition from vegetative growth to reproductive growth of soybeans. It takes about 20 days from the beginning of branching to flowering. During this period, the growth of soybeans began to flourish, and flower buds began to differentiate. Root nodules had nitrogen functions. Branching period is a crucial period to determine whether the plant is robust or not, branching and flowering in the whole growth period, and it is closely related to the level of yield. For this reason, the main objective of the field in the branching period is to promote the robust growth of plants on the basis of whole seedlings and seedlings, not to grow in size, to achieve strong growth, multiple branches, and multiple flower bud differentiation purposes, and to achieve multiple flowering and multiple knots. Beat the basics. According to the current situation of soybean in our city, we must grasp the following key technologies.
1. In the soybean field at the seedling stage, seedlings are still to be checked and planted to ensure seedling growth. The lack of seedlings and ridges is the most prominent issue in the production of soybeans, and it is also one of the major factors in improving production. For lack of seedlings more than 30 cm. Immediately after the emergence of soybeans, seedlings are planted and planted as soon as possible. The sooner the better, the two plants with 30 cm below the seedlings can remain.
2, rational close planting, scientific Dingmiao. "The lack of thick beans and deficiencies," "Miao savage is better than grass shortage," which is the experience of farmers themselves, the rational close planting can increase production by 15 to 30%. Demonstration variety Zheng 9525 soybean varieties suitable density is 1.2 14,000 / acre, if the 6-inch spacing, Liu Miao spacing from 7 inches; if the two ridge by (9 inches ? 6 inches wide and narrow line), Liu Miao 4.5--5 inches If the 1.2-foot row spacing 4 inches. Other species can be left as seedlings according to their requirements.
3, scientific fertilizer, increase production. Increasing fertilization is a guarantee of high soybean yield. Soybeans need more crops, and they are not only of many types but also of large quantities. For each 100 kg of soybean produced, 6.27 to 9.45 kg of nitrogen, 1.42 to 2.6 kg of phosphorus pentoxide, and 2.08 to 4.9 kg of potassium oxide are extracted from the soil. Rhizobia-fixed nitrogen can provide 1/2?2/3 of the amount of nitrogen needed by soybeans for a lifetime, so soybeans need high yields, and fertilization is the key. The best period for soybean fertilization is from branching to early flowering (mid-to-late July). Fertilizer type and quantity: Diammonium or soybean special fertilizer, 15-20 kg per mu. Fertilization method: deep application. Single leg can be used to avoid spreading.
4, cultivating loose soil, soil. Soybeans like to live on earth, afraid of rigid ground, so we must cultivator, soil cultivation.
5, drought and flood control.
6, comprehensive prevention and control of diseases, insects, weeds.
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