The management of summer soybean in the middle and later period of growing soybean

Compared with corn and cotton, soybean has less labor, less investment and low cost during the growth period, which is a major advantage of summer soybean crops, but the middle and later stage management is the key to obtain high yield of soybean.

The flowering and podding stage, in which vegetative growth and reproductive growth go hand in hand, is the key period to determine the number of pods per plant. After flowering, soybean growth enters a vigorous period, and vegetative growth gradually reaches a peak. The nitrogen fixation ability of rhizobacteria also increased gradually from the early flowering stage to the podding stage reached or close to the peak, during this period the amount of nitrogen fixation supplied to the part above the ground of soybean, the flowering and podding stage was the period when soybean needed the most fertilizer and water, and sufficient fertilizer and water, strong light and sufficient carbon dioxide were beneficial to promote the flowering and fruiting of soybean.

The yield of soybean depends on the number of pods of soybean, so in production management, soybean plants are required to have luxuriant leaves, deep roots and strong stems in order to achieve the goal of obtaining high yield with multiple pods.

Drought at flowering and pod stage has a great influence on the number of pods of soybean, so it must be irrigated in time, and waterlogging should be paid attention to on rainy days. At the same time, protective measures should be determined according to the growth and appearance of the plant. If the plant is too prosperous, it can be controlled by deep ploughing or spraying. If the plant is weak, it should be combined with ploughing and watering, and it is best to apply compound fertilizer, 5kg / mu.

78 soybeans are easy to be harmed by pests, so we should always observe whether there are insect pests and control them in time. Bridge insects and bean insects are frequent and destructive pests, and they do serious harm from late July to early August. Pyrethroids pesticides can be used to control bridge insects and bean insects. Soybean stalk black miner and bean stalk fly are also two noteworthy soybean pests, and phoxim or pyrethroid pesticides can also be used to control them.

In the period of grain maturity, the vegetative growth stopped, the reproductive growth was exuberant, and the ability of nitrogen fixation decreased rapidly. during this period, the number of seeds per pod was determined in the early stage, and the grain weight was determined in the middle stage.

The main goal of the grain maturity stage is to protect leaves, roots, and increase the number of pods. The grain filling stage, especially at the early stage, is sensitive to water, and at this time it gradually enters the dry season, so it is necessary to water some plots in case of drought, and foliar fertilization should be carried out on some plots. Spray 1%-2% urea or 2%-3% superphosphate solution, the time should be after 3 pm.

The main pests in grain mature stage are heart borer and cotton bollworm, which can be controlled by phoxim, dioxin and other insecticides.