The initial flowering period of soybeans, the best period of control!
As the saying goes: "The first flowering period of soybeans, see the management of flowers." At present, many soybeans in the field have gradually entered the initial flowering period. The initial flowering period is a critical period for soybean growth, so it must be managed in this period, especially in the early flowering period, which is the key period to control the growth of soybeans.
Soybean is a legume crop. In the process of growth, it is often caused by improper fertilization, or excessive water, high temperature and high humidity, etc., causing the plant to grow and become serious, leading to falling flowers and pods, affecting yield.
The field performance of common soybeans is as follows:
1. The foliage is luxuriant, the ventilation and light transmission are poor, and the blades are completely sealed;
2, the upper leaves are thick, the color is dark green, the leaf size is close to the palm of the adult; the lower leaves are yellowed and begin to fall off;
3. In addition to a small number of inflorescences in the upper part of the main stem, the inflorescences of the lower part of the main stem and branches are less, easy to fall off, and the pod-forming rate is low, and there are a few nutrient strains (no flowers and no pods).
When this happens, some measures need to be taken to curb the excessive growth of soybeans.
Fertilization control method
Minimize the application of nitrogen fertilizer because the rhizobium of soybean itself has nitrogen fixation capacity. Therefore, in the rainy weather, it is strictly forbidden to apply nitrogen fertilizer to Wangchangtian block, and a small amount of molybdenum fertilizer can be sprayed at the initial flowering stage, the concentration is 0.1%-0.2%.
In the past two years, many soybeans have pods and no seeds. That is because “smoothy†only flowers and no powder is applied. Therefore, when boron fertilizer is added at this time, pollination can be increased, pods can be increased, and the pods will be full, so that the yield will increase. .
Apply a small amount of nitrogen fertilizer to the poorly growing field, which can be sprayed together with molybdenum fertilizer at the initial flowering stage, and the urea is about 5 kg.
Artificial control
In the flowering and pod-forming stage of soybean, the field that can not effectively control the growth of soybeans by chemical control can be combined with artificial control technology, and the method of leaf thinning, topping and nutrient removal is adopted to control the field. Achieve good ventilation and light transmission conditions.
1) Sparse leaves. In the early stage of prolonged period, the prosperous plants were tipped and cut in time to create a reasonable group structure. When you are tipping, you must master the principle of “do not fight late, fight fat, not thin, and play rareâ€. At the same time, you should also pay attention not to play too much. Generally, the tip of the main stem is 2 to 3 cm. It is appropriate.
2) Go to the nutrient strain. Due to the long length of soybeans, there are a few nutrient strains in the soybean population, which are not podted or pod-poored and should be removed in time.
The manual control method requires a lot of manpower, and it is used less today in the absence of labor.
Chemical control
At present, the more common method of chemical control is the spraying of paclobutrazol. Paclobutrazol is a plant growth retardant that inhibits the synthesis of growth promoters in plants and inhibits the vertical growth of cells.
However, chemical control has higher requirements on the use time and usage, and its physical and chemical properties are stable, and the degradation is slow, which will affect the part or whole growth period of the crop.
Note: If you want to see the flowers, you can control it. If some soybeans are high, but they are not flowering, you can't fight. If you see flowers, one is to control the insects, and the other is to control and prosperously combine and control. It can be sprayed together with the insecticide and the boron-molybdenum fertilizer, so as to control the plant height and promote the growth, and can control the insects.
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