Soybean first flowering period, the best time to control prosper
The field performance of common soybean flourishing: luxuriant branches and leaves, poor ventilation and light transmission, completely enclosed leaves; thick upper leaves, dark green in color, the size of the leaves close to the palm of an adult, the lower leaves turn yellow and begin to fall off; except for a small amount on the upper part of the main stem Outside the inflorescence, the lower part of the main stem and the branches have fewer inflorescences, easy to fall off, low pod setting rate, and a small amount of vegetative plants (without flowers and no pods). When the above situation occurs, some measures need to be taken to curb the excessive growth of soybeans. One is the fertilization control method. Use as little nitrogen as possible, because the soybean rhizobia has the ability to fix nitrogen. Especially in the rainy weather, it is strictly forbidden to apply nitrogen fertilizer to the Wangchang field. A small amount of molybdenum fertilizer can be sprayed at the initial flowering stage, with a concentration of 0.1% to 0.2%. In the past two years, many soybean fields have pods without seeds and are "fancy but not solid", mostly due to poor pollination of plants. Supplementary application of boron fertilizer can enhance the pollination effect and increase pod formation, which is conducive to full pod formation. A small amount of nitrogen fertilizer can be applied to poorly growing fields, and it can be sprayed together with molybdenum fertilizer at the initial flowering stage. Use about 5 kg of urea per mu. The second is the chemical control method. At present, the most common method of chemical control is to spray paclobutrazol. Paclobutrazol is a plant growth retardant, which can hinder the synthesis of growth promoters in plants and inhibit the longitudinal growth of cells. However, it should be noted that chemical control requires higher time and dosage of pesticide spraying. At the same time, its physical and chemical properties are stable and degradation is slow, which will affect part or the entire growth period of subsequent crops. The principle of chemical control is to use medicine only when you see flowers. Some soybeans have not bloomed even though the plants are tall, and medicines cannot be used at this time. Taking into account the need to prevent and control diseases and insect pests, you can spray with insecticides and boron and molybdenum fertilizers after the soybeans bloom, which can control the height of the plant and promote the growth and control the insects. The third is artificial control. During the flowering and pod-setting period of soybeans, the chemical control of the prosperous field fails to effectively control the prosperous growth. The methods of thinning leaves, topping and removing the nutrient plants can be adopted to control the prosperous growth, so that the field can achieve good ventilation and light conditions. (1) Thinning branches and leaves. In the early stage of soybean flourishing, the flourishing plants should be sharpened and cut in time to create a reasonable group structure. The principle of “beating early and not late, fattening but not thinning, thinning and not beating dense†should be used when sharpening the tip. At the same time, attention should be paid not to beat too hard. Generally, pinch off the 2~3cm tender tip of the main stem. Appropriate. (2) Remove vegetative strains. Due to the lengthy growth of soybeans, there are a small number of vegetative plants in the soybean population, which do not set pods or have few pods, and should be removed in time. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Industrial 100Hz LiDAR Solutions
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