Scientific prevention and control of rice seedlings

In recent years, the frequent emergence of sterile seedlings after rice transplanting has affected the early development of rice and the formation of high-quality groups in the mid-season, constraining the realization of high-yield rice targets. There are many types and causes of the occurrence of rice seedlings, which should be controlled scientifically according to specific incentives.

1. Toxic substances in soil poison poisonous rice roots. The soil is too thick, sticky, and poor in permeability, which promotes the accumulation of toxic substances; or the wheat straw returned to the field decomposes under hypoxic conditions to produce a large amount of poisonous reducing substances such as hydrogen sulfide, poisoning rice roots, causing rice seedlings to fail. hair. The prevention methods for such a kind of stricken seedlings are: transplanting shallow water to plant hoe, planting wet irrigation, irrigating about 10 centimeters of shallow water layer every 3-5 days, and watering it for 2 days after dripping, 2-3 times in succession. . Immediately after the occurrence of a stiff seedling, the water should be drained and reduced to dryness, aerated and oxygenated, accelerated decomposition of the straw, and oxidation of toxic reducing substances.

2, lack of essential nutrients caused by the frozen seedlings. In general, potassium, zinc, iron and other elements are the most common. Control methods: First, organic fertilizer and comprehensive nutrient composition of special fertilizer for rice to meet the various nutrients needed for rice growth. Per mu of livestock manure 1500-2000 kilograms, or home miscellaneous ash 2500-3000 kilograms, rice special formula fertilizer 40 kilograms. The second is to increase the application of biological potassium fertilizer, 200-400 ml per acre, decomposition release of insoluble potassium in the soil, increase soluble potassium content. The third is spraying plant growth regulators such as stiff seedlings or plant vitality elements to supplement trace elements and balance the nutritional level of the seedlings. 200 grams per acre with stiff seedlings or 150 grams of plant vitality, spray 40-50 kg of water evenly. After the occurrence of a shortage of nutrients, the deficiency of nutrients should be judged according to the typical symptoms of lack of supply, and then targeted measures should be taken according to the principle of lack of supplements. Potassium deficiency plots use potassium chloride 10 kilograms per acre for each acre; zinc deficiency plots apply 2-3 kilograms of zinc sulfate and 8-10 kilograms of silicon fertilizer per acre; iron-deficient fields can be sprayed with soluble iron salts.

3, pesticide residues caused by the frozen seedlings. For example, continuous application of a series of herbicides such as chlorfloxacin, the increase in pesticide residues in the soil, inhibition of rice root growth, decreased rice root absorption capacity, resulting in a frozen seedlings. Immediately after the discovery of such stiff seedlings, plant growth accelerants such as zomate seedling or 802 should be sprayed to promote the robust growth of seedling roots, enhance the root absorption function, and increase the photosynthetic capacity of the leaves. Apply 200-300 grams of stiff seedlings or 10 ml of 802 pairs of water per acre.

4, other types of stiff seedlings. Deep planting will cause stiff seedlings. When planting rice seedlings, we should stick to shallow planting to prevent deep planting. Continuous high temperatures can also cause stiff seedlings. At this time, the deep soil water seedlings should be used to reduce the soil temperature, and 10 kg of urea should be added per acre to promote normal rice growth. Grow.

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