Four effective measures to control rice red blight

After a good early growth, rice enters the reproductive growth stage in the middle and later stage. strengthening the field management at this stage is closely related to the yield and quality of rice. So, how to do well the field management in the middle and later stage of rice growth?

The main results are as follows: 1. timely roasting should be carried out in the period when rice is not sensitive to water, that is, from late tillering to early panicle differentiation. The following principles should be followed in the operation, that is, the appropriate early roasting of the seedlings; the mud feet are deep, and those with overgrowth should be heavier, otherwise they should be lighter; if the water conservation is not good, it should not be re-baked; saline-alkali paddy fields generally cannot be roasted.

Second, the long heading stage of scientific irrigation is the peak of physiological water requirement in rice life, especially in 2-14 days before heading, which is the most sensitive to water, so as not to affect the differentiation and development of spikelets. After baking, the rewatering of the field should be irrigated frequently in shallow water, and the gap irrigation method of "old water is not dry and new water is not available" should be adopted. The scientific irrigation after baking not only greatly saves precious water resources, but also improves the soil ecological environment, maintains and improves the root activity, and is conducive to the absorption and transportation of nutrients.

The irrigation method of heading and fruiting stage is: heading in deep water, shallow water grouting, moist seed raising, drainage and drying about 5 days before harvest. Do not cut off the water too early, affecting the grain weight.

Third, skillfully applying spike grain fertilizer is generally applied after the beginning of young panicle differentiation, and the amount should be determined according to the field growth of rice: too many tillers, less and late application for those with thick leaves, 2.5-3 kg urea per mu; insufficient number of tillers, yellow leaves and different shades of leaves should be applied early and heavy, and about 5 kg urea per mu.

The increase of grain fertilizer is mainly due to the deficiency of panicle fertilizer. The best application period of grain fertilizer is the period when the leaf energy of rice turns light naturally before breaking, that is, it is suitable for topdressing 2-3 days before heading. Generally speaking, urea is the best grain fertilizer, and the application amount is about 2.5 kg per mu. However, the soil fertility is sufficient, the growth is too prosperous, and the fields with thick leaves should not be fertilized with grain fertilizer to prevent greedy green and late ripening, affecting the yield and quality. In order to prevent premature senescence after heading, foliar fertilizer should also be sprayed at this time by using 1% urea, mixed with 0.2% potassium dihydrogen phosphate, and spraying 50-70 kg of its solution per mu. Spray in the afternoon and evening on a sunny day, spray to both sides of the leaves.

Fourth, in the middle and later stages of rice growth, emphasis should be placed on the control of bacterial leaf blight, sheath blight, rice false smut, rice stem borer, rice planthopper, rice planthopper and other diseases and insect pests. According to this actual situation, the pesticide mixed technology should be used for compound control, such as bacterial blight, Chilo suppressalis and other compound hazards, the mixture of Yekuning and Shachongshuang can be used to control, which not only saves labor and time, but also has a good control effect.