Goji Powder,Goji Plant ,Goji Fruit ,Goji Berry Powder Dried Fruit,Herbal Extract Co., Ltd. , http://www.nbgoji.com
How do rice blight occur?
From late July to early August each year, many rice fields find that the middle and lower leaves of rice become rust-colored or have poor growth. The plants are short-stemmed and do not divide. The diseased plants can be seen after pulling out the seedlings, and the roots are black or dark brown. Rarely, this is called rice blight. According to their causes and symptoms of morbidity can be divided into two major categories of physiological and poisoning. Physiology is caused by the lack of potassium in the soil. Poisoning mainly occurs in long-term soaking, deep mud, poor soil permeability in paddy fields, improper application of organic fertilizer or inorganic nitrogen fertilizer, can also cause root hypoxia, poisoning, red flag Disease; The other reason is due to the use of forsythia in wheat fields, long-term accumulation of bisulfuron-methyl herbicides, affecting the roots of post-planting rice can not be deep, showing a horizontal growth, too late to use chlorotoluron can also cause phytotoxicity. Control methods: 1 improve the soil, deepen the tillage layer, such as the use of plough-free soil conditioner, 100 ml per acre, evenly spray the ground. 2 Rational fertilization and irrigation. Nitrogen, phosphorus, potassium balanced fertilization, field maintenance shallow water ground irrigation. (3) Immediately remove excess water from the existing land mass or increase oxygen in paddy fields. Apply 481 brassinolide 5 g/mu foliar. 4 At the end of the application of zinc sulfate 1.5 kg / acre to promote the effective use of potash. Example: The technical staff of the village of Fengzhuang Township in the county of Hujiao was busy in occupation. In July last year, due to the appearance of large rust-colored lesions in the lower part of the rice seedlings in the village, rice seedlings grew slowly, and the roots of the rice seedlings were darkened and deodorized. Some people think that it is rust, others say it is rice blast disease, and it hasn't been improved for several times with several fungicides. After being identified by the technical staff of the County Agriculture Bureau as a physiological disease of rice, it was beaten again with 481 brassin, and the water in the field was drained. A week later, the rice seedlings began to produce white roots, and new green leaves were emitted. Completely relieved.