Southwest Spring Management Technology

I. Management of weak seedlings and strong seedlings in plain wheat areas. For the wheat fields with good sowing quality in the plain area but defertilized, irrigation, topdressing, and spraying of Chlormequat are used during the jointing stage. The wheat field with small population, insufficient nutrition, and severe defertilization should be top-dressed as soon as possible to promote the growth of Oita pods and increase the tillering percentage of tillers. It is necessary to fill the water first, and then apply urea after draining. It is not advisable to apply water after the first application of fertilizer so as to avoid loss of nutrients. The specific top-dressing amount depends on the seedling condition and the previous fertilizer application, and it is 5-10 kilograms per mu. Large populations of prosperous fields or high plant species must be controlled for high levels of protection. In the initial stage of jointing, growth retardants such as chlormequat or dwarf can be sprayed to reduce plant height.

Second, hilly dryland wheat spring tube technology. Hilly wheat areas are dominated by dryland wheat. Late dry lands and thin wheat fields should be used. Small water (faecal) pits, ponds, and other facilities should be used to make up water and topdressing. Mushi urea should be about 10 kilograms. The soil in the Sichuan Basin is generally deficient in phosphorus, and ammonium phosphate can be used to supplement nitrogen and phosphorus at the same time. The use of diammonium phosphate is 20-25 kg per mu.

Third, timely control of stripe rust, head blight and locusts. At present, the wheat stripe rust must be prevented and prevented from spreading to the central disease and severe disease fields in time. In April, wheat entered the stage of flower filling, and it was necessary to control the diseased fields to ensure normal physiological functions of the plants and leaves. For head blight, wheat has more spring rain at the heading and flowering stage, and it is susceptible to the risk of head blight, and prevention and control should be done during the flowering period. We must attach importance to the prevention and control of wheat powdery mildew in dry hills. For locusts, monitoring should be strengthened and regional developments should be released in a timely manner. Technical guidance and unified defense should be strengthened.

Fourth, to strengthen the moisture in rice and wheat fields. Jointing to heading stage is a sensitive period of wheat wetness. If the soil is too wet, the root activity will decrease and the fertilizer absorption function will weaken. In severe fields, a large number of tillers will die and the rate of spike formation will decrease. Therefore, before the onset of the spring rain, we must open up the side ditch, gutter and drainage ditch, strengthen the drainage work of the ditch, lower the groundwater level, and eliminate waterlogging.

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