The varieties that cause wheat yellowing are sensitive to potassium deficiency: there are many varieties of wheat with yellowing, but the first areas where yellowing and yellowing are relatively large are limited to a few varieties, and these varieties may be sensitive to potassium deficiency. Early broadcast leggy: Where the yellow wheat crops appear dead, most of them are planted before and after cold dew, which is about 15 days earlier than in previous years. Due to the earlier date of sowing, coupled with adequate rainfall, it is generally a phenomenon of leggy, and then it will yellow and die. However, the wheat replanted on the same plot was neither leggy nor erythematous. The soil is severely deficient in potassium: For many years there has been no application of farmyard manure and potash or very little potassium. The continuous high yields in the summer and fall, and the high consumption of land, especially the fact that the potassium in the soil has reached the point where it does not work, has failed to make up for it in time. Winter sowing partial nitrogen fertilizer: Partial application of nitrogen fertilizer causes a serious imbalance in the proportion of nitrogen and potassium. Due to the high price of potash this year, combined with the combined effects of various factors, the farmers began to reduce the amount of potash fertilizer by deliberately or unintentionally from the start of autumn crop fertilization. Many farmers in the case of nitrogen fertilizer, but also blindly increase nitrogen fertilizer, to make up for the lack of potassium fertilizer, resulting in excess nitrogen, potassium deficiency, a serious imbalance in the proportion of nitrogen and potassium, resulting in a large area of ​​yellow wheat withered. The survey found that as long as no partial application of nitrogen fertilizer, where the use of famous potassium fertilizer and famous compound fertilizer wheat, regardless of sowing date sooner or later, no matter what breed, there are very few symptoms of yellowing.
Control methods Foliar spraying fertilizer: In addition to wheat that has already died, yellow wheat and wheat that has appeared yellow seedlings, spraying 0.3% potassium dihydrogen phosphate solution on the foliage, spraying once every 5 to 7 days, even Spray 2 or 3 times. Topdressing Potash: In the case of athlete's foot, 8~10 kg of high-quality potassium fertilizer is chased per mu. What needs to be reminded is that many farmers still consider wheat yellowing to be caused by nitrogen deficiency and plan to top up urea after snowfall. If you do this, you can only increase the degree of yellowing. Application of potassium to replant: In the irrecoverable wheat field, in the case of sensational circumstances, after the application of quality potassium fertilizer 8 to 10 kg per acre, select the strong spring varieties re-seeding, sowing 15-20 kg per acre. The wheat planted before and after the winter solstice was raised in mid-to-late January 2009. As long as it is properly managed, it will still produce 250 kilograms per mu in the coming year.
Control methods Foliar spraying fertilizer: In addition to wheat that has already died, yellow wheat and wheat that has appeared yellow seedlings, spraying 0.3% potassium dihydrogen phosphate solution on the foliage, spraying once every 5 to 7 days, even Spray 2 or 3 times. Topdressing Potash: In the case of athlete's foot, 8~10 kg of high-quality potassium fertilizer is chased per mu. What needs to be reminded is that many farmers still consider wheat yellowing to be caused by nitrogen deficiency and plan to top up urea after snowfall. If you do this, you can only increase the degree of yellowing. Application of potassium to replant: In the irrecoverable wheat field, in the case of sensational circumstances, after the application of quality potassium fertilizer 8 to 10 kg per acre, select the strong spring varieties re-seeding, sowing 15-20 kg per acre. The wheat planted before and after the winter solstice was raised in mid-to-late January 2009. As long as it is properly managed, it will still produce 250 kilograms per mu in the coming year.
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