Winter is a time when winter wheat grows slowly and the body is weak. Wheat leaves, especially the lower leaves often appear yellow, dry, until the green, jointing period will occur. Even worse. The reasons may be varied and require specific analysis.
Let me first talk about yellow leaves caused by meteorological factors such as low temperature, soil drought, strong wind and frost. The appearance time of this yellow leaf is often closely linked with the weather changes, the range is often very large, and the whole field performance is relatively consistent. This kind of yellow leaf is physiological and generally does not require prevention and treatment. Severe fertilizers can be applied quickly to promote growth.
The second factor is soil nutrient deficiency, including nitrogen, phosphorus, potassium and calcium. Plants lacking nitrogen nutrition are overall yellow-skinny and grow slowly. It is not difficult to understand that the way to alleviate this yellow leaf is to top up the irrigation and fill it out.
Another factor is soil compaction, flooding, waterlogging, salt and alkali damage, and toxic substances. All the factors that can affect root growth and even cause some root deaths can cause yellow leaves. In recent years, there have been frequent occurrences of the use of pharmaceuticals, especially excessive herbicides or improper methods and straws are not finely crushed, unevenly dispersed, and yellow leaves caused by aerial roots. Of course, measures are to improve the soil, increase organic fertilizers, promote intensive cultivation, and regulate the use of drugs.
The last big class of factors is pests and diseases. Let's talk about insect pests. They are all living underground. They are collectively called underground pests. The method of prevention and control is chemical seed dressing and soil treatment. Available agents such as phoxim and chlorpyrifos. The main diseases are sheath blight, total erosion and root rot. All of them are fungal diseases. They can all appear yellow leaves at the beginning of the disease. However, the site of lesions and the shape of lesions are different. Rhizoctonia mainly damages the leaf sheath, forming a cloud-like spot (larger) and expanding slightly from bottom to top; full-blown disease mainly damages the base of the stem and roots. Typical lesions occur at the base of the stem, and the color is very high. Deep, much like a black plaster, lesions also form on the leaf sheath, but do not expand upwards; root rot only occurs in the roots, turning brown and rot. All of them rely on soil-borne diseases, so the elimination of diseased bodies, the use of decomposed fertilizers and the dressing of pesticides are all effective preventive measures. Jinggangmycin is a specific drug for the control of sheath blight, and tebuconazole and propiconazole can simultaneously treat these three diseases. Remind everyone that the liquid must hit the stem base and partially penetrate the soil. For this purpose, 60-100 kg per mu of spray liquid should be achieved.
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