What is the reason why yellow wheat leaves

Winter is a time when winter wheat grows slowly and is relatively weak. Wheat leaves, especially the lower leaves often appear yellow, dry, until the green, jointing period will occur, and even continue to increase. 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. After checking the heart and roots are normal, generally do not prevent and control, serious can apply fertilizer available 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. What's missing is what you can do.

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 pharmaceutical agents, especially excessive herbicides or improper methods, and the inability of straws to return to the field to disintegrate, disperse unevenly, and yellow leaves caused by aerial root systems.

The last big class of factors is pests and diseases. Insect pests are underground activities, collectively referred to as underground pests. Such as cockroaches, cockroaches, goldworms. By excavating the roots, you can see that they bite the root or the base of the stem. The prevention and control methods are 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. According to the above characteristics, three diseases can be roughly distinguished. 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 treat these three diseases simultaneously. Pharmacy control emphasizes early treatment, and timely spraying in the early onset of the field can generally achieve good control effects. Just to remind everyone that the liquid must hit the stem base and partially penetrate the soil. For this purpose, 30-50 kilograms per acre of spray liquid should be achieved.

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