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During the jointing stage, this period is the sensitive period of wheat moisture, and it is also the period of frequent pests and diseases. In the field management, we should focus on the following points:
First, the good jointing fertilizer applied, pouring good jointing
Wheat from jointing to flowering is a period of large growth in life. It is a period of vegetative growth and reproductive growth. Roots, leaves, alfalfa, stems, ears and other organs grow in an all-round way. Populations and individuals develop rapidly, and the growth of plants is large. The tiller gradually becomes the ear, and the differentiation of florets lays the foundation for the number of grains per panicle. It is the key period for determining the number of panicles per acre and the number of grains per panicle. It requires more fertilizer and water, and the management of field fertilizer and water is very important to ensure the harvest. Therefore, it is advisable to carry out the management of fertilizer and water during the period of the rise, and it is necessary to apply 10-15 kg of urea to the mu. If there is rain, dryland wheat fields can be used for topdressing.
Second, pay attention to weather changes, prevent late spring
After the jointing of wheat, the cold resistance is weakened. If the cold spring occurs, the young ears will be subjected to different degrees of freezing damage. The wheat ears extracted later will reduce the number of grains per ear and reduce the yield. Prevention and remedial measures for early spring frost damage: First, irrigation to prevent early spring frost damage. Since the heat capacity of water is larger than the heat capacity of air and soil, watering before the early spring cold current can increase the water vapor in the near-surface air, and release latent heat when condensation occurs, reducing the variation of the ground temperature. At the same time, the soil moisture increases after irrigation, and the soil heat conduction capacity increases, which increases the soil temperature. Second, the remedy after the early spring frost damage is fertilizer and watering. Immediately after freezing in early spring, wheat should be applied with quick-acting nitrogen fertilizer and watering to promote wheat early tillering, small cockroach rushing to large cockroaches, increase tillering rate and reduce the damage of freezing damage.
Third, comprehensive prevention and control of pests and diseases
In the middle and late stages of wheat growth, it is the main period of occurrence of various diseases and insect pests, which has a great impact on yield and quality. There are mainly wheat aphid, wheat spider, rust, powdery mildew, sheath blight, scab, etc. It is necessary to make predictions and keep abreast of the dynamics of pests and diseases. If the prevention and control indicators are reached, prevention and treatment should be carried out as soon as possible. Sheath blight, can use 5% of Jinggangmycin water 100 ~ 150ml, 50 ~ 70kg of water, sprayed on the base of wheat stem. Wheat spider can be sprayed with 0.9% avermectin 3000 times liquid and other agents. Wheat bran, can be sprayed with 50% èšœ èšœ å¯ å¯ wet powder 8 ~ 10g per acre. Rust, powdery mildew, 25% powder rust WP can be sprayed with 30g per acre; Scab can be sprayed with 50% carbendazim WP at 75-100g per acre. Scab, mainly for prevention, in the case of continuous cloudy weather, in the wheat heading to the flowering stage, 80% carbendazim ultrafine powder 50g per acre, or 40% carbendazim suspension 150ml water 40kg spray, focus on the uniform spray of wheat ears when spraying. If it rains after spraying, it needs to be sprayed after the rain.
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