1. Spring varieties distributed in the north and northwest of Yunnan. For the wheat plots with relatively strong growth in the early stage and the required population, the temperature will rise and then be managed according to its growth. If the land fertility is good, and before winter, Applying nitrogen fertilizer, no or little application of nitrogen fertilizer, or postponing to the booting stage, the amount of nitrogen fertilizer should not exceed 5 kg.
2. In the north of Yunnan and central Guizhou, the wheat plantings are late, the field is less tiller, and the seedlings are weaker. When the daytime temperature rises above 10 °C, choose sunny or cloudy days to apply urea 8-10 kg per mu. The amount of wheat tobacco used is one-third of the net work, and the yellow leaves of the wheat leaves are severely planted with 100-gram potassium dihydrogen phosphate to spray 2-3 times, mainly promoting wheat tiller and strong stalk, but should not be in the temperature. Fertilization at very low levels affects the absorption of nutrients.
3. Timely cultivating and weeding, cultivating can eliminate weeds, make water and fertilizers can be concentrated, use water to warm, promote tillering, reduce pests and diseases, eliminate knots, loose soil and enhance soil permeability. Increase the ground temperature. Valerian should be combined with topdressing, so that the soil is buried and the roots are rooted.
4. The rice buckwheat distributed in the middle and southwest of Yunnan Province should clear the ditch and drain the water in time, and drain the water in the plot in time, especially from the jointing to the heading stage, which is a sensitive period of wheat wet damage. If the soil is too wet, the root activity will decrease, the function of the fertilizer will be weakened, and a large number of branches will die in a serious field, and the rate of ear formation will decrease. Therefore, before the spring rain comes, open the side ditch, the ditch, the drainage ditch, strengthen the ditch drainage work, reduce the groundwater level, and eliminate the waterlogging.
5. Strengthen the prevention and control of pests and diseases. After the temperature rises, pests and diseases begin to occur, especially in wheat fields with severe freezing damage. The rate of new tillers is increased, the tissue is tender, and pests and diseases are more likely to occur. For areas or varieties where stripe rust and powdery mildew occur in previous years, as long as the lesions are found in the field in mid-February, timely control should be carried out. 25% of propiconazole (also known as enemy force) emulsifiable concentrate 40 ml or 12.5% ​​per acre. The epoxiconazole suspension is sprayed with 54 to 60 ml or 50% of the powder of oxazolol WP of 25 to 30 g. Aphids occur faster at the booting stage of wheat. In the field, aphids occur in more than 10 seeds per 100 seedlings in a timely manner. 20% of the geranium emulsifiable concentrate per acre can be used as 80% or 20% of geranium or 60% or 40% of Baodefeng 80. Spray in milliliters, etc., do not use excessive amounts of burnt leaves and spray at midnight when the temperature is too high.
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