Huanghuai and northern winter wheat area
1. Promote control and classification management. For different seedling growth, adapt to local conditions, promote control and combination, classification management, fertilizer and water regulation. Wang Chang Miao is mainly controlled. For the seedlings without de-fertilization phenomenon, the seedlings will be suppressed in early spring, avoid excessive tillering in spring, combined with watering in jointing stage, and apply 10~15 kg of urea in the mu, and the seedlings with de-fertilization phenomenon, combined with the watering period, Topdressing urea 10~15 kg. After returning to the early spring, the Miao Miao was suppressed and controlled in time. The three types of seedlings are mainly promoted. In the spring, the topdressing is carried out twice. The first time in the regreening stage, the seedling temperature is 5 cm, the temperature is stable at about 5 °C, and the top dressing is 8~10 kg and the appropriate amount of diammonium phosphate. The second time is the urea application in the jointing stage. ~7 kg, increase the rate of ear formation, promote the development of small flowers, increase the number of grains per ear. For the late-growing wheat field, it is necessary to control the early spring watering so as not to reduce the ground temperature and soil permeability. The second type of seedlings promotes control and combination. The second-class wheat field with the same level of soil fertility starts from the initial stage combined with watering and mu to recover 10~15 kg of urea; if the level of soil is higher, it will rise to the middle of the top dressing and watering. A type of seedling control promotes combination. Spraying regulators during the up-and-coming period shortens the internodes of the base, controls the plant to grow, and prevents lodging during the late growth period. In the jointing stage, the fertilizer is watered, and the urea is 15 kg of urea.
2. Repressing the water, watering and protecting. After pressing, the sputum is promoted to promote the turf on the soil, and to increase the temperature. In the wheat field where the soil is extensively planted and ploughed during sowing, the soil is repressed in time after freezing, and the soil is compacted to bridge the cracks, reduce water evaporation and promote root growth. For wheat fields with poor grievances, the soil should be replenished in time after thawing, drought-resistant seedlings, timely watering after watering, increase ground temperature, break the knot, and prevent or mitigate the threat of freezing damage. For dryland wheat fields with no water pouring conditions, repressing and lifting the sorghum as a key measure to improve the drought resistance of wheat. At the same time, after the soil is re-slurry or raining, the fertilizer is applied with nitrogen fertilizer. Generally, about 10 kg of urea is applied to the soil, and no fertilizer is applied to the base fertilizer. Phosphate fertilizer is applied with diammonium phosphate.
3. Prevent freezing damage and promptly remedy. Pay attention to weather changes, timely irrigation before cooling, improve soil moisture, adjust the near-surface layer microclimate, reduce the ground temperature change range, and prevent early spring frost damage. After the occurrence of freezing damage, timely apply appropriate amount of nitrogen fertilizer, and then water, to promote recovery.
Winter wheat area in the middle and lower reaches of the Yangtze River
1. Scientific fertilization and construction of groups. Apply strong and strong fat, and weaken and strengthen. For the field where the seedlings are insufficient and the population is small (the number of stems and stems is less than 300,000), especially for the late seeding, the seedlings can be applied for 10~15 kg of ternary high-efficiency compound fertilizer (N, P2O5, K2O each 15 %); For the field where the amount of straw returned to the field is large and the seedlings are too weak, 5 kg of urea will be applied to the mu to promote the transformation and upgrading of the seedlings. Apply a joint fertilizer, strong stalks and large ears. For the first and second types of wheat seedlings suitable for the group, when the leaf color is normal and faded, the first section of the base of the plant is close to the fixed length, and the joint fertilizer is applied. Generally, 5 kg of urea and 10~15 kg of high-efficiency compound fertilizer are applied; For the wheat fields where the population is too large and the leaf color is not normally faded, the jointing fertilizer should be postponed to prevent lodging; for the three types of seedlings with too small a population and insufficient stems, and the wheat fields with severe yellowing and fertilization, appropriate early application of jointing fertilizer .
2. Clear the ditch, drain and drop the stain. In the early spring, the wheat fields that have not opened the drainage ditch, open the wheat ditch in the wheat field as soon as possible, and spread the ditch evenly to avoid damage to the wheat seedlings. The ditched wheat field has been dredged in time to ensure smooth drainage, so that there is no water in the rain and the ditch, and the three ditch outside the wheat field is ensured.
3. Defense against freezing damage and early remediation. Two to three days after the occurrence of frost damage, the degree of freezing of the young panicles was investigated, and the mortality of the stems was more than 10%. Generally, 10% to 30% of the frozen mortality rate is 4~5 kg of urea in the wheat field; for more than 30%, the mortality rate is increased by 10%, and the urea is added by 2~3 kg, up to 15 kg.
Northwest wheat area
1. 耙耱ä¿å¢’, top Ling topdressing. All kinds of wheat fields should be topped, water and water. For the lack of base fertilizer, weak yellow wheat seedlings, combined with topping or light rain, apply 4 to 5 kg of urea. For dryland wheat fields with large pre-winter groups and high soil fertility, it is not advisable to topdress during the regreening period, and it is advisable to topdress when it is up to the jointing stage.
2. Relieve the strokes and raise the temperature. Before and after the early spring wheat is returned to green, it should be suppressed around noon on a sunny day, and should not be carried out on a cold and wet morning to avoid folding the pseudo stem and damage the leaves. It is necessary to use the seedlings because of the seedlings. It is better to plant the weak seedlings at night, to improve the soil temperature, to promote the weak seedlings, and to prevent the roots and the smashing.
3. Protect the film and protect the seedlings. For covered fields, if the coverage is not strict, it is necessary to press the soil in time. It is necessary to prevent the black and white of livestock and poultry in spring, affecting the photosynthetic area and dry matter accumulation of wheat, resulting in reduced production.
Southwest Winter Wheat Region
1. Nitrogen fertilizer moves backwards and timely topdressing. It is necessary to promote the main fertilizer. When there is only one layer of shallow water left in the plain wheat area after watering, 5~8 kg of urea is applied per mu. In hilly areas without irrigation conditions, 5 kg of urea or a quick-acting fertilizer with a similar amount of pure nitrogen is applied to the ditch.
2. Clear the ditch to prevent moisture damage. Jointing to heading is a sensitive period for wheat to wet stains. The paddy field of rice paddy field is poorly matched, and the waterlogging damage is heavier. Before the spring rain, the side ditch, the ditch, the drainage ditch, the drainage and waterlogging should be opened to ensure the normal growth of wheat and grain filling.
(Source: National Agricultural Technology Center of the Ministry of Agriculture)
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