During the period of nitrogen-controlling seedlings, the amount of nitrogen fertilizer should be appropriately reduced. Partial application of nitrogen fertilizer should be avoided to prevent young plants from growing young and having poor cold resistance. Top dressing is early, in order to promote vegetable seedlings. Before applying low-temperature nitrogen fertilizer, it is advisable to spray 0.2%~0.3% potassium dihydrogen phosphate 1~2 times. Fertilize the use of sunny, with cattle, pig manure or compost and other warm fertilizer 100 to 150 kilograms, applied to the root of rapeseed, you can increase soil temperature 2 °C ~ 3 °C. Before cultivating the soil and combining with the cultivator, the smashed soil is cultivated in the rhizosphere of the vegetable, which can loosen the soil and protect the root system directly, but the cultivator depth should be 7-10 cm. Smoke stacks with weeds, straw, litter and other piled piles, except for the ignition, the other with a dry, fine yellow mud lightly compacted, before the onset of frost, ignition smoke in the ignition at the top of the wind. If there is an open flame, then seal it with fine soil, so that it can not only disperse cold currents, but also make fire and soil. Sprayed petroleum vapor suppressants are used to spray 30 to 40 times of oil-suppressant on the plants in sunny days before the onset of the cold current. That is to say, they can form a layer of invisible cold-proof film on the leaves, which will help reduce the transpiration of the leaves and protect them. Vegetable body temperature, to achieve the purpose of cold. Every 667 square meters of fecal matter before freezing use 400~500 kg of thin faecal water, splashing water to freeze and reduce the cold. One to two days before the cold winter invading, the weather was sunny and watered. After freezing, it must be noted that after the cold has passed, the weather has indeed warmed up, and the soil temperature has risen to 2°C to 3°C. Only when the soil and vegetables have been thawed, can it be done, otherwise it will aggravate the freezing injury. Filling and pouring in winter irrigation, the field water can seep through the day. After the irrigation, seize the favorable opportunity to carry out loose soil insulation. Sprinkle the ash before the onset of low-temperature freezing injury. Spread a thin layer of hull ash or ash on the vegetables, or sprinkle 50 kg of wood ash or fire ash between the rows of vegetables. This can prevent cold, freeze, and increase fertilizer, but also on cruciferous vegetables. Root rot has better control effect. Cover in the afternoon before freezing, covering the loquat or vegetables with sparse straw, etc., must not cover all the vegetables, so as not to affect photosynthesis. It is advisable to cover 100 kg of rice straw per 667 square meters. Precipitation on cold-stained and low-lying groundwater fields with high groundwater level, and taking advantage of the “three channels†to ensure the open channels, in order to reduce the water level, remove waterlogging, increase soil temperature, and promote vegetable growth. Lemon Extract,Lemon Extract Powder,Natural Lemon Extract,Pure Lemon Extract NANJING ZELANG MEDICAL TECHONOLOGY CO., LTD , https://www.hawfitness.com