Spring field rapeseed management measures

Three early cultivators, early irrigation back to Qingshui, early recovery bud Feifei. In spring, soil thawing is prompt and shallow, the compaction is removed, the soil is loosened, the earth is put in place to remove the seedlings, the field weeds and diseases, insects and dead leaves are cleared, the ground temperature is raised, and the seedlings are promoted to grow early. Immediately returning to Qingshui in due course, to late sowing or insufficient field of rapeseed field in the end of February to early March combined with 6.5 tons of urea urea irrigation, appropriate partial application of weak seedlings, promote its transformation and upgrading. Fertilizer can not be excessive, too late, so as not to cause excessive growth of nutrients, greedy green late, late lodging. For those who have good sensation, full fat, and adequate winter fertilizer, timely cultivating can be done.

The main diseases for the timely prevention and control of pests and diseases are virus disease, sclerotinia, white rust and downy mildew; the main pests are aphids and stem stalks. In winter, the climate is warm, and it is rainy in spring. When the temperature rises slowly, pests and diseases are easy to occur.

Emphasis on the boron- and phosphorus-fertilized hybrid rapeseeds is more sensitive to boron, and boron deficiency is not conducive to the development of its heterosis. Phosphorus deficiency affects nutrient accumulation, poor grain plumpness, and increased seed pods. Boron and phosphorus should be sprayed in the middle and late March. 100 grams of borax and 100 grams of potassium dihydrogen phosphate plus 50 kilograms of water are sprayed on the mu, preferably with the combination of boron spray, phosphorus spraying, and pest control. The method is 100 grams of borax per mu, 100 grams of potassium dihydrogen phosphate, 1000 grams of urea plus omethoate or phoxim 50 ml plus 50 kg of water, dissolve spray and mix. It is better to spray on sunny afternoons.

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