Transplanting rapeseed is affected by adverse environmental factors, it can cause physiological disorders, so that the growth is slow and form a stiff seedling; the stiff seedlings do not occur before the winter, the wintering period is prone to frost damage, and after the spring, the stalks are finely branched and less effective. , seriously affecting production. The specific measures for preventing stiff seedlings are as follows: 1. Flooding and freezing seedlings. Waterlogging is mainly caused by poor drainage or excessive soil moisture in the field during site preparation, making it puddle and paddling to form dark stains; waterlogging leads to poor root development and even rot, red outer leaves of oilseed rape, inner leaf growth stagnation, and leaf color Dark, heart can not be expanded. Flooding and seedlings often occur in rice fields. Preventive measures: (1) Open the Sangou early, reduce the groundwater level, and eliminate dark stains in the field; (2) Choose sunny land preparation, plant large seedlings in sunny days, and avoid raining on rainy days; (3) Apply timely Miao Fei on the basis of enough base fertilizer. And do a good job of cultivating loose soil, in case of rain to clear the gutter drainage in time to prevent water damage. 2, drought damage. Transplanting rapeseed in dry and barren lands, such as severe autumn drought, the fertilizer can not play a role, often due to the lack of water affect the exertion of fertilizer effect and the formation of seedlings. The growth of the roots of the frozen seedlings due to drought is not normal, but the symptoms of the aboveground parts are the same as those of the water, and the leaves are red and grow slowly. Preventive measures: (1) When transplanting, if drought is severe, water should be used for hoeing, then robbing and transplanting, and planting water after pouring; (2) Drought after transplanting, drought resistance in time, combined with seedling fertilizer, promotion Grow. 3, low temperature freezing seedlings. The late transplanting of rapeseed, when the average daily temperature is below 10°C, will form red leaf or yellow leaf seedlings. Preventive measures: (1) Pay attention to early planting, such as delaying transplanting due to the late harvest of the previous crop. Insist on fine soil preparation and apply the seedbed to send the fertilizer. Large seedlings transplanted with soil will be beneficial for survival; (2) With early application of seedlings, early growth will be promoted. 4, lack of boron seedlings. It mainly occurs in the soil where the soil is seriously depleted of boron, and the heavy drought or the damage of the roots may affect the absorption of boron and cause boron deficiency. Boron deficiency, growth and atrophy, leaves purple, leaves do not send, root neck swelling. Preventive measures: (1) 2-3 days before transplanting, the seedbed is sprayed with 60kg of 0.2% borax solution once a day, and transplanting with boron can prevent the early lack of boron-free seedlings; (2) Each time when the boron-deficient field is transplanted Mu 400-500 grams of borax, mixed with soil fertilizer for the base fertilizer application, or after transplanting diluted with water after pouring, while timely drought or drainage, promote root absorption. 5, plant diseases and insect pests. After the rape is transplanted, it is harmed by locusts and the leaves are not easy to spread. After the locust infested, it was infected with a virus disease, causing the leaves to shrink and yellow. Preventive measures: 1 to 2 days before planting spray on the seedbed to get up and prevent tapeworms from transplanting. After the locusts have been planted, they must be sprayed and killed. Adding 500 times more food vinegar in the liquid mixture can increase the killing effect and inhibit the occurrence of viral diseases.
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