In the early stage of field growth of rapeseed after transplanting, the rapeseed phenomenon such as reddish-yellow leaf, leaf-curled leaf, slow growth or stop growth, poor growth and development, etc. may occur. Preventing and curing rape seedlings must take targeted measures to investigate the causes of the stiff seedlings.
Drought or waterlogging caused by freezing seedlings not only causes plants to lack moisture, but also accompanied by deficiency symptoms such as redness and purple leaves. In the field investigation, the surface of the soil became white and hardened and even cracked. Plants may have wilted at noon on sunny days. Poor drainage may also be caused by transplanting fields, or rape seedlings may suffer from hypoxia and seedlings due to continuous rainy weather after transplanting rape. For dry and stiff seedlings, it is no-tillage and transplanting, and can be used for furrow irrigation, irrigation to the depth of the ditch 2/3, so that the water permeates the infiltration of the soil; it is plowing and transplanting fields, which can use pouring (water) water to resist drought. In combination with topdressing, it is to apply thin fertilizer solution; for the stiff seedlings caused by waterlogging, it is necessary to dredge or deepen the drainage ditch to reduce the groundwater level. In combination with cultivator, the plant ash or mature manure (heap) fertilizer is applied to increase the soil temperature.
Plants caused by lack of fertilizer due to short stature, leaf stenosis, yellow-green leaves, severe stem base red leaves, indicating that the plant lack of nitrogen, timely application of timely nitrogen fertilizer, 15 kg of ammonium per acre with thin fecal water applied If the upper leaves are dark green and dull, the lower leaves are purple, the leaves are slow, and the roots are stunted, they are symptoms of phosphorus deficiency. This can be sprayed with 0.3% potassium dihydrogen phosphate solution 2 to 3 times, once every 3 to 5 days. At the same time Mushi 25 kg superphosphate or calcium magnesium phosphate 30 to 40 kg. The phosphate fertilizer can be mixed with organic fertilizers before the application of mixed heaping and fermentation, and it can be applied after maturity; it may also be due to the lack of boron caused by the frozen seedlings, the performance of slow growth of plants, severe root rot, dead heart, purple leaves. In this regard, can be used with 0.1% borax 30 ~ 40 kg of foliar spray, or mu with 0.5 ~ 1.0 kg of borax 100 ~ 150 kg of water dripping.
The common cause of insect pests and diseases caused by aphids is a serious damage to the aphids, causing atrophy of the plants and inducing a virus disease hazard. In this regard, we must guard against aphid damage and find that there are local aphid hazards, you can use 100% quinone net (Imidacloprid, one over the net, Kang Fu Duo, Dagong Chen) 2500 ~ 3000 times liquid spray; found virus symptoms, it is timely to use 5 The % mycotoxin is sprayed 300 to 400 times for 2 to 3 times, once every 7 to 10 days. At the same time pay attention to the use of 2.5% enemy to kill control of cabbage caterpillars.
Soil compaction caused by stiff seedlings due to compaction, poor plant root development. To do a good job in cultivator, the first time shallow sips and rakes, loosen the topsoil; the second time it is done with grass and grass, deep slashes between rows, remove weeds.
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