1. Reapplying chemical fertilizers and ignoring organic fertilizers Some people think that the more fertilizers are produced, the blinder is to compare the amount of chemical fertilizers, lightly apply organic fertilizers, cause soil compaction, severe salinization on the ground, green moss on the surface, and red moss in severe cases. The root system is hindered in the high concentration of soil solution, the leaves are aging, the vegetative growth is poor, and the yield is decreased. Such sheds should be supplemented with organic fertilizer, with little or no chemical fertilizer to reduce fertilizer damage.
Second, the use of diammonium in the melon period does not meet the growth law of cucumber. The approximate proportion of fertilizer required for cucumber fruiting is N:P:K=5:2:6, and phosphorus in diammonium is the main one, and excessive phosphorus poisoning will inhibit the absorption of trace elements such as Cu and Fe. Therefore, the double-ammonium should be avoided in the melon period, and the phosphate fertilizer must be applied at the bottom. The nitrogen and phosphorus fertilizers are mainly used before flowering, and the nitrogen and potassium fertilizers are the main stage.
Third, in order to reduce the temperature, excessive shading with grasshoppers in the early stage of planting, the light intensity is large, in order to reduce the temperature, moderate shading is possible, but if the shading is excessive or winter shading, it will cause insufficient light, affecting flower bud differentiation and reducing yield. The temperature should be lowered by venting.
Fourth, a variety of pesticides mixed, the concentration is too high, the amount of liquid is the first one is a chemical reaction between some of the agents, reducing the agent. Second, a lot of medicines are compound medicines, and they have been mixed. Third, the concentration is increased, the leaves are often immersed in a high concentration of liquid medicine, so that the function of the leaves is reduced, the aging is accelerated, and photosynthesis is reduced.
Fifth, no disease, no drugs, disease prevention and treatment of disease prevention should be based on prevention, supplemented by treatment, early medication prevention, not only low cost, but also good results.
Sixth, the "bad faucet" was mistaken for black star disease in recent years. In November, many cucumber sheds appeared "bad faucet" phenomenon, which is considered to be black star disease. In fact, this is due to changes in external climatic conditions, which have a certain impact on the physiological activities of cucumber plants, and the "physiological diseases" caused by the restriction of the absorption of trace elements such as calcium. The leaf surface should be supplemented with trace elements in time.
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