Don't relax the management in the later stage of growing peanuts

1. Preventing premature senescence peanut needs more water and fertilizer from podding stage to full fruiting stage. if there is insufficient supply of water and fertilizer, it will cause poor plant growth, poor growth, yellow leaves and premature senescence, resulting in the decrease of green leaf area and photosynthetic capacity of peanut. Less nutrients are produced, dry matter accumulation is reduced, the speed of transportation to pods slows down, and the yield is affected. Fields with premature senescence caused by lack of fertilizer should be sprayed with 0.3% 0.4% potassium dihydrogen phosphate plus 1% urea solution 50 kg outside the roots of 667 square meters from pod to full fruit. it is best to spray every 10 days after 4 p. M. on a sunny day, generally spraying 2 Mel 3 times, which can effectively replenish nutrients and prevent premature senility. For the fields with premature senescence caused by drought, irrigation should be replenished in time to meet the water demand of peanuts, promote the absorption and transport of nutrients, increase the accumulation of dry matter and increase the yield.

Second, during the full fruit period, the vegetative growth gradually decreased, a large amount of nutrients transferred to the pods, and the dry matter accumulated rapidly. However, due to many factors, such as temperature, rain, light and excessive application of nitrogen fertilizer, peanut stems and leaves grew too long, closed too early, closed in the field, consumed a lot of nutrients, inhibited the accumulation of fruit dry matter, and affected the yield. Therefore, for peanuts with the trend of overgrowth, measures should be taken to inhibit vegetative growth and promote reproductive growth, which plays an obvious role in increasing the yield of peanuts.

Third, anti-stagnant peanuts have the characteristics of "like waterlogging days, do not like waterlogging land" and "the ground can not dry needle, the ground wet does not bulge grain". Especially in the late stage of peanut growth, peanut fields must not accumulate water. In case of rain or continuous rain, drainage should be carried out in time to prevent stagnant water, resulting in excessive humidity in the field, resulting in excessive growth of stems and leaves, poor soil ventilation, affecting root system and pod bulging, and easy to cause a large number of rotten fruit or germination, reducing yield and quality. When planting peanuts in the land with high groundwater level, we must implement high ridge cultivation or dig good drainage ditches to lower the water level.

Fourth, the main disease in the later stage of disease and pest control peanut is leaf spot disease, the chlorophyll of the damaged leaves is destroyed, the light and effect is reduced, resulting in early defoliation, affecting dry matter accumulation and pod ripening, generally reducing yield by 15%, Mur20%, and more than 40% in severe cases. In terms of prevention and treatment, 300-fold Bordeaux solution should be sprayed before the disease. In the early stage of the disease, 50% carbendazim wettable powder 800 times solution can be selected for prevention and treatment. The main pests in the later stage of peanut are underground pests dominated by grubs, which should be controlled in time. When aphids occur in the later stage, when the rate of insect plants reaches more than 5%, 10% imidacloprid wettable powder can be used for spray control.