Measures of "three Prevention" to promote yield increase in the later stage of Peanut

Production practice has proved that in the middle and later stages of peanut growth, timely "three prevention", that is, prevention of overgrowth, premature senility and disease and insect pests, can increase production by 20% and 30%. (1) Peanut fields with good water and fertilizer conditions and vigorous growth of dwarf plants can be sprayed with plant growth regulators when a large number of peanut fruit needles enter the soil. 15% paclobutrazol powder was sprayed on 40-50Kg / mu or 20% 30ml / mu / mu 40Kg. Should be sprayed in the afternoon to avoid re-spray, leakage spray, spray within 8 hours in case of rain to re-spray. (2) for peanuts with insufficient basal fertilizer or high yield, spraying foliar fertilizer in the middle and later stage of peanut growth is an effective measure to obtain high quality and high yield of peanut. The mixture of 1% urea and 0.5% potassium dihydrogen phosphate can be sprayed 50 days before harvest, 50 Kg per mu. Spraying every 10 days, generally spraying 2 Mel for 3 times, played a significant role in improving the photosynthetic capacity of leaves and promoting the fullness of pods. (3) Disease and pest control due to more rainfall and high humidity in the middle and later stages of peanut growth, it is easy to lead to the occurrence of leaf spot disease, and the yield of peanuts is generally reduced by 20% and 30%. 50% carbendazim 1000 times solution, 70% mancozeb 500 Mel 600 times solution or 70% methyl topiramate 1500 times solution can be used for prevention and control, spraying every 7 days for 2 times continuously for 3 times. The main pests in the later stage of peanut are grub and cotton bollworm. From late July to early August, 0.5 Kg of amidophos or phoxim were used to control grubs. To control Helicoverpa armigera, the harm of cotton bollworm was found from early July to early August. 1500 times liquid of Kuaishaling can be sprayed in the evening or morning, and mixed with fungicides.