The filling period of walnut kernels is also called the rapid conversion period of oil. In Hebei Province, it is from early July to late August, about 50 to 55 days. During this period, the fruit fat increased rapidly, the seed kernels continued to increase, the weight increased rapidly, the water content decreased, and the flavor changed from sweet to crispy. It was a key period for the accumulation of nutrients in walnut kernels and an important period for the formation of walnut quality. The rainfall in this period is relatively concentrated. The high temperature and high humidity climate causes serious pests and diseases, strong vegetative growth and insufficient nutrient accumulation, which seriously affects the quality of walnut fruits. The main work in production is as follows: Irrigation and weeding After the rain, timely cultivating loose soil and weeding, requires "except early, small, except", and ensure that the soil is loose and breathable. For plots with poor water source conditions, it is necessary to repair the tree trays, cover the tree trays with grass or back pressure underground to store rainwater and protect the sensation. 2. Fertilizer management In this period, the demand for water and fertilizer is basically small. In the late stage of hard core in early July, the method of point-type fertilization was used to topdress the fertilizer. The phosphorus and potassium fertilizers were the main ones, and the nitrogen fertilizer was the second. The purpose was to supply the nutrients needed for nucleoli development. Natural precipitation is preserved as much as possible during the rainy season to meet the water requirements of the tree. Foliar application of 0.3 to 0.5% potassium dihydrogen phosphate 2 to 3 times to promote the filling of the tree and seed, and increase the weight of the seed. In August, there is a lot of rain. In places where water is easy to accumulate in low-lying areas, drainage ditch and drainage outlets should be dug for drainage. For individual trees, water can not be discharged, and when water can't penetrate, the burnt honeycomb coal can be used in the base of the stump to form a circle. Pay attention to the water surface above the water, which will save the lives. 3. Pest control The season of entering high temperature and high humidity in summer is the high incidence period of various pests and diseases. It should be detected and timely controlled. In this period, we mainly pay attention to the prevention and control of diseases and insect pests such as walnuts, moths, white-spotted beetles, walnuts, small geese, moths, walnut moths and walnuts. Control methods: picking up fruit, picking up pests and fruits in time to burn or deep burying; trunks tying grass to trap walnut moths; black light traps or artificially killing adult larvae, walnut moths and hawk moths; spraying 1000-1500 times 10% beta-cypermethrin or matrine against walnut limbs, small jibuta and moths; alternating spray 1:2:200 Bordeaux mixture, 50% thiophanate or detox WP 500~ 800 times liquid, control walnut black spot disease, anthracnose disease. Headband Mask,Dust Mask Protective,N95 Certification Mask,Coronavirus Design Disposable Face Mask KUTA TECHNOLOGY INDUSTRY CO.,LIMITED , https://www.kutasureblue.com
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