Soil selection depends on topography. The temperature in the post is high, and it is advisable to choose the late-maturing varieties with long growth period or medium-late-maturing varieties; the middle-late-maturing varieties are suitable for the flat land; the middle-early-maturing varieties should be selected for the alfalfa land. Soil selection based on soil fertility. Well-behaved plots should be selected from the high-yield varieties of fertilizers; lands with poorer soils should be selected from the resistant varieties. According to the previous crop selection, if the former crop is soybean, the soil fertility is better, and the high-yield crop should be selected; if the pre-picked corn grows well and yields high, the species can be continued; if the former crop is infected with a certain disease, it should be selected Avoid varieties that are susceptible to the disease. In addition, in a certain land, after three or four years of continuous breeding of a variety, there will be land shortage and variety degradation, and new varieties should be replaced. Farmers who choose to cultivate varieties with a high degree of variability may choose varieties that require a high level of cultivation. Farmers who do not cultivate a variety of varieties should choose varieties that do not require strict cultivation. Diseases that are currently more prominent in selecting diseases based on diseases are maize rough dwarf diseases, which are mainly related to soil, soil nutrients are not balanced, and ground temperature is not normal. This type of plot should not be planted in the Denghai 9 and Denghai 9 is suitable for plots with balanced soil nutrients and high maturation levels. The plants grow robustly and produce high yields. The general experience of estimating precipitation and accumulating temperature to select varieties is that the amount of snowfall in winter was small in the previous year and the winter was not cold. In the second year, the summer rainfall would be relatively high, the accumulated temperature would not be high, and species with very long growth periods would not be recommended to prevent Accumulation of temperature is not enough, affecting maturity. Conversely, if there is a large amount of snowfall in winter last year and it is very cold in winter, the summer rainfall in summer is generally less and the accumulated temperature is higher. When selecting varieties, the drought resistance of varieties should be emphasized, and varieties with long growth periods can be planted. You can properly plant some late-maturing varieties. According to the appearance of seed quality selection of reliable seeds generally have the following characteristics: packaging bags once sealed, there are seed company name and detailed address and contact telephone; seed label on the date of production, purity clarity, moisture, bud rate clear; seed shape, size Neat and consistent color. Waterproof Cast And Bandage Protector Waterproof Cast Cover,Waterproof Cast And Bandage Protector,Waterproof Arm Cast Cover,Waterproof Cover For Arm Chengdu Cryo-Push Medical Technology Co., Ltd. , https://www.cryopush.com