“Cultivated land is selected as a good species, with one ridge and two ridges.†Seeds are important means of production, which have great potential for yield increase. Different varieties have different yields, the yield of early-maturing varieties is smaller, the medium-maturing varieties are worse, and the late-maturing varieties are larger. Generally, the average yield increases by about 10% to 15%. Farming species must be cultivated at the same time as early, middle, and late cropping, so as to maximize the effect of the increase in the production of good varieties, so as to “do their best. Its use." Why do crop varieties have to be matched? Natural conditions are different and reasonable collocations must be made. In a region, a county, a township, a village, natural conditions are different, because the crop growth period has a long or short, the accumulated temperature is high or low, there are more or less rainfall, so choose a good variety, to a reasonable match . Soil properties such as fertility are different and should be matched properly. Such as mountain, slope, flat land, depression, black soil, clay, sandy soil, fertilizer land, thin soil, pH is not the same, the soil organic matter content is not the same, so the crop varieties to be planted should be a reasonable match. The cultivation mode is different, and reasonable collocation should be carried out. Maize cultivation mode includes permeation cultivation, seedling transplanting, mulching, etc.; soybeans have narrow-row dense planting, ridge-three cultivation, inter-row mulching, etc.; rice has greenhouse seedlings, alfalfa seedlings, etc. , Late varieties are different, so we must make a reasonable match. Grab ahead of time and do not break the rules of agriculture. Planting several varieties of different sowing dates (such as rice seedlings, such as transplanting) and mature varieties for the same crop is very beneficial for regulating manpower, material resources, and agricultural implements, and it is conducive to early sowing, timely management, and harvesting of bumper crops. To reduce the loss of natural disasters, we must make reasonable arrangements. At this stage, when people cannot fully control the climate and control pests and diseases, if the variety is single, it will sometimes cause serious losses. A reasonable mix of varieties can reduce losses. In short, the premise of a reasonable mix of varieties is to meet and ensure local production needs as a standard, and must not engage in "diversification" of unnecessary varieties. Therefore, an area or a production unit should have a comprehensive range of crop varieties grown in production. The plan specifies what are the headlines and which are the collocations. At the same time, they must also consider which reserve varieties are to be prepared for development. The promotion of improved varieties and the renewal and replacement of varieties will gradually lead to institutionalization.
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