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一、造好底墒保证苗期旱长1.苗期旱长主要靠底墒。地平、墒足是取得苗全、苗壮的保证措施。播种当时的土壤含水量要求在18—25%范围内,含水量越足,发芽出苗就快而整齐。三叶期至分蘖期的土壤最适宜含水量为15—21%,在此范围内水分越足,分蘖早而多,成穗率高。在整地开始前对旱种地块普遍测定土壤水分,如果粘土含水量低于20%,砂壤土低于
First, make a good end moisture to ensure that seedling drought long 1. Seedling dry mainly rely on the end of moisture. The level of soil moisture is sufficient to obtain Miao, Miao Zhuang guarantee measures. At the time of sowing soil moisture requirements in the range of 18-25%, the greater the water content, germination on the fast and tidy. The optimum water content of soil from the three-leaf stage to the tillering stage is 15-21%. Within this range, the more adequate water, the earlier and more tillering, the higher the earing percentage. Soil moisture is generally measured on dryland plots prior to the start of soil preparation. If clay moisture content is less than 20%, sandy loam soil is below