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作物种子发芽苗时,要求播种层具有适宜的春墒。土壤水分主要来自于降雨、降雪和灌溉,土壤水分中最有农业价值的是土壤毛管水。保墒,就是设法使土壤毛管水充足,使之满足作物种子发芽及生长发育的需要。几种主要作物种子出苗要求的最低土壤含水量(％)如下表: 辽西水源贫乏,气候干旱,春墒很堆满足作物种子发芽、出苗的要求。但是,只要在秋季采取适当措施,就能保证在播种时有适宜的春墒。建平县青峰山、义成功、白家洼等乡,多年来都有春墒秋保的习惯,春季有20～30毫米降雨便能抓住苗。春墒秋保的做法是: 1. 犁翻擦压 在秋雨较小(20～30毫米)
Crop seed germination, the sowing layer requires a suitable spring moisture. Soil moisture mainly comes from rainfall, snowfall and irrigation, and the most agricultural value of soil moisture is soil capillary water. Preserving soil moisture is trying to make the soil capillary water sufficient to meet the needs of crop seed germination and growth. The minimum soil water content (%) of the seed germination of several major crops is as follows: The water resource in the western Liaoning is poor, the climate is arid, and the soil moisture is very piled up to meet the requirements of germination and emergence of the crop seeds. However, as long as appropriate measures are taken in the fall, there will be a suitable amount of spring moisture at planting. Jianping County, Qingfeng Mountain, meaning success, Baijiawa and other towns, over the years have the habit of moisture fall Qiu Bao, spring 20-30 mm rainfall can seize the seedlings. Spring moisture Qiu Bao’s approach is: 1. Plow friction pressure in the autumn smaller (20 to 30 mm)