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去冬以来,全国各地农村响应英明领袖华主席的战斗号召,掀起大搞农田基本建设的高潮,取得巨大成绩。许多社队在改土造田过程中,注意保留熟土层,这是十分必要的,是保证当年改土、当年夺高产的一项关键措施。但是,由于改土造田的范围广、面积大,也有不少地块打乱土层,生土盖面。不采取有效措施生土地是长不好庄稼的,这是因为:(1)生土地坷垃多,易漏风跑墒,土壤水分状况不如熟土稳定;(2)生土速效养分少,而且微生物活动远不如熟土旺盛,不能及时满足庄稼对养分的需求;(3)生土结构差,通气和稳温性能差,耕性不良。
Since the winter, the countryside in all parts of the country has responded with the call of Chairman Hua, the wise leader, to set off the climax of popularizing farmland infrastructures and achieved great successes. It is very necessary for many communes and brigades and teams to pay attention to the retention of mature soil layers in the course of land reclamation and land reclamation. It is a key measure to ensure soil improvement in that year and to achieve high output in that year. However, due to the wide range and large area of land reclamation, there are also many plots that disrupt the soil layer and generate soil cover. Without taking effective measures, the raw land is not good for crops because: (1) The raw land is more and more rubbish, it is easier to leak wind and moisture, and soil moisture is not as stable as the mature soil; (2) The quick-acting nutrient of the raw soil is small and the microbial activity Far less mature soil, can not meet the crop’s nutrient needs; (3) poor soil structure, aeration and temperature stability of poor, poor plow.