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(一)播前准备1.深耕整地:土壤耕作层是玉米根系生长的主要场所,耕作层的深浅直接关系到玉米生长的好坏和产量的高低。深耕后,土壤蓄水多,通气好,温度高,好气性微生物多,有效养分增加。因此,玉米扎根深,根量多,吸收水肥的范围广,抗旱、抗涝又抗倒,为夺高产打下良好基础。据我们测定:大寨海绵田0—24厘米土层的玉米根量比一般田相应增加14.3%;0—12厘米土层与12—40厘米土层玉米根量的比值,海绵田为6.5∶3.5,一般田为7.8∶2.2,充分说明加深耕层,对促进玉米根系深扎和根量加多的重要作用。深耕也不是越深越好。
(A) before sowing 1. Deep plowing site preparation: Soil tillage layer is the main place for corn root growth, the depth of tillage layer is directly related to the growth of corn is good and bad and the level of output. After deep plowing, the soil has more water, good aeration, high temperature, more aerobic microorganisms and more effective nutrients. Therefore, corn rooted deep, root amount and more to absorb a wide range of water and fertilizer, drought, waterlogging and anti-down, to lay a good foundation for winning high yield. According to our determination, the amount of maize root in 0-24 cm soil layer in Dazhai sponge field increased by 14.3% compared with that in normal field. The ratio of corn root quantity in 0-12 cm soil layer and 12-40 cm soil layer was 6.5: 3.5, the general field of 7.8: 2.2, fully explain the deepening of the topsoil, to promote the corn roots and tie the amount of more important role. Deep plowing is not as deep as possible.