在肥、水、土基础较好的生产条件下,玉米要获得高产,关键是培育壮苗,协调根与茎叶的关系,防止倒伏。几年来,我们在夏玉米高产栽培研究中,采取三叶退土晒根、蹲苗促壮,单产均在千斤以上。一九七九年,襄县胡岗大队农科站种植二亩许单二号,采取三叶退土晒根蹲苗促壮措施,单产高达一千二百○四斤。实践证明,退土晒根较目前所采用的深锄……等蹲苗措施,有明显的增产效果。据反复试验,晒根可比深锄增产百分之三到十一点九。 Under the conditions of better production of fertilizer, water and soil, the key is to cultivate strong seedlings and coordinate the relationship between roots and stems and leaves so as to prevent lodging. Over the past few years, we in the high-yielding cultivation of summer maize, taking clover leaves sun roots, Dunmiao Zhuang Zhuang, yields are above the kilogram. In 1979, Hu County Brigade Agricultural Station of Xiang County planted two acres of Xu Shan No. 2, taking clover leaves sun rooting Dunmiao vigorous measures, yield as high as 1240 kg. Practice has proved that the sun-cut roots than the current use of deep hoe ... and other squatting measures, there is a clear yield increase. According to repeated tests, sun roots can yield three to 11.9 percent more than the deep hoe.