夏玉米免耕增产效果的初步研究

适期早播,促进苗期生长是夏玉米高产、稳产的关键措施。翻耕种植夏玉米,常因不能适期播种,不易保墒,难以获得稳定增产,铁茬播种,虽能适期播种,但如播后管理不及时容易形成草荒,加之保墒效果差,亦使夏玉米产量难以提高。因此,采用人工模拟免耕的试验方法,连续三年进行麦茬夏玉米免耕田间试验,结果:麦茬免耕种植夏玉米,不仅能适期早播,而且还能保墒、降低土温,促进苗期生长和提早成熟,干旱年份增产效果显著。对华北小麦、夏玉米为主的一年两熟地区,确保夏玉米稳定增产具有一定指导生产的意义,现将初步结果整理如下。

A PRELIMINARY STUDY ON THE INCREASING YIELD EFFECT FOR SUMMER MAIZE IN NO-TILLAGE SYSTEM

Earlier sowing in suitable period and prometing the seedling growth well are the keys to keep the high and stable yield of the summer maize.Owing to the plough down,it is not easily to sow in suitable period and keep the moisture of the soil.It is difficult to keep the high level of the yield of summer maize.Under the stub sowing, although the maize may be sowed earlier after wheat,it is also difficult to keep the soil-moisture if management is not in time,and the field is liable to be weedy,too.It is still...