【摘要】 1997年～ 1998年在半干旱偏旱区的会宁 ,对 30 0 mm、350 mm和 50 0 mm不同降水带区地膜玉米种植密度和施肥量进行了回归模拟组合寻优。初步提出了在正常年份不同降水带区最佳产量 ;并从不同区土壤供肥状况和肥料利用量化指标进一步论证了这一结果的可靠性。更多还原

【Abstract】 From 1997 to 1998 in the county of Huining, located in the area having no enough rainfull, we hare maize planted by corering field with plastic film in different precipitation areas where annual rainfall is 300 mm, 350 mm and 400 mm. To find a best way for maize planting, we hare tried planting maize spacing differently and manu ring the field in different way. and hare brought up a practicable program for plating maize with best spacing in the rows and the volume of manure in different precipitation areas under normal conditions. The program nas prored to be practicable by means of how spreading manure according different soil. It is helpful to us to plant maize by corering field with plastic film in a half arid area. It is also important for us to popula rize the agricultural technique.更多还原