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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。
From 1997 to 1998 in Huining, a semi-arid and semi-arid region, regression simulation was performed to optimize the planting density and fertilizer application rate of maize in different precipitation zones of 300 mm, 350 mm and 500 mm. The optimal yield of different precipitation zones in normal years was initially proposed. The reliability of this result was further demonstrated by quantitative indicators of soil fertility and fertilizer utilization in different areas.