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采用二次通用旋转组合设计，通过１９９２年多点重复试验，研究了内蒙古后山半干旱偏旱区马铃薯经济产量与密度、碳铵施量和播期之间的关系及交互效应，并建立了块茎产量；商品薯率的数学模型。结果表明，各因素影响马铃薯块茎产量的顺序是密度＞播期＞施肥量。基本明确了在该区以丰产高效和高商品薯率为不同目的时，种植密度、碳铵施量和播期的最优组合，为大田生产提供了科学依据。
The quadratic universal rotary combination design was used to study the relationship between potato economic output and density, ammonium bicarbonate dosage and sowing date and interactive effects in semi-arid and semi-arid dry land from the mountain in Inner Mongolia through multi-point repeated tests in 1992, Tuber yield; mathematical model of commodity potato yield. The results showed that the order of the factors affecting potato tuber yield was density> sowing date> fertilizer amount. The optimal combination of planting density, ammonium bicarbonate application and sowing date was basically clarified in this area with high yield and high yield and high potato yield, which provided a scientific basis for field production.