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运用三因素五水平二次正交旋转组合试验设计方法，研究了川中丘区川单１５播种期、种植密度和氮化肥用量对产量及其主要经济性状的影响，并建立了相应的数学模型，得出在直播条件下产量６０ｔ／ｈｍ２以上的高产栽培技术方案为：播种期４月６日～１７日、种植密度６１～６６株／ｍ２，氮化肥用量２５０～３００ｋｇ／ｈｍ２。
The effect of nitrogen fertilizer on the yield and its main economic traits was studied by using three factors and five levels quadratic orthogonal rotation combination design method. The corresponding mathematical models were established. The results showed that the high-yielding cultivation techniques with the yield of more than 6t / hm2 under direct seeding conditions were as follows: sowing date was from April 6 to April 17, the planting density was 61 ~ 66 plants / m2, the dosage of nitrogen fertilizer was 250 ~ 300kg / hm2.