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１９９６年，以油研７号为材料进行了播期、密度、施氮量、施磷量、施钾量对油菜群体角果数影响的研究。结果表明，密度对群体角果数的影响达到极显著水平，进一步证实了密植增角夺高产的栽培技术措施。群体角果数与群体产量之间呈极显著正相关（ｒ＝０．８１９６＊＊）。每公顷要获得３０００ｋｇ以上的产量，其群体角果数应在８０３２．５万个以上，每公顷要获得３７５０ｋｇ以上的产量，群体角果数应在９１９０．５万个以上。
In 1996, we studied the effects of sowing date, planting density, nitrogen application rate, phosphorus application rate and potassium application rate on the number of pods in Rape. The results showed that density had a significant effect on the population of pods, which further confirmed the cultivation techniques of planting high yield and increasing yield. There was a significant positive correlation between population pod number and population yield (r = 0.8196 **). Each hectare to obtain more than 3000kg of output, the population should be more than 80325000 pectoral per hectare to get more than 3750kg production, the population should be in more than 91,905,000 pectorals.