采用二次回归旋转组合设计在黑龙江绥化对垦稻12进行了不同种植密度、不同施肥量对产量影响的比较研究。结果表明，垦稻12在种植密度为27.7万丛/ hm2，氮、磷、钾施肥量为92.36 kg/hm2、37.5 kg/hm2、75.8 kg/hm2时产量最高，达9 266.8 kg/hm2；在种植密度30.5万丛/hm2，氮、磷、钾施肥量为70.0 kg/hm2、50.3 kg/hm2、90.9 kg/hm2时的食味品质分最高，为84.8分。

The effects of different planting dengsity, N and K fertilizer appling amounts on rice Kendao 12 yields and its components were studied by rotation composite design of quadratic regression in Suihua, Helongjiang Province. The results showed that the highest yield（9 266.8 kg/hm2） is gained with planting density 277 000 hills/hm2, nitrogen 92.36 kg/hm2, phosphorus 37.5 kg/hm2, potassium 75.8 kg/hm2; the highest points eating quality is gained with planting density 305 000 hills/hm2, nitrogen 70.0 kg/hm2, phosphorus 50.3 kg/hm2, and potassium 90.9 kg/hm2.