通过设置7.50、11.25和15.00万株/ha 3个种植密度，研究其对全株玉米饲用营养价值的影响。结果表明，随着种植密度的增加，单株的饲用物质产量显著降低，但群体鲜物质和干物质产量显著增加，且在高密度条件下可获得较高的籽粒产量。随着种植密度的增加，全株玉米的粗蛋白、粗脂肪和粗纤维含量差异显著，但粗蛋白、粗脂肪、粗纤维、无氮浸出物以及总能量的产量显著增加。合理的增加种植密度，并施用植物生长调节剂植物动力2003进行调控，可以改善玉米的植株性状，获得较高的饲用物质产量，提高全株玉米的饲用营养价值。

In a field experiment, the effects of plant density (75 000, 112 500 and 150 000 plant/ha) on forage nutritive value were studied. The main results were as follows: with the increase of plant population, fresh matter and dry matter yield per plant of corn decreased significantly, but those per hectare of corn increased significantly, and higher grains yield was gotten at higher plant density. Forage nutritive quality of whole plant corn changed, and crude protein (CP), ether extract (EE), crude fiber (CF), nitrogen free extract (NFE) and general energy (GE) yield increased significantly. It could harvest more forage matter yield and improve forage nutritive value of whole plant corn through the increase of the plant density of corn by applying plant growth regulators.