不同密度及施氮水平对青贮玉米生理特性的影响

Effect of Planting Density and Nitrogenous Fertilizer Applying Level on Physiological Characteristics of Ensilage Corn

以目前普遍推广的中农大67、京科301、龙优1号、吉饲8号为试验材料,通过设置5万株/hm2、6万株/hm2、7万株/hm2、8万株/hm24个种植密度及160 kg/hm2、180 kg/hm2、200 kg/hm2、220 kg/hm24个氮肥施用水平,研究了青贮玉米生长发育及光合生理特性,结果表明:各处理组合中以7万株/hm2,施氮180kg/hm2时叶绿素含量最高。各处理组合中以密度8万株/hm2,施氮200 kg/hm2时硝酸还原酶活性最高。各处理组合中以密度8万株/hm2施氮180 kg/hm2氨基酸含量最高。

In this field experiment, ensilage maize＇ Zhongnongda 67＇,＇ Jingke 301＇,＇ Longyou 1＇ and＇ Jisi 8＇were used as materials. Effects of planting d nitrogenous fertilizer level （160, 180, 200 and were studied. The results showed that among ensity （50 000, 60 000, 70 000 and 80 000 plants/ha） and 220 kg/ha） on maize growth and physiologic characteristics all the treatments, chlorophyll was the highest when plant density was 70 000 plants/ha and nitrogenous fertilizer 180 kg/ha. The reductase activity was the highest when plant density was 80 000 plants/ha and nitrogenous fertilizer 200 kg/ha. The amino acid content was the highest when plant density was 80 000 plants/ha and nitrogenous fertilizer 180 kg/ha.