粮饲兼用型玉米青贮产量形成与生理特性的研究

本试验选用在四川当地适合作青贮的粮饲兼用型玉米品种川单21、成单22、雅玉8号和燎原青贮玉米2号及从新疆引进的专用青贮玉米品种新青2号为材料，研究了不同青贮玉米的产量形成及其光合生理特性。结果表明，鲜物质、干物质产量以及果穗产量均以粮饲兼用型玉米较高，其中以雅王8号表现最优。粮饲兼用型品种在抽丝后的叶面积指数(LAI)、群体光合势(LAD)和净光合率(NAR)等几个重要生理指标上均表现出明显优势，叶面积指数、群体光合势持续期长、净光合速率高而衰减速率慢是粮饲兼用型品种产量高的重要生理原因。

Studies on Yields Formation and Physiological Characters of Cereal & Silage maize

Two types silage maize, the cereal & silage maize Chuandan 21(CD 21), Chengdan 22(CD 22), Liaoyuanqingzhu 2(LYQZ 2), Yayu 8(YY 8) and typical silage maize Xingqing 2(XQ 2), were chosen to do a comparative experiment. The results indicated that yields of fresh matter, yields of dry matter and yields of ears of the cereal & silage maize were higher than those of typical silage maize, and YY8 was the highest among four cereal & silage maize . In the test, cereal & silage maize had obvious superiorities in LAI, LAD and NAR. The main physiological reasons of high silage yields were of having longer LAI and LAD, higher but slower descent speed of NAR in filling stage.