粮饲兼用型玉米青贮产量形成及调控研究

试验选用了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、燎原青贮玉米2号与从新疆引进的专用青贮玉米品种新青2号作对比试验,研究其产量形成规律及适宜的种植密度与收割时期。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,其中以雅玉8号表现最优;适宜的种植密度为127500株/hm2;粮饲兼用型青贮玉米的适宜收获期在抽丝后35～42d,专用型青贮玉米新青2号在抽丝后28～35d。

Effects of Silage Yields Development and Regulation on Foodstuff Maize

Two types silage maize, the foodstuff maize Chuandan21(CD21), Chen gdan22(CD22), Liaoyuanqingzhu2(LYQZ2), Yayu8(YY8) and typical silage maize Xingq ing2(XQ2), were chosen to study the development of silage yields, optimum plant- density and harvesting time. The results indicated that yields of fresh matter, yields of dry matter and yields of ears the foodstuff maize were higher than typ ical silage maize, and YY8 was the highest of four foodstuff maize. In the test, The optimum plant density and harvesting time were selected, 127 500 plants/ha was the optimum plant-density of silage maize, the foodstuff maize could be harv ested in 35 - 42 days after silking, the typical silage maize could be harvested in 28 - 35 days after silking.