留茬高度对青贮玉米产量和品质的影响

Effect of Stubble Height on Productive Quantities and Qualities of Corn Silage

为了探讨不同留茬高度对青贮玉米的产量和品质的影响,以兼用青贮玉米品种晋单42号为试验材料,在腊熟期分别留茬0cm、15cm、30cm、45cm、60cm刈割取样及青贮后测定其化学成分,并且计算青贮玉米的MILK 2006指数。研究表明,随着留茬高度的提高,青贮玉米产量极显著下降(P<0.01),而养分含量、发酵品质、体外消化率、MILK2006奶吨指数无显著差异,但是奶亩指数差异显著(P<0.01)。综合考虑产量和品质,青贮玉米收获时以留茬15cm为宜。

The effect of cutting height on productive quantities and qualities of corn silage were studied. The JINDAN42 corn hybrid was harvested at 0, 15, 30.45, and 60cm stubble height, sampled and ensiled for analyzing the chemical composition, and the MILK2006 index was calculated. The results indicated that, the productive quantities were decreased significantly （P〈0.01） with the higher cutting height, while the chemical composition, fermentative qualities, in vitro digestibility, and milk per ton index had no significant differences, the different of the milk per mu index was significantly （P〈0.01）. Considering the quantities and qualities, the corn silage should harvest at 15cm stubble height appropriately.