苜蓿草机械化收获叶草比损失试验研究

Experimental Study of Leaf to Stem Losses in Alfalfa Machinery Harvest

叶草比是表征苜蓿草营养的重要参数,为了研究苜蓿草机械化收获中叶草比的损失情况,从而更好的控制苜蓿草中营养物质的损失,通过试验获得割草、搂草、捆草作业前后叶草比、含水率、粗蛋白等主要参数数据,进行了各参数关系研究,验证了国外苜蓿机械化收获损失模型,初步探索和建立了适合中国北方的叶草比损失模型以及粗蛋白损失预测模型。试验结果表明:割―搂―捆过程中,含水率约下降了62.4%,叶草比大约下降了22.5%,粗蛋白含量下降了4.4%,其中损失主要发生在搂草捆草作业中;在建立的叶草比损失模型中,割草损失模型较好,搂草、捆草的叶草比损失模型需要进一步进行参数修正。

Alfalfa is a kind of high-quality forage. During the machinery harvest processing it lost lots of quality and quantity, which directly hinders the economic benefit and the development of China＇s alfalfa industry. The proportion of leaf to stem is a very important parameter for the characterization of the nutritional quality of alfalfa. This paper conducts an experiment of alfalfa machinery harvest including mowing, raking and baling losses in Northern China. By testing and verifying the model that has been done abroad a series of proportion of leaf to stem losses model are derived which in some degree proved to be adaptable in the specific condition in Northern China.