论文部分内容阅读
二、牧草的特征和特性 栽培牧草是由野生牧草引种驯化而来。大约在2000年前,紫花苜蓿即已成为人工栽种的优良牧草。聚合草由野草变成栽培牧草只有200多年的历史。垂穗披碱草和老芒麦的栽培仅有20多年。野生牧草引入栽培后落粒性强,不易收到种子,播种后发芽不整齐,生产能力低,即不如在天然条件下生长得好。原因是人们还不完全掌握它的特性。要使牧草栽培好,首先要满足它的遗传性要求。所谓驯化工作,一方面是鉴定选择的过程,另一方面是研究生活条件的过程。
Second, the characteristics and characteristics of pasture cultivation of forage grass is introduced by the introduction of wild grass from. About 2000 years ago, alfalfa has become a man-made good pasture. Aggregation of grass from weeds into cultivated pastures only 200 years of history. Ears Elymus and Sarkosiposcemus cultivation only 20 years. After introduced into the cultivation of wild pasture, there is a strong drop of grain, which makes it hard to receive seeds. After planting, it has irregular germination and low productivity, which means it is better to grow well under natural conditions. The reason is that people still do not fully grasp its characteristics. To make forage cultivation, we must first meet the hereditary requirements. The so-called domestication work, on the one hand, is to identify the process of selection, on the other hand, to study the process of living conditions.