论文部分内容阅读
苜蓿根系发达,主根一般入土5—6米,深者达10米以上,能较好地利用土壤深层水份,是其耐旱、抗旱的优越条件。因此,年降雨量300—800毫米的地方都能种植苜蓿。苜蓿每形成一份于物质约需700—900份水,需水量比三叶草多1.5倍,比禾本科草多2倍以上。据试验,在苜蓿生育期内,降水不均匀的地区,有水利设施,适时浇水,可促进植株生长发育,增加青、干草和种子产量,增强苜蓿越夏和越冬力,改善土壤物理特性。
Alfalfa roots developed, the main root of the general soil into the 5-6 meters, more than 10 meters deep, can make good use of soil moisture, is its drought, drought conditions. As a result, alfalfa can be grown anywhere from 300 to 800 millimeters. Alfalfa each formed a matter about 700-900 parts of water, water demand more than 1.5 times clover, grass more than 2 times more than grass. According to the experiment, alfalfa growth period, uneven rainfall areas, there are water conservancy facilities, timely watering, can promote plant growth and development, increase green, hay and seed yield, enhance summer overwintering alfalfa and improve soil physical properties.