老芒麦需水特性及灌溉效果的研究

Studies on Siberian Wildrye's Water Demand and Irrigation Efficiency

试验结果表明:生长第一年的老芒麦每形成1kg干物质需消耗0.56m3水,生长第二年需消耗0.498m3水,每形成1kg种子需要消耗水分2.766m3;老芒麦生长第一年耗水量最多在抽穗阶段,需水强度达94.35m3/hm2·d;生长第二年耗水最多在拔节到抽穗期,需水强度最高达122.1m3/hm2·d;全生育期灌水4～5次,每公顷灌溉定额2550～3000m3为好。

An experiment shows that it takes 0.56 m^3 of water for Siberian wildrye to produce 1 kg of hay in the first year,and 0.498 m^3 of water to do the same in the second year. It takes 2.766 m^3 of water for the grass to produce 1 kg of seed. The first year's highest water consumption period falls on the heading stage,which amounts to 94.35 m^2/hm^2 a day.The second year's highest water consumption period lasts from the stem pushing to be heading stage,amounting to 122.1 m^3/hm^2 per day.During the growth stage Siberian wildrye needs to the watered four to five times,preferably 2550～3000 m^3/hm^2 each time to meet the need of the grass during its growing stage.