非充分补灌对苜蓿地土壤水分和产量的影响

The Effect of Non-full Irrigation to Soil Moisture and Output of Alfalfa Field

2002-2005年在黄土高原西部荒漠草原区研究了补灌对紫花苜蓿土壤水分和产量的影响。结果表明,在非充分补灌条件下,补灌水分主要影响80 cm以上土层的含水量,对80-200 cm土层的水分含量几乎不产生影响,即对土壤最低含水量的影响不大;但补灌量对紫花苜蓿的耗水量和产量的影响显著,补灌量越大,紫花苜蓿的耗水量和产量也越大,说明补灌水分主要用于苜蓿的生长发育消耗。研究还表明,在非充分补灌条件下,紫花苜蓿品种甘农1号、德宝、美国杂花等的产量较好,适宜在黄土高原西部地区种植。

From 2002 to 2005, The effect of non-full irrigation to soil moisture and output of Alfalfa was researched in the western desert grassland areas of Loess Plateau. The results showed that under the non-full irrigation conditions, supplementary water mainly affected moisture of soil that was above 80cm. There was almost no impact on moisture content of the 80-- 200 cm soil. But the amount of supplementary irrigation affected water consumption and yield of alfalfa significantly. The more amount of supplementary irrigation, the more water consumption and yield of alfalfa. It meant that supplementary water mainly was used for alfalfa growth. Zahua from United States, Gannong No. 1 and Debao had high yield under non-full irrigation conditions. These three alfalfa varieties were suitable for western areas of Loess Plateau.