摘要
通过大田试验 ,分析了作物根区局部控水无压地下灌溉条件下不同孔径孔口出水规律和根区局部湿润状况。试验表明 :无压灌溉的灌溉水量主要集中在出水孔周围 2 0 范围内 ,不同的孔口压力能够改变孔口出水量和 0～ 30 土壤储水量 ,从而实现对作物的限水灌溉 ;- 4 和 - 2 供水水平相比 ,番茄的耗水量降低了 2 4 % ,产量减少了 35 % ,水分利用率降低了 19% ,说明 - 4
The outlet flow rate with different aperture diameters and the soil water status of crop root zone under nonpressure subsurface drip irrigation condition were studied in field experiment. The results indicated that irrigation water was chiefly concentrated in 20 cm diameter around water hole,and the outlet water rate and top 0～30cm soil water content were impacted by water pressure, therefore controlling irrigation could be achieved. Compared to -2cm pressure water supply treatment, -4cm treatment decreased water consumption of tomato by 24%, crop yield by 35% and water use efficiency by 19%.Tomato yield was limited by soil moisture in -4cm level obviously.
出处
《沈阳农业大学学报》
CAS
CSCD
2004年第5期393-395,共3页
Journal of Shenyang Agricultural University
基金
国家"8 63"计划项目 (2 0 0 1AA2 4 2 0 51 )
国家重大科技专项项目 (2 0 0 2AA2Z40 31 )
