Growth of Tomato in Greenhouse under Temporal-spatial Deficit Irrigation
Partial rootzone drying (PRD) has been shown to stimulate stomatal-closure response and improve water-use efficiency.This study was conducted to.compare two water-saving practices,deficit irrigation(DI) and partial rootzone drying(PRD),and also examine how do they affect the growth of greenhouse grown tomato compared with traditional irrigation.A full-irrigated treatment as the control and 5 different irrigation treatments with limited irrigation water were applied to the tomato planted on clay soil.(1)FULL;(2)DI60;(3)DI70,the full amount of irrigation water was applied to the roots to all sides of the plant when the relative soil water content was lowered by 80%,60% and 70%.(4)D150,half of the full amount of irrigation water was applied at the irrigation time of full treatment.(5)1PRDS0;(6)2PRD50,50%deficit irrigation with PRD in which wetted and dry sides of the root zone were interchanged every and every other irrigation,respectively,when the relative soil water content was lowered by 80%;different irrigation practices applied at greenhouse grown tomato had different effects on the yield-related characters and they were examined.Irrigation water applied to tomato ranged between 230mm and 460mm.Both DI and PRD treatments resulted in a significant reduction of dry matter biomass compared to the control.However,since the total water used by transpiration was reduced by half in water deficits treatments;this has resulted in a substantial increase in plant water use efficiency.Although dry matter biomass differences were not statically significant,the highest dry matter biomass was obtained under FULL treatment over a growth period of 188 days after transplanting.Total dry matter biomass was reduced by 7.59%,19.84%,23.30%,21.17%,and 19.57% in DI60,DI70,DI50,1PRD50 and 2PRD50 resperctively compared with FULL treatment. The resulting irrigation-water-use efficiency (IWUE)which was calculated as the ratio of total dry biomass excluding fruit to irrigation water of the full treatment was 11.43kg ha-1.The DI60,DI70,1PRD50,2PRD50 treatments yielded 29.58% ～62.23 higher IWUE,compared with the control treatment.
PRD DI dry matter biomass water use efficiency
Shao Guangcheng Wang Ling Liu Na Chen Shoushan Yin Guoxi
Department of Agricultural Engineering of Hohai University,Nanjing,210098,China Water-saving Park o College of Water Resources and Environment Nanjing,210098,China Business School of Hohai University,Nanjing,210098,China College of Water Resources and Environment Nanjing,210098,China Department of Agricultural Engineering of Hohai University,Nanjing,210098,China
国际会议
南京
英文
579-586
2006-08-16（万方平台首次上网日期，不代表论文的发表时间）