Effects Of Deficient Irrigation On Potato Plant Growth And NUE Under Drip Irrigation

To research the effects of insufficient irrigation on potato plant growth and development and nitrogen use efficiency, two years field experiments conducted in Inner-Mongolia. In2011, experimental design emphasized that insufficient irrigation happened in different plant growth stage and measurements concluded soil water content in different soil layers, potato root space distribution, leaf area index, plant dry matter accumulation, tuber yield and yield characters. In2012, to research the effects of irrigation volume on soil water content in different soil layers, different volumes of insufficient irrigation happened in the same soil water content condition at sprout stage, and keep the soil water content at lower water content limit at tuber forming stage, tuber bulking stage and starch accumulation stage. Results showed that,1the time of insufficient irrigation occurrence had an effect on plant leaf area, dry matter accumulation and tuber yield, and plants were most sensitive to water at tuber bulking stage, at this stage, if insufficient water occurred, plants got a heavy drop yield. While it was benefit for plant population structure forming and carbohydrates distribution if insufficiency irrigation (lower limit of soil water content higher than55%) occurred at sprout stage, then benefit for yield improvement.2through regression analysis of2012data, the lower limit of optimal relative soil water content were,55%at sprout stage,76%tuber forming stage,77%bulking stage and58%starch accumulation stage.3it had little effect and had no regulars of relative soil water content on nutrient distribution in plant different organs, and had significant effects on nutrient accumulation and PFP, and it was proper to keep the lower limit of relative soil water content were55%at sprout stage,70%tuber forming stage,75%bulking stage,60%starch accumulation, and when harvest, the plant nutrient accumulation were5.58g N,2.4g P,5.5g K; and the PFP (partial fertilizer productivity) were254.4kg/kg N,290.75kg/kg P,203.52kg/kg.