Effect Of Growth, Physiological Characteristics And Water Use Efficiency Under Continuous Regulated Deficit Irrigation At Different Growth Stages Of Peanut

The northwest region of Liaoning Province has the dry climate,sandstorms,water scarcity and poor soil water holding capacity,which seriously affect the local peanut production capacity.In order to alleviate the negative effect of deficit water of the northwest region of Liaoning on peanut production,This experiment using split plot design in Zhangwu AErxiang Town irrigation experimental station.Research the continuous regulated deficit irrigation in different growth periods(flower-pegging stage and pod setting stage)on peanut growth,physiological index,nitrogen content,yield and the influence of water requirement and water use efficiency with drip irrigation under film mulch.To achieve the goals of research to reveal the continuous regulated deficit irrigation in different growth periods(flower-pegging stage and pod setting stage)on peanut physiological mechanism of the effect of water saving and growth control and guarantee the sustainable development of the northwest region of Liaoning Province peanut production areas all has the vital significance.The results that for two consecutive years:(1)The continuous severe regulated deficit irrigation treatment(55%?_f)for different growth periods(flower-pegging stage and pod setting stage)with peanut height less without losing water treatment(70%?_f)reduced by 9.84%,5.77%respectively,shows that severe water deficit inhibited the growth of peanut height.The continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)with peanut height less without losing water treatment(70%?_f)reduced by 1.55%,3.21%respectively,also can effectively inhibited the growth of peanut height,that is advantageous to the peanut forming short seedling.(2)The continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)with the peanut leaf SPAD value of without losing water treatment(70%?_f)increased by 3.18%.The continuous moderate regulated deficit irrigation treatment(65%?f)for different growth periods(flower-pegging stage and pod setting stage)with the net photosynthetic rate of without losing water treatment(70%?_f)increased by 2.75%,1.01%respectively,to improved the peanut leaf transpiration rate and increased the accumulation of photosynthetic products of peanut.(3)The continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)with the water requirement of less loss of without losing water treatment(70%?_f)were 28.90%,21.68%respectively.(4)The continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)with the yield of without losing water treatment(70%?_f)increased by 16.77%,11.75%respectively.The continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)with the water use efficiency is significantly higher than other treatments,its water use efficiency of without losing water treatment(70%?_f)increased by50.51%,35.78%respectively.Experimental results prove that the continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)not only to improve the water deficit to peanut brings negative effect,but also there will be compensation effect.Although the single moderate regulated deficit irrigation treatment(65%?_f)with the water requirement of without losing water treatment(70%?_f)is reduced,the single moderate regulated deficit irrigation treatment(65%?_f)of the lower level is less than the continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)and the single moderate regulated deficit irrigation treatment(65%?_f)of compensation effect is lower than the continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)compensation effect.The continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)in the case of increase production,reduce the water requirement of peanut and improve the water use efficiency.Therefore The continuous moderate regulated deficit irrigation treatment(65%?_f)for different growth periods(flower-pegging stage and pod setting stage)conforms to the area of the northwest Liaoning of the serious situation of water saving.