Effects Of The Physiological Characteristics,Yield And Water And Fertilizer Efficiency On Potato Under Fertigation Modes

In order to explore the differences in potato growth physiology,high yield and high efficiency under different fertigation modes,screen the fertigation model suitable for efficient water-saving planting of potato in the northern foothills of Yinshan,Inner Mongolia.The experimental method of field splitting area was used to study the effect of 9 kinds of the fertigation model constituted with three kinds of irrigation amount about 1200 m~3/hm~2.,2100 m~3/hm~2,3000 m~3/hm~2 and three kinds of fertilization modes of Weidan humic acid fertilizer,Zhonghua large amount of elemental water soluble fertilizer,conventional NPK fertilizer on potato growth Indicators,physiology Indicators,photosynthetic characteristics,water and fertilizer use efficiency and the yield.The main results are as follows:1.The fertigation model based on the conventional NPK fertilization compare with the fertigation model based on the humic acid fertilizer and a large amount of elemental water-soluble fertilizer fertilization.The plant height and stem thickness increase significantly,and the dry accumulation time and rate of whole plants and tubers was rapid,and the each organs dry matter accumulation was increase,the balance period of dry weight and fresh weight of aboveground part and tubers was appear appropriately,and the relationship between stem and leaf growth and tuber growth was coordinated.2.The fertigation model based on the conventional NPK fertilization compare with the fertigation model based on the humic acid fertilizer and a large amount of elemental water-soluble fertilizer fertilization.The LAI was significantly increased,and the SPAD value of leaves was’t significantly different.Under the irrigation of 3000 m~3/hm~2,the Pn of humic acid fertilizer fertilization model was significantly higher than that of other fertilization modes at 60 d after emergence.Under the 1200 m~3/hm~2,2100 m~3/hm~2 irrigation amount,the Ci of conventional NPK fertilizer fertilization fertilization was significantly lower than that of the humic acid fertilizer and the large amount of elemental water soluble fertilizer at 60 d after emergence.3.The fertigation model based on the conventional NPK fertilization compare with the fertigation model based on the humic acid fertilizer and a large amount of elemental water-soluble fertilizer fertilization.The accumulation of NPK in each organ was increased,and the distribution of NPK in each organ is reasonable.4.The fertigation model based on the conventional NPK fertilization compare with the fertigation model based on the humic acid fertilizer and a large amount of elemental water-soluble fertilizer fertilization.the yield significantly increased by 38.95%～46.93%and 35.40%～39.63%,respectively,and the WUE significantly increased by 39.37%～42.96%and 33.83%～44.25%,and the FPF significantly reduced.in fertilizer partial productivity was significantly increased.Compared with 2100 m~3/hm~2 and 3000 m~3/hm~2,the WUE of 1200 m~3/hm~2 was significantly increased by 27.63%～37.56%,49.62%～57.62%,and the difference in yield and FPF was not significant.5.About the potato production in the northern foothills of Yinshan,Inner Mongolia,similar to this experimental conditions,we recommend to use the fertigation model of 1200 m~3/hm~2 combined with conventional NPK fertilizer,which can increase the yield and save water.