Effects of Irrigation Methods on Soil Available Nutrient state and its
Spatial Heterogeneity in Jujube Ｒoot Zone

China Rural Water and Hydropower ›› 2018 ›› (10) : 125-135.

Effects of Irrigation Methods on Soil Available Nutrient state and its Spatial Heterogeneity in Jujube Ｒoot Zone

HOU Xiao-hua，ZHU Yao-hui，LI Fa-yong，XIA Zi-yang，MENG Xian-gang，JIA Hong-kun

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Available nutrient state in the soil of jujube orchard directly affects crop growth and rational use of water and fertilizer. We had studied the spatial distribution and variation characteristics of soil available nutrients in jujube root area under drip irrigation and flood irrigation. The soil depth of the jujube orchard under 5 years of drip irrigation and flooding was analyzed by sampling and analysis. The results showed that NO3-N in the soil near the root zone decreased gradually with soil depth, and it gradually increased with distance from the root zone in the horizontal direction. Soil NO3 - N was lower at the beginning of growth period, and it increased gradually at the shoot growth stage. The coefficient of variation of NO3-N in drip irrigation and flood irrigation soil decreased with the increase of soil depth and horizontal distance, but drip irrigation decreased more than flood irrigation. During the initial stage of growth period, available N in soil decreased with the increase of soil depth, but the difference of available N in the horizontal direction was not significant, and the available N at the shoot growth stage increased sharply. Irrigation methods had little effect on the heterogeneity of available nitrogen. During the early stage of jujube growth, available potassium in the zone of the jujube root was higher than other soil layers. However, available potassium decreased rapidly at the shoot growth stage. The coefficient of variation of soil available potassium under drip irrigation and flooding conditions decreased with soil depth, but firstly decreased and then increased with horizontal distance. Soil available phosphorus was higher at the beginning of growth period and decreased rapidly at the shoot growth stage. The variation coefficient of drip and flooding irrigation treatments in horizontal direction decreased with the increase of distance, and the variation of drip irrigation was greater than that of flood irrigation. irrigation method had the greatest effect on the spatial distribution and variability of nitrate nitrogen in soil but had little effect on available nitrogen.

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drip irrigation / flood irrigation / nitrate nitrogen / available nitrogen / available potassium / available phosphorus

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HOU Xiao-hua, ZHU Yao-hui, LI Fa-yong, XIA Zi-yang, MENG Xian-gang, JIA Hong-kun. Effects of Irrigation Methods on Soil Available Nutrient state and its Spatial Heterogeneity in Jujube Ｒoot Zone. China Rural Water and Hydropower. 2018, 0(10): 125-135

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Received	Revised	Published
2018-04-08	2018-05-11	2018-10-15
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2019-12-10

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