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Effects of fertigation strategies on water and nitrogen distribution under water storage pit irrigation for orchards

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International Journal of Agricultural and Biological Engineering 2018年第1期11卷 165-171页

作者： Jingling Li Pan Chen Xihuan Sun Ping Liu College of Water Resource Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Water storage pit(WSP)irrigation is a simple and inexpensive technology suitable for orchards in semiarid and arid regions of North *** study compared the effects of different fertigation strategies on water and nitrogen distribution,and ammonia volatilization.A fertigation experiment was conducted using a 30°wedge-shaped plexiglass soil container,which represents one-twelfth of the complete storage *** height of the container was 120 cm,and a plexiglass damper for simulating the zero flux plane of adjacent water storage pits was located at the 40 cm *** fertigation strategies were used for WSP irrigation:solution application during the first half(N-W),the last half(W-N),the middle half of an irrigation cycle(W-N-W),and during the entire irrigation(N-N).Surface(SF)irrigation was used as a control treatment with solution application during the entire irrigation(SN-N).The experimental results showed that the soil water and ammonium contents at 0-10 cm soil depth under WSP irrigation were only 10.51%and 18.42% of those under SF irrigation,*** cumulative NH3 volatilization under WSP irrigation was 51.71%-68.72% lower compared with that under SF *** soil water distributions were similar for all four fertigation ***3 volatilization mainly occurred at the pit wall interface,and cumulative NH3 volatilization loss followed the trend N-N>W-N>W-N-W>*** was adsorbed into the soil and thus mostly remained near the pit *** concentrations of ammonium were found near the edge of the wetting zone under all *** to N-W,N-N and W-N-W treatments,W-N treatment decreased the nitrate accumulation at 80-90 cm by 38.6%,19.0%and 10.3%,*** W-N strategy was suggested for minimizing potential nitrate leaching.

关键词： water storage pit fertigation soil water nitrogen distribution orchards irrigation

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