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| DOI：10.13522/j.cnki.ggps.2019453 |
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| Effects of Straw Interlayers and Different Irrigation Limits on Soil Water and Nitrogen Distribution |
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WU Feng, ZHANG Shuxuan, GUO Xiangping*, CAO Kewen, ZHU Jianbin, WANG Yitian
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College of Agricultural Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| 【Background】At present, water and fertilizer use efficiency is low in many protected cultivation areas in southern China. Studies show that straw interlayers can effectively conserve water and fertilizer.【Objective】In order to investigate the optimal irrigation upper limit above the straw barrier and its effect on soil moisture and nitrogen distribution,【Method】Through the indoor soil column test, the distribution of infiltration soil water and nitrogen under three irrigation upper limits of saturated water content, field water holding capacity, and 80% field water holding capacity at 25 cm depth of straw interlayer were studied.【Result】The result indicated that straw interlayer can inhibit water infiltration and significantly increase the water storage capacity and water storage efficiency of 0~25 cm soil. Under the condition of no evaporation, when the upper limit of irrigation water does not exceed the field water holding capacity, the storage efficiency of 0~25 cm soil water reaches 89%~91% after 6 days. Moreover, straw interlayer can inhibit the deep leakage of nitrate nitrogen. Increase the amount of nitrate nitrogen in 0~25 cm soil. The 80% field water holding capacity irrigation upper limit combined with straw interlayer treatment has a higher nitrate nitrogen content in the 0~25 cm soil layer than other treatments.【Conclusion】The suitable irrigation upper limit above the straw barrier is 80% field water holding rate. |
| Key words: straw interlayer; distribution of water and nitrogen; upper limit of irrigation; infiltration; water storage efficiency |
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