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| DOI： |
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| Effect of Water Retaining Material on Soil Nitrate Nitrogen and Ammonium Nitrogen Dynamic Change in Hetao Irrigation Area |
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ZHAO Chunxiao, ZHENG Haichun, YANG Yanming, HONG Mei, GAO Fanshen
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College of Agronomy, Inner Mongolia Agricultural University， Hohht 010018, China; Inner Mongolia Soil and Fertilizer Work station, Hohht 010010, China
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| Abstract: |
| To study non-point source pollution detection and control measures of Hetao irrigation area of Inner Mongolia agricultural, chemical fertilizer field soil leaching tests were used and soil nitrate nitrogen and ammonium nitrogen dynamic change in the Hetao irrigation farmland under the water-retaining material processing were analyzed. The results showed that water-retaining material could effectively adsorb NO3--N and NH4+-N leaching amount in shallow soil and it could reduce nutrient leaching. So it had the protecting of fertilizer applied delay effect. Compared to CK, soil NO3--N accumulation amount of water-retaining material processing treatments increased by 20.49% in corn seedling period, but increased by 13.98% on average in the harvest period; Soil NH4+-N accumulation amount increased by 35.21% on average, but increased by 28.93% on average in the harvest period. Water-retaining material effectively inhibited nitrogen leaching losses and improved the utilization rate of nitrogen. At the same time, it could guarantee the effective nitrogen supply of following corn stage and avoid a large number of accumulations in a short time. So to a certain extent, water-retaining material reduces the fertilizer non-point source pollution and provides the effective measures for agricultural pollution control. |
| Key words: water saving materials; residue in soil; nitrogen utilization rate; nutrient leaching loss |
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