A LYSIMETER STUDY FOR LEACHING LOSSES, SUSTAINABLE FERTILIZATION, AND GROWTH RESPONSES OF CORN (ZEA MAYS L.) FOLLOWING SOIL AMENDMENT WITH A WATER-SAVING SUPERABSORBENT POLYMER

文献类型： 外文期刊

第一作者： Islam, M. Robiul

作者： Islam, M. Robiul;Mao, S.;Xue, X.;Islam, M. Robiul;Mao, S.;Hu, Y.;Islam, M. Robiul;Alam, A. M. Shahidul;Eneji, A. Egrinya

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关键词： Corn; Drought stress; Lysimeter study; Optimum fertilization; Superabsorbent polymer

期刊名称：APPLIED ENGINEERING IN AGRICULTURE （ 影响因子：0.985； 五年影响因子：1.02 ）

ISSN： 0883-8542

年卷期： 2011 年 27 卷 5 期

页码：

收录情况： SCI

摘要： Nitrate leaching and the resulting ground water contamination from intensive cereal production has become a major concern for long-term farmland efficiency and environmental sustainability in northern China. The aim of this study was to evaluate a water-saving superabsorbent polymer for minimizing nutrient leaching from soil and optimizing corn growth and yield. Twenty-four undisturbed soil lysimeters (35-cm diameter and 150-cm depth) were installed in a field lysimeter facility in drought affected northern China to study the growth and yield characteristics of summer corn (Zea mays L.) as well as soil fertility and the amount of nutrient (NO3-N, P, and K) leaching losses under different fertilizer (standard, medium, or 75% and low, or 50% of conventional fertilization rate) treatments with (30 kg ha(-1)) or without the application of SAP. Corn yield fell by 19.7% under medium and 37.7% under low fertilization; the application of SAP increased it significantly by 80.3%. Similarly intercellular carbon dioxide concentration, net photosynthesis and transpiration rate, relative water contents in the leaves as well as available nutrient elements in the soil also increased with SAP treatment. Application of SAP at 30 kg ha(-1) plus only half of conventional fertilization can provide the same yield at the same cost but reduce nitrate leaching significantly by 64.1% compared with conventional (excessive) fertilization. At the same time P and K leaching can be reduced significantly by 12.6% and 36.8%. Application of SAP at 30 kg ha(-1) plus half the amount of conventional fertilizer rate (150-kg urea, and 50 kg each of superphosphate and potassium sulfate) would be a more appropriate practice both for minimizing nutrient leaching and sustainable corn production under the arid and semiarid conditions of northern China.

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