Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (19): 4015-4021.doi: 10.3864/j.issn.0578-1752.2011.19.011

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Interaction Between Water Retaining Agent and Nitrogen Fertilizers and the Effect of Water and Fertilizer Conservation

GOU  Chun-Lin, WANG  Xin-Ai, LI  Yong-Sheng, DU  Jian-Jun, QU  Dong   

  1. 1.宁夏农林科学院农产品质量监测中心
    2.仲恺农业工程学院植物营养与新型肥料研究中心
    3.西北农林科技大学资源环境学院
  • Received:2010-07-05 Online:2011-10-01 Published:2010-12-10

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Abstract: 【Objective】 The objective of the experiment is to study the effects of different nitrogen fertilizers on water absorbent characteristics of water retaining agent (WRA), nutrients adsorption by WRA, and the effect of water and fertilizer-conservation when WRA and different nitrogen fertilizers are applied in combination. 【Method】 Water absorbency rates in different solution of urea, ammonium bicarbonate, ammonium sulfate and ammonium chloride were determined by tea bag method. N adsorption capacity was determined by the difference of N amount in the solution before and after adsorption occurred. Maize was used as the tested crop in a pot experiment to study the effect of water and fertilizer conservation when WRA and different nitrogen fertilizers are applied in combination. 【Result】 The results showed that the water absorbent rate of the WRA decreased obviously along with the increase of concentrations of various N fertilizers. The influence of nitrogen fertilizers on water absorbent rate of the WRA was in the order of urea＜ammonium bicarbonate＜ammonium sulfate＜ammonium chloride. While WRA absorbed water, it could absorb the molecules of urea or NH4+ of the fertilizers dissolved in water. The N amounts of absorbed fertilizers increased with the increase of concentrations of fertilizers. However, the rate of N absorbed showed a decrease trend along with the increase of concentrations of fertilizers except urea.WRA and urea or ammonium bicarbonate applied in combination could obviously increase the bioyield, root dry weight, N use efficiency and WUE, as well as net photosynthetic, transpiration rate and stomatal conductance. 【Conclusion】 While WRA absorbed water, it could absorb N nutrient dissolved in water. N fertilizer strongly decreased water absorbent rate of WRA, however, urea was the weakest. WRA and urea applied in combination had the best effect of water and fertilizer control.

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