中国农业科学2011，Vol.44Issue(19)：4015-4021,7.DOI:10.3864/i.issn.0578-1752.2011.19.011
保水剂与氮肥的相互影响及节水保肥效果
Interaction Between Water Retaining Agent and Nitrogen Fertilizers and the Effect of Water and Fertilizer Conservation
摘要
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 NR4+ of the fertilizers dissolved in water. The N amounts of absorbed fertilizers increased with ihe increase of concentrations of fertilizers. However, the rate of N absorbed showed a decrease trend along with the increase of concentrations offertilizers 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.关键词
保水剂/氮肥/相互影响/玉米Key words
water retaining agent (WRA)/nitrogen fertilizer/interaction/maize引用本文复制引用
苟春林,王新爱,李永胜,杜建军,曲东..保水剂与氮肥的相互影响及节水保肥效果[J].中国农业科学,2011,44(19):4015-4021,7.基金项目
国家自然科学基金(30971867) （30971867）
广东省自然科学基金重点项目(10251022501000000) （10251022501000000）
广东省科技计划项目(2008B021000043) （2008B021000043）
教育部留学回国人员科研启动基金(教外司留[2009]1341号) （教外司留[2009]1341号）
