Mitigation effect of several controlled-release N fertilizers on ammonia volatilization and related affecting factors

Abstract

Abstract: By using static absorption and soil column leaching methods,this paper studied the behaviors of several controlled-release N fertilizers in soil under laboratory conditions.The results showed that under the application rate of 450 mg穔g^-1,total ammonia volatilization from three controlled-release fertilizers decreased by 49.7%,28.0% and 71.2%,respectively,in comparing with common urea.When the application rate was 600 mg穔g^-1,total ammonia volatilization decreased by 34.6%,12.3%,69.9%,respectively.Controlled-release fertilizers could markedly reduce total ammonia volatilization from soil and decrease environment pollution via fertilization.The results also indicated that total ammonia volatilization correlated significantly with soil urease activity,pH value and N leaching rate.The correlation coefficient between total ammonia volatilization and accumulated N leaching rate was 0.9533,and that between total ammonia volatilization and soil urease activity and pH value was 0.9533 and 0.9908,respectively.

Key words: Leaching rate, Controlled-release N fertilizer, Ammonia volatilization, Urease activity, pH value

CLC Number:

S143.1
X501

SUN Kejun, MAO Xiaoyun, LU Qiming, JIA Aiping, LIAO Zongwen. Mitigation effect of several controlled-release N fertilizers on ammonia volatilization and related affecting factors[J]. Chinese Journal of Applied Ecology, 2004, (12): 2347-2350.

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