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Science China Life Sciences

, Volume 54, Issue 6, pp 572–579

First Online: 26 June 2011Received: 28 March 2010Accepted: 28 February 2011

Abstract

The sudangrass Sorghum sudanense and ryegrass Lolium multiflorum L. rotation is an intensive and new cropping system in Central China. Nutrient management practices in this rotation system may influence soil fertility, the important aspects of which are soil biological properties and quality. As sensitive soil biological properties and quality indicators, soil microbial community activity, microbial biomass, enzyme activities, soil organic matter SOM and total N resulting from different fertilization regimes in this rotation system were studied through a four-year field experiment from April 2005 to May 2009. Treatments included control CK, fertilizer phosphorus and potassium PK, fertilizer nitrogen and potassium NK, fertilizer nitrogen and phosphorus NP and a fertilizer nitrogen, phosphorus and potassium combination NPK. Soil microbial community activities in the NK, NP and NPK treatments were significantly lower than those in the CK and PK treatments after the sudangrass and ryegrass trial. The highest microbial biomass C, microbial biomass N, SOM, total N, sucrase and urease activities were found in the NPK treatment, and these soil quality indicators were significantly higher in the NK, NP and NPK treatments than in the PK and CK treatments. Soil microbial biomass and enzyme activities were positively associated with SOM in the sudangrass and ryegrass rotation system, indicating that fertilization regimes, especially N application, reduced microbial community activity in the soil. Proper fertilization regimes will increase microbial biomass, enzyme activity and SOM and improve soil fertility.

Keywordsmicrobial activity microbial biomass carbon and nitrogen enzyme fertilization regimes This article is published with open access at Springerlink.com

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Autor: WenXi Li - JianWei Lu - FangBai Li - Yan Wang - JunMing Lu - XiaoKun Li

Fuente: https://link.springer.com/article/10.1007/s11427-011-4175-9







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