Nitrogen leaching and phosphorus accumulation in a perennial pasture after composted goat manure was topdressed and incorporated in the Three Gorges region

Yanjun Guo, Guangdi Li

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13 Citations (Scopus)

Abstract

For the topdressed treatments, thehighest pasture yields were obtained at 37.5 Mg ha'1 ofcomposted manure applied. As a comparison, the highestpasture yields was obtained at 22.5 Mg ha'1 when compostedmanure was incorporated, further increase of compostedmanure decreased the pasture yields.Conclusions Excess use of composted goat manure significantlyincreased the risk of soil NO3'N leaching and Paccumulation. It is suggested that the composted goat manureshould be incorporated at rate of less than 22.5 Mg ha'1to minimize NO3'N leaching and P accumulation whilemaintaining high pasture production. The split applicationis also recommended to meet the growth requirement ofpastures, hence less NO3'N leaching and soil P accumulation,which is of importance in the Three Gorges region.Purpose Improper utilization of composted manure mightincrease risk of nutrients leaching and phosphorus (P) accumulation,hence causing eutrophication and threatening theecological safety of river. In the current study, compostedmanure from a goat feedlot was applied to a perennialpasture in the Three Gorges region to evaluate its effectson pasture yield, NO3'N leaching, and phosphorus accumulationin soil.Materials and methods Composted goat manure was eithertopdressed by hand or incorporated by hoe in the 0'20 cmsoil depth between rows at four application rates (15, 22.5,30, and 37.5 Mg DM ha'1) and an unamended controlwithout application of composted manure. The compostedmanure was applied five times, with 20 % of the designatedamount each, in July, September, and November 2005 andJanuary and April 2006. A combination leaching'incubationexperiment (soil-resin-core) was conducted to measurethe amount of NO3'N leached from soils.Results and discussion Soil total nitrogen and P concentrationsincreased as amount of composted manure applied wasincreased. Soil NO3'N and NO3'N leached from soil variedacross seasons. Soil available P reached 92, 132, 225, and261 mg kg'1 when 15, 22.5, 30, and 37.5 Mg ha'1 ofcomposted manure was incorporated, respectively, and soilavailable P reached 39, 78, 86, and 132 mg kg'1 forcorresponding treatments for topdressed treatment, indicatingsoil available P accumulated with increased manureapplied. Pasture yield increased as application rate of compostedmanure increased.
Original languageEnglish
Pages (from-to)674-682
Number of pages9
JournalJournal of Soils and Sediments
Volume12
Issue number5
DOIs
Publication statusPublished - May 2012

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