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

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

Content Provider	Springer Nature Link
Author	Guo, Yanjun Li, Guangdi
Copyright Year	2012
Abstract	Improper utilization of composted manure might increase risk of nutrients leaching and phosphorus (P) accumulation, hence causing eutrophication and threatening the ecological safety of river. In the current study, composted manure from a goat feedlot was applied to a perennial pasture in the Three Gorges region to evaluate its effects on pasture yield, NO$_{3}$–N leaching, and phosphorus accumulation in soil.Composted goat manure was either topdressed by hand or incorporated by hoe in the 0–20 cm soil depth between rows at four application rates (15, 22.5, 30, and 37.5 Mg DM ha$^{−1}$) and an unamended control without application of composted manure. The composted manure was applied five times, with 20 % of the designated amount each, in July, September, and November 2005 and January and April 2006. A combination leaching–incubation experiment (soil-resin-core) was conducted to measure the amount of NO$_{3}$–N leached from soils.Soil total nitrogen and P concentrations increased as amount of composted manure applied was increased. Soil NO$_{3}$–N and NO$_{3}$–N leached from soil varied across seasons. Soil available P reached 92, 132, 225, and 261 mg kg$^{−1}$ when 15, 22.5, 30, and 37.5 Mg ha$^{−1}$ of composted manure was incorporated, respectively, and soil available P reached 39, 78, 86, and 132 mg kg$^{−1}$ for corresponding treatments for topdressed treatment, indicating soil available P accumulated with increased manure applied. Pasture yield increased as application rate of composted manure increased. For the topdressed treatments, the highest pasture yields were obtained at 37.5 Mg ha$^{−1}$ of composted manure applied. As a comparison, the highest pasture yields was obtained at 22.5 Mg ha$^{−1}$ when composted manure was incorporated, further increase of composted manure decreased the pasture yields.Excess use of composted goat manure significantly increased the risk of soil NO$_{3}$–N leaching and P accumulation. It is suggested that the composted goat manure should be incorporated at rate of less than 22.5 Mg ha$^{−1}$ to minimize NO$_{3}$–N leaching and P accumulation while maintaining high pasture production. The split application is also recommended to meet the growth requirement of pastures, hence less NO$_{3}$–N leaching and soil P accumulation, which is of importance in the Three Gorges region.
Starting Page	674
Ending Page	682
Page Count	9
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	12
Issue Number	5
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-03-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Environmental safety Feedlot Pasture yields Perennial pasture Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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