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Soil fertility and crop yield after manure addition to acidic soils in South China.
- Source :
- Nutrient Cycling in Agroecosystems; May2018, Vol. 111 Issue 1, p61-72, 12p
- Publication Year :
- 2018
-
Abstract
- In agro-ecosystems, the relationship between soil fertility and crop yield is mediated by manure application. In this study, an 8-year field experiment was performed with four fertilizer treatments (NPK, NPKM<subscript>1</subscript>, NPKM<subscript>2</subscript>, and NPKM<subscript>3</subscript>), where NPK refers to chemical fertilizer and M<subscript>1</subscript>, M<subscript>2</subscript>, and M<subscript>3</subscript> refer to manure application rates of 15, 30, and 45 Mg ha<superscript>−1</superscript> year<superscript>−1</superscript>, respectively. The results showed that the NPKM (NPKM<subscript>1</subscript>, NPKM<subscript>2</subscript>, and NPKM<subscript>3</subscript>) treatments produced greater and more stable yields (4.95-5.45 Mg ha<superscript>−1</superscript> and 0.59-0.75) than the NPK treatment (4.01 Mg ha<superscript>−1</superscript> and 0.50). Crop yields under the NPKM treatments showed two trends, with a rate of decrease of 0.48-0.83 Mg ha<superscript>−1</superscript> year<superscript>−1</superscript> during the first 4 years and a rate of increase of 0.10-0.25 Mg ha<superscript>−1</superscript> year<superscript>−1</superscript> during the last 4 years. The soil organic carbon (SOC) significantly increased under all treatments. The estimated annual SOC decomposition rate was 0.35 Mg ha<superscript>−1</superscript> year<superscript>−1</superscript> and the equilibrium SOC level was 6.22 Mg ha<superscript>−1</superscript>. Soil total nitrogen (N), available N, total phosphorus (P) and available P under the NPKM treatments increased by 0.15-0.26, 15-33, 0.17-0.66 and 45-159 g kg<superscript>−1</superscript>, respectively, compared with the NPK treatment. Manure application mainly influenced crop yield by affecting the soil TN, available N, and available P, which accounted for up to 64% of the crop yield variation. Taken together, applying manure can determine or at least improve the effects of soil fertility on crop yield in acidic soils in South China. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13851314
- Volume :
- 111
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nutrient Cycling in Agroecosystems
- Publication Type :
- Academic Journal
- Accession number :
- 129020682
- Full Text :
- https://doi.org/10.1007/s10705-018-9918-6