Nitrogen mineralization in alfalfa stands

Abstract

Abstract: Greenhouse incubation experiments (12 weeks) were used to explore the influence of leaching initial mineral N, N fertilizers, and vegetation coverage on soil nitrogen mineralization of 5- and 9-year alfalfa (Medicago sativa) grasslands in the Qingyang Loess Plateau. The initial mineral N affected N mineralization and the net N mineralization rate increased by 0.05-0.07 mg/(kg·d) after the initial N was taken away. When N fertilization was adopted, the content of NO₃^--N in 5- and 9-year alfalfa grassland increased by 56 and 2 times respectively and net N mineralization rate increased by 200% in 5-year alfalfa grassland, but decreased by 62.5% in 9-year alfalfa grassland. Moreover, planting ryegrass (Lolium perenne) significantly affected N mineralization rate. For instance, net N mineralization rates in treatments with ryegrass were 12 to 18 times higher than in the control, and reached the highest values in the treatment N+Rye, where they were 18 to 25 times higher than in the controls. N mineralization potential in 9-year alfalfa stands was higher than in 5-year alfalfa. In grass-crop rotation systems on the Loess Plateau, succession plants should be sowed immediately after alfalfa is removed as dense plant coverage should reduce the risk of losing NO₃^-and thus enhance N availability in the rainy season.

CLC Number:

HAN Fang-hu, SHEN Yu-ying, WANG Xi, ZHOU Shao-ping, YANG Jing, GENG Li-ying. Nitrogen mineralization in alfalfa stands[J]. Acta Prataculturae Sinica, 2009, 18(2): 11-17.

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