Nitrogen and phosphorus fertilizations alter nitrogen,phosphorus and potassium resorption of alfalfa in the Loess Plateau of China |
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| Authors: | Jiaoyun Lu Mei Yang Minguo Liu Yixiao Lu |
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| Institution: | State Key Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P. R. China |
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| Abstract: | AbstractNutrient resorption from senescing leaves is a pivotal component of nutrient conservation strategy in a plant. Thus understanding the response of nutrient resorption to fertilization is of great help to minimize fertilizer use and further optimize fertilization management. However, little is known about how nutrient resorption responds to fertilization in N2-fixing species. Nitrogen (N) and phosphorus (P) fertilizers were applied at different rates to alfalfa stands in the Loess Plateau. N fertilization hardly affected leaf N and K resorptions, but tended to increase P resorption. P fertilization increased N and K resorptions but affected P resorption in various ways. However, effect of N or P fertilization was significantly interplayed by P or N rate. At N100P60, alfalfa had the maximum biomass accumulation and less leaf resorption. Therefore, alfalfa could be performed well with 100?kg N ha?1 and 60?kg P2O5 ha?1 in this region. |
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| Keywords: | Medicago sativa N and P fertilization nutrient resorption internal nutrient cycling Loess Plateau of China |
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