| Dynamic changes of N，P，K contents in aboveground alfalfa with different farming modes |
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| DOI：10.7606/j.issn.1000-7601.2005.01.17 |
| Key Words: farming mode alfalfa N, P and K contents dynamic changes |
| Author Name | Affiliation | | LI Li-xia | Northwest Sci-tech University of Agriculture and Forestry,Resource and Environment College Yangling,Shaanxi 712100,China | | HAO Ming-de | nstitute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China | | ZHANG Chun-xia | Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China；Changsha Environmental Protection College,Changsha,Hunan 410004,China |
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| Abstract: |
| According to the 18-year fertilizer experiment, the paper discusses and analyzes the dynamic changes in alfalfa at different growth stages with different farming modes. The results showed that the N contents of alfalfa under different fertilizations did not significantly differ, but the P content obviously increased; the use of only P fertilizers could not significantly change the N content in alfalfa. In alfalfa rotation, the N contents of alfalfa with different growing lengths tended to decline while in the aboveground part of alfalfa, the P and K contents varied in different patterns and the K content increased as alfalfa grew longer and longer. |
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