|
| Nitrogen and phosphorus runoff losses during rice-garlic rotation in Erhai Lake basin under different fertilization methods |
| Received:April 11, 2017 |
| View Full Text View/Add Comment Download reader |
| KeyWord:Erhai Lake;fertilization method;rice-garlic rotation;nitrogen and phosphorus reduction |
| Author Name | Affiliation | E-mail | | YAO Jin-ling | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHANG Ke-qiang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Dali Agro-Environmental Science Station, Ministry of Agriculture, Dali 671004, China | | | GUO Hai-gang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Hebei University of Engineering, Handan 056038, China | | | WANG Feng | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Dali Agro-Environmental Science Station, Ministry of Agriculture, Dali 671004, China | | | ZHANG Gui-long | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | REN Tian-zhi | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | rentianzhi@caas.cn |
|
| Hits: 3473 |
| Download times: 3014 |
| Abstract: |
| Rice-garlic rotation is the most common planting pattern in the Erhai Lake basin. Nitrogen and phosphorus runoff losses under conventional fertilization methods are the main factors that contribute to water eutrophication in Erhai Lake. In this experiment, the effects of different fertilization methods on the yields of rice and garlic and the surface runoff losses of soil nitrogen and phosphorus were studied. The results showed that when nitrogen fertilizer input amount was equal, the yields of rice and garlic under the treatments of 50% organic-inorganic fertilizer(50%O) and 100% slow-release bulk blending fertilizer(100%BB) were not significantly different from those of conventional fertilization(CF), whereas those of 100% organic fertilizer(100%O) treatment were significantly lower. The agronomic efficiencies of nitrogen and phosphorus for rice under CF and 50%O treatments were significantly higher than those of other treatments. The agronomic nitrogen use efficiencies for garlic under the addition of CF and 50%O were significantly higher than those under other treatments, but the highest agronomic phosphorus use efficiency for garlic was obtained under 100%BB treatment. During the rice season, the runoff loss amounts and loss rates of nitrogen and phosphorus under 100%BB treatment were the lowest, resulting in 55.34% and 86.95% reduction, respectively, for nitrogen, and 70.14% and 89.07% reduction, respectively, for phosphorus, compared with CF treatment. The runoff losses of nitrate nitrogen and ammonium nitrogen were 13.19%~21.69% of that of total nitrogen losses, whereas 83.25%~90.93% of total phosphorus losses were soluble phosphorus. |
|
|
|
