|
| Effects of long-term application of swine manure on soil phosphorus content and inorganic phosphorus components |
| Received:February 22, 2022 Revised:May 16, 2022 |
| View Full Text View/Add Comment Download reader |
| KeyWord:swine manure;soil;inorganic phosphorus;availability phosphorus |
| Author Name | Affiliation | E-mail | | ZHANG Chunlong | College of Resources, Sichuan Agriculture University, Chengdu 611130, China | | | LI Bing | College of Resources, Sichuan Agriculture University, Chengdu 611130, China | benglee@163.com | | HUANG Rong | College of Resources, Sichuan Agriculture University, Chengdu 611130, China | | | TANG Xiaoyan | College of Resources, Sichuan Agriculture University, Chengdu 611130, China | | | XIAO Yi | College of Resources, Sichuan Agriculture University, Chengdu 611130, China | | | BAI Genchuan | College of Resources, Sichuan Agriculture University, Chengdu 611130, China | | | WANG Changquan | College of Resources, Sichuan Agriculture University, Chengdu 611130, China | |
|
| Hits: 660 |
| Download times: 897 |
| Abstract: |
| In order to investigate the change in inorganic phosphorus components in soil and its effects on soil phosphorus availability under long-term application of swine manure, a 7-year field experiment was conducted in a rice-wheat rotation system to determine the effects of swine manure application on soil inorganic phosphorus content and its proportion and soil phosphorus availability. The contribution of soil inorganic phosphorus content to soil phosphorus availability was analyzed using path coefficient and stepwise regression fitting equations. The results showed that long-term application of swine manure could significantly improve soil inorganic phosphorus fractions and phosphorus availability. Six treatments with swine manure phosphorus application rates of（0-1 200 kg · hm-2, P2O5）were evaluated. When the application amount was more than 600 kg·hm-（ 2 M3） , the increase range of soil Olsen-P and phosphorus activation coefficient（PAC）decreased with the increase in application amount, and reached the maximum value in M5（1 200 kg·hm-2）at 86.58 mg· kg-1 and 4.50 percent points, respectively. In terms of soil inorganic phosphorus, soil Ca8-P content and its proportion increased the most, reaching 268.25 mg·kg-1 and 20.73%, respectively. After long-term application of swine manure, the main contribution source of available phosphorus altered from Ca2-P, an easily available phosphorus source, to Ca8-P, a moderately active phosphorus source, and the direct action coefficient of Ca8-P increased from 0.302 to 1.679. Long-term application of swine manure significantly improved the availability of soil phosphorus and the potential of soil phosphorus supply, altered soil inorganic phosphorus fractions, and the contribution source of available phosphorus changed from an easily available to a medium active phosphorus source. However, high soil phosphorus activity may lead to the risk of phosphorus leaching. Therefore, under the conditions of this study, the application amount of phosphorus in swine manure in a rice-wheat rotation system should not be higher than 800 kg·hm-2; the M3（600 kg·hm-2）treatment is relatively better associated with the total rice and wheat yield than the other treatments in this study. |
|
|
|
