| Autor: |
LIU Lei, LIAO Ping, SHAO Hua, LIU Jin-Song, YANG Xing-Lian, WANG Jing, WANG Hai-Yuan, ZHANG Jun, ZENG Yong-Jun, HUANG Shan |
| Zdroj: |
Acta Agronomica Sinica; 2022, Vol. 48 Issue 1, p226-237, 12p |
| Abstrakt: |
Soil acidification and potassium (K) deficit are two important factors limiting crop productivity in acidic paddy soils. Lime application and straw return are effective measures to alleviate soil acidification and improve soil K content, but their interaction effect on K balance is still unclear. A four-year field experiment including two factors (liming and straw return) was conducted in Shanggao, Jiangxi province from 2015 to 2018. Four treatments were arranged in this experiment: (1) Straw removal without liming; (2) Straw removal with lime application only once in 2015; (3) 100% straw return every season without liming; (4) Straw return combined with lime application only once in 2015. Straw return significantly improved rice K uptake, while liming only significantly increased K uptake in late rice in 2016. There were positive interactive effects between liming and straw return on K uptake in late rice in 2016. Liming significantly improved K uptake by 25.7% under straw return in late rice in 2016, but there was no significant effect under straw removal. Neither liming nor straw return significantly affected soil total K concentration. However, the apparent balance of soil K in four years indicated the apparent balance of soil total K was surplus under straw return, while it was deficit under straw removal not returning, and lime application had not significant effect on it. Straw return enhanced soil cumulative apparent K surplus by 19.5 kg hm-2 a-1 and 29.0 kg hm-2 a-1 with liming and without liming, respectively. Soil cumulative apparent K balance showed a surplus of 24.3 kg hm-2 a-1 under straw return and a deficit of 185.8 kg hm-2 a-1 under straw removal. In summary, lime application combined with straw return could simultaneously alleviate soil acidification and maintain K balance, which is conductive to continuously improve the productivity of double rice cropping in acidic paddy fields. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
