Interactive effects of liming and straw retention on yield and nitrogen uptake in a double rice-cropping system

Shan Huang, Ping Liao, Yanhua Zeng, Qingyin Shang, Yongjun Zeng, Qinghua Shi

MOE and Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang 330045, China. Corresponding author: Shan Huang, Email: ecohs@126.com

Abstract

Although a large body of research has examined the effect of either liming or straw retention on rice yield in acidic soils, their interactive effects are unclear. In the present study, a two-year factorial field experiment was conducted to investigate the interactive effect of liming and straw retention on rice yield and nitrogen (N) uptake in a double rice-cropping system in subtropical China (i.e. rice is cropped twice annually, including early rice and late rice). Results showed that both liming and straw retention could significantly enhance grain yield in both early- and late-rice growing seasons. There were interactive effects of liming and straw retention on late-rice yield in both years, whereas no significant interaction was found in the early-rice growing season. Like grain yield, N uptake of both early- and late-rice was significantly increased by both liming and straw retention. Liming significantly interacted with straw retention to improve N uptake in the late-rice growing season, but not in the early-rice season. Therefore, we conclude that there are synergistic effects of liming and straw retention on late-rice yield in the double rice-cropping system, which may be ascribed to the improvement in rice N uptake.

Host

The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

Photo Credits

David Marland Photography david_marland@hotmail.com Southern Farming Systems Agriculture Victoria

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