Short-term effects of wheat straw incorporation into paddy field as affected by rice transplanting time
J. Ma A C , H. Xu A D , Y. Han A , Z. C. Cai A and K. Yagi BA State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
B National Institute of Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba 305-8604, Japan.
C Graduate University of Chinese Academy of Sciences, Beijing 100049, China.
D Corresponding author. Email: hxu@issas.ac.cn
Australian Journal of Soil Research 46(3) 281-287 https://doi.org/10.1071/SR07113
Submitted: 7 August 2007 Accepted: 5 March 2008 Published: 1 May 2008
Abstract
Short-term effects of wheat straw incorporation into paddy field include stimulation of CH4 emissions, immobilisation of available N, suppression of rice growth, and accumulation of toxic materials. To study these short-term effects as affected by timing of rice transplantation, a field experiment was conducted at Dapu, China, in 2005. Two levels of wheat straw (0 and 3.75 t/ha) and 2 rice-transplanting times (normal and delayed) were adopted in this experiment. Methane emissions, concentrations of soil mineral N, dry matter accumulations, and grain yields were measured. Delayed rice transplantation had no effect on total CH4 emission from paddy fields incorporated with wheat straw (P > 0.05), but a significant effect on mineralisation of N (P < 0.05), in contrast to the net N immobilisation in the fields where seedlings were transplanted on the normal date. In paddy fields incorporated with wheat straw, delayed transplantation tended to promote rice growth and increase grain yield compared with transplantation on the normal date.
Additional keywords: CH4 emission, dry matter accumulation, grain yield, N immobilization.
Acknowledgments
This work was funded by the National Natural Science Foundation of China (grant Nos. 40621001 and 40671094). This research was also supported by ‘Global environment research fund’ S-2-3a of the Ministry of the Environment, Japan.
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