Improvement of straw decomposition and rice growth through co-application of straw-decomposing inoculants and ammonium nitrogen fertilizer

BMC Plant Biology

Research

Wei Liu¹  Dahong Zhang¹  Xun Jiang¹  Jichao Tang¹  Bilin Lu²  Wenjia Yang² 

[1] Hubei Collaborative Innovation Center for Grain Industry, Agricultural College, Yangtze University, Jingmi Road No. 88, 434025, Jingzhou, Hubei, China;Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, 434025, Jingzhou, Hubei, China;Hubei Collaborative Innovation Center for Grain Industry, Agricultural College, Yangtze University, Jingmi Road No. 88, 434025, Jingzhou, Hubei, China;Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, 434025, Jingzhou, Hubei, China;Hubei Provincial Key Laboratory of Waterlogged Disasters and Agricultural, Use of Wetland Yangtze University, 434025, Jingzhou, Hubei, China;

关键词: Straw decomposition;    Straw-decomposing inoculants;    Ammonium bicarbonate;    Rice yield;   

DOI  :  10.1186/s12870-023-04254-3

 received in 2023-01-04, accepted in 2023-04-27,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundThe growth of rice is reduced by the slow decomposition of accumulated straw, which competes with rice for soil nitrogen nutrient. In recent year, straw-decomposing inoculants (SDIs) that can accelerate straw decomposition and ammonium nitrogen (N) fertilizer that can quickly generate available N is increasingly adopted in China. However, it is still unknown whether the N demand of straw decomposition and crop growth can be simultaneously met through the co-application of SDIs and ammonium N fertilizer.ResultsIn this study, we investigated the effect of the co-application of SDIs and ammonium bicarbonate on decomposition rate of wheat straw, rice growth and rice yield over two consecutive years in rice-wheat rotation system. Compound fertilizer (A0) was used as control. The ratios of ammonium bicarbonate addition were 20% (A2), 30% (A3) and 40% (A4), respectively, without SDIs or with SDIs (IA2, IA3, IA4). Our results revealed that without SDIs, compared with A0, straw decomposition rate, rice growth and yield were improved under A2; However, under A3, rice yield was decreased due to the slow decomposition rate of straw and limited growth of rice during late growth stage. Combining SDIs and N fertilizer increased straw decomposition rate, rice growth rate and yield more than that of N fertilizer alone, especially under IA3. Compared with A0, straw decomposition rate, tiller number, aboveground biomass, leaf area index, root length, and nitrogen use efficiency were significantly increased by 16%, 8%, 27%, 12%, 17%, and 15% under IA3. Consequently, the average rice yield of IA3 was increased to 10,856 kg/ha, which was 13% and 9% higher, respectively, than of A0 and A2.ConclusionOur results indicated that ammonium bicarbonate application alone carried a risk of nutrient deficiency during late growth stage and yield decline. Therefore, the co-application of SDIs and 30% ammonium N fertilizer substitution can be a favorable practice to simultaneously accelerate straw decomposition and increase rice crop growth.

【 授权许可】

CC BY   
© The Author(s) 2023

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