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Acta Agronomica Sinica ›› 2020, Vol. 46 ›› Issue (01): 84-92.doi: 10.3724/SP.J.1006.2020.92016

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

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

LIAO Ping1,LIU Lei1,HE Yu-Xuan1,TANG Gang1,ZHANG Jun2,ZENG Yong-Jun1,WU Zi-Ming1,HUANG Shan1,*()   

  1. 1 Ministry of Education and Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang 330045, Jiangxi, China
    2 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2019-04-01 Accepted:2019-08-09 Online:2020-01-12 Published:2019-09-03
  • Contact: Shan HUANG E-mail:ecohs@126.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(31701383);National Key Research and Development Program of China(2018YFD0301102)

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Abstract:

Soil acidification and low fertility limit crop productivity in red paddy soils. Liming and straw incorporation are effective practices to alleviate soil acidification and improve soil fertility, respectively, while their interaction is still unclear. A four-year field experiment was conducted in a double rice cropping system with red paddy soil in Jiangxi province to examine the interactive effect of liming and straw incorporation on rice yield and nitrogen (N) uptake from 2015 to 2018. Either liming or straw incorporation increased grain yield and N uptake in both early and late rice seasons. Lime application increased yield and N uptake by 10.7% and 15.5% under straw incorporation, while by 4.4% and 9.7% with straw removal in the early rice season, respectively. In contrast, liming enhanced yield and N uptake by 18.7% and 24.6% in the straw-incorporated treatments in the late rice season, respectively, whereas only by 10.5% and 5.7% in the straw-removed treatments. The effect of liming on enhancing grain yield, N uptake and soil pH for both early and late rice diminished in the present of time. Neither soil organic matter nor total N content was significantly affected by liming after the four-year experiment. Straw incorporation significantly increased soil organic matter, but had no effect on total N. Therefore, limes should be applied along with straw incorporation to simultaneously increase double rice yield, alleviate soil acidification, and improve soil fertility on acidic paddies. Besides, our results suggest that limes should be applied approximately every four years in the double rice cropping system with acidic red soil.

Key words: soil acidification, straw incorporation, liming, double rice, grain yield, nitrogen uptake

Table 1

Effects of liming and straw incorporation on grain yield and its components, and N uptake in early rice (F-values) "

变异来源
Source of variations		 有效穗
Effective panicle		 每穗粒数
Spikelets per panicle		 结实率
Seed-setting rate		 千粒重
1000-grain weight		 产量
Grain yield		 氮素吸收
N uptake
石灰 Liming (L) 16.0** 20.1** 0.2 1.3 33.5** 48.0**
秸秆还田 Straw incorporation (RS) 154.2** 15.6** 7.8** 0 111.3** 133.5**
年份 Year (Y) 100.0** 7.9** 87.8** 11.8** 64.1** 111.0**
石灰×秸秆还田 L×RS 3.0 1.0 0.9 0.6 7.2* 4.8*
石灰×年份 L×Y 2.1 3.4* 3.6* 0.3 4.6** 5.4**
秸秆还田×年份 RS×Y 1.4 4.8** 1.6 1.1 4.7** 5.2**
石灰×秸秆还田×年份 L×RS×Y 0.2 0.5 0.5 0.3 1.2 1.6

Fig. 1

Effects of liming and straw incorporation on grain yield and its components, and N uptake in early rice (2015-2018) CK, L, RS, and L+RS mean control, liming, straw incorporation, and straw incorporation with liming, respectively. Error bars represent the standard deviation of the mean (n = 3). Bars superscripted by different letters are significantly different at P < 0.05 in the same year."

Table 2

Effects of liming and straw incorporation on grain yield and its components, and N uptake in late rice (F-values) "

变异来源
Source of variations		 有效穗
Effective panicle		 每穗粒数
Spikelets per panicle		 结实率
Seed-setting rate		 千粒重
1000-grain weight		 产量
Grain yield		 氮素吸收
N uptake
石灰 Liming (L) 94.3** 45.2** 1.1 9.7** 125.7** 93.1**
秸秆还田 Straw incorporation (RS) 0.9 69.5** 22.2** 0.4 18.4** 65.7**
年份 Year (Y) 67.8** 15.6** 37.7** 11.5** 49.4** 26.1**
石灰×秸秆还田 L×RS 25.9** 0.4 0.6 0.3 10.4** 38.0**
石灰×年份L×Y 10.3** 5.5** 2.2 1.1 20.8** 15.2**
秸秆还田×年份RS×Y 2.3 3.6* 7.5** 1.9 0.7 10.3**
石灰×秸秆还田×年份 L×RS×Y 6.5** 0.1 0.7 0.2 1.2 6.1**

Fig. 2

Effects of liming and straw incorporation on grain yield and its components, and N uptake in late rice (2015-2018) Abbreviations are the same as those given in Fig. 1. Error bars represent the standard deviation of the mean (n = 3). Bars superscripted by different letters are significantly different at P < 0.05 in the same year."

Fig. 3

Effects of liming and straw incorporation on annual yield (a), annual N uptake (b), total yield (c), and total N uptake (d) over the 4-year Abbreviations are the same as those given in Fig. 1. Error bars represent the standard deviation of the mean (n = 3). Bars superscripted by different letters are significantly different at P < 0.05 in the same year."

Fig. 4

Effects of liming and straw incorporation on soil pH (2015-2018) Abbreviations are the same as those given in Fig. 1. Error bars represent the standard deviation of the mean (n = 3). Bars superscripted by different letters are significantly different at P < 0.05 in the same year."

Fig. 5

Effects of liming and straw incorporation on soil organic matter (a) and total N content (b) (2018) Abbreviations are the same as those given in Fig.1. Error bars represent the standard deviation of the mean (n = 3). Bars superscripted by different letters are significantly different at P < 0.05 in the same year."

[1] Liu S L, Pu C, Ren Y X, Zhao X L, Zhao X, Chen F, Xiao X P, Zhang H L . Yield variation of double-rice in response to climate change in Southern China. Eur J Agron, 2016,81:161-168.
doi: 10.1016/j.eja.2016.09.014
[2] Guo J H, Liu X J, Zhang Y, Shen J L, Han W X, Zhang W F, Christie P, Goulding K W, Zhang F S . Significant acidification in major Chinese croplands. Science, 2010,327:1008-1010.
doi: 10.1126/science.1182570 pmid: 20150447
[3] Miao Y X, Stewart B A, Zhang F S . Long-term experiments for sustainable nutrient management in China: a review. Agron Sustain Dev, 2011,31:397-414.
doi: 10.1051/agro/2010034
[4] 徐仁扣, 李九玉, 周世伟, 徐明岗, 沈仁芳 . 我国农田土壤酸化调控的科学问题与技术措施. 中国科学院院刊, 2018,33:160-167.
Xu R K, Li J Y, Zhou S W, Xu M G, Shen R F . Scientific issues and controlling strategies of soil acidification of croplands in China. China Acad J Electr Publish House, 2018,33:160-167 (in Chinese with English abstract).
[5] Holland J E, Bennett A E, Newton A C, White P J, McKenzie B M, George T S, Pakeman R J, Bailey J S, Fornara D A, Hayes R C . Liming impacts on soils, crops and biodiversity in the UK: a review. Sci Total Environ, 2018,610:316-332.
doi: 10.1016/j.scitotenv.2017.08.020 pmid: 28806549
[6] Jiang Y, Liao P, van Gestel N, Sun Y N, Zeng Y J, Huang S, Zhang W J, van Groenigen K J . Lime application lowers the global warming potential of a double rice cropping system. Geoderma, 2018,325:1-8.
doi: 10.1016/j.geoderma.2018.03.034
[7] Ai C, Liang G Q, Sun J W, He P, Tang S H, Yang S H, Zhou W, Wang X B . The alleviation of acid soil stress in rice by inorganic or organic ameliorants is associated with changes in soil enzyme activity and microbial community composition. Biol Fert Soils, 2015,51:465-477.
doi: 10.1007/s00374-015-0994-3
[8] Liao P, Huang S, van Gestel N, Zeng Y J, Wu Z M, van Groenigen K J . Liming and straw retention interact to increase nitrogen uptake and grain yield in a double rice-cropping system. Field Crops Res, 2018,216:217-224.
doi: 10.1016/j.fcr.2017.11.026
[9] Wang B, Shen X, Chen S, Bai Y C, Yang G, Zhu J P, Shu J C, Xue Z T . Distribution characteristics, resource utilization and popularizing demonstration of crop straw in Southwest China: a comprehensive evaluation. Ecol Indic, 2018,93:998-1004.
doi: 10.1016/j.ecolind.2018.05.081
[10] 张国, 逯非, 赵红, 杨广斌, 王效科, 欧阳志云 . 我国农作物秸秆资源化利用现状及农户对秸秆还田的认知态度. 农业环境科学学报, 2017,36:981-988.
Zhang G, Lu F, Zhao H, Yang G B, Wang X K, Ou-Yang Z Y . Residue usage and farmers’ recognition and attitude toward residue retention in China's croplands. J Agro-Environ Sci, 2017,36:981-988 (in Chinese with English abstract).
[11] Li H, Dai M W, Dai S L, Dong X J . Current status and environment impact of direct straw return in China’s cropland-A review. Ecotox Environ Safe, 2018,159:193-300.
[12] Han X, Xu C, Dungait J A, Bol R, Wang X J, Wu W L, Meng F Q . Straw incorporation increases crop yield and soil organic carbon sequestration but varies under different natural conditions and farming practices in China: a system analysis. Biogeosciences, 2018,15:1933-1946.
doi: 10.5194/bg-15-1933-2018
[13] Singh B, Shan Y H, Johnson-Beebout S E, Singh Y, Buresh R J . Crop residue management for lowland rice-based cropping systems in Asia. Adv Agron, 2008,98:117-199.
[14] 曾研华, 吴建富, 曾勇军, 范呈根, 谭雪明, 潘晓华, 石庆华 . 机收稻草全量还田减施化肥对双季晚稻养分吸收利用及产量的影响. 作物学报, 2018,44:454-462.
doi: 10.3724/SP.J.1006.2018.00454
Zeng Y H, Wu J F, Zeng Y J, Fan C G, Tan X M, Pan X H, Shi Q H . Effects of straw incorporation with reducing chemical fertilizers on nutrient absorption and utilization and grain yield of double-cropping late rice under mechanical harvest. Acta Agron Sin, 2018,44:454-462 (in Chinese with English abstract).
doi: 10.3724/SP.J.1006.2018.00454
[15] Pan F F, Yu W T, Ma Q, Zhou H, Jiang C M, Xu Y G, Ren J F . Influence of 15N-labeled ammonium sulfate and straw on nitrogen retention and supply in different fertility soils . Biol Fert Soils, 2017,53:303-313.
doi: 10.1007/s00374-017-1177-1
[16] 孟红旗, 刘景, 徐明岗, 吕家珑, 周宝库, 彭畅, 石孝均, 黄庆海, 王伯仁 . 长期施肥下我国典型农田耕层土壤的pH演变. 土壤学报, 2013,50:1109-1116.
Meng H Q, Liu J, Xu M G, Lyu J L, Zhou B K, Peng C, Shi X J, Huang Q H, Wang B R . Evolution of pH in top soils of typical Chinese croplands under long-term fertilization. Acta Pedol Sin, 2013,50:1109-1116 (in Chinese with English abstract).
[17] 孟红旗, 吕家珑, 徐明岗, 蔡泽江, 王伯仁 . 有机肥的碱度及其减缓土壤酸化的机制. 植物营养与肥料学报, 2012,18:1153-1160.
Meng H Q, Lyu J L, Xu M G, Cai Z J, Wang B R . Alkalinity of organic manure and its mechanism for mitigating soil acidification. Plant Nutr Fert Sci, 2012,18:1153-1160 (in Chinese with English abstract).
[18] Goulding K W T . Soil acidification and the importance of liming agricultural soils with particular reference to the United Kingdom. Soil Use Manage, 2016,32:390-399.
doi: 10.1111/sum.12270 pmid: 27708478
[19] 鲍士旦 . 土壤农化分析. 北京: 农业出版社, 2006.
Bao S D. Soil and Agricultural Chemistry Analysis. Beijing: China Agriculture Press, 2006 (in Chinese).
[20] 曾研华, 范呈根, 吴建富, 曾勇军, 周春火, 谭雪明, 潘晓华, 石庆华 . 等养分条件下稻草还田替代双季早稻氮钾肥比例的研究. 植物营养与肥料学报, 2017,23:658-668.
Zeng Y H, Fan C G, Wu J F, Zeng Y J, Zhou C H, Tan X M, Pan X H, Shi Q H . Replacement ratio of nitrogen and potassium fertilizer by straw incorporation in early rice under the same nitrogen, phosphorus and potassium input. Plant Nutr Fert Sci, 2017,23:658-668 (in Chinese with English abstract).
[21] 孙凯, 刘振, 胡恒宇, 李耕, 刘文涛, 杨柳, 宁堂原, 王彦玲 . 有机培肥与轮耕方式对夏玉米田土壤碳氮和产量的影响. 作物学报, 2019,45:401-410.
Sun K, Liu Z, Hu H Y, Li G, Liu W T, Yang L, Ning T Y, Wang Y L . Effect of organic fertilizer and rotational tillage practices on soil carbon and nitrogen and maize yield in wheat-maize cropping system. Acta Agron Sin, 2019,45:401-410 (in Chinese with English abstract).
[22] 李昊昱, 孟兆良, 庞党伟, 陈金, 侯永坤, 崔海兴, 金敏, 王振林, 李勇 . 周年秸秆还田对农田土壤固碳及冬小麦-夏玉米产量的影响. 作物学报, 2019,45:893-903.
Li H Y, Meng Z L, Pang D W, Chen J, Hou Y K, Cui H X, Jin M, Wang Z L, Li Y . Effect of annual straw return model on soil carbon sequestration and crop yields in winter wheat-summer maize rotation farmland. Acta Agron Sin, 2019,45:893-903 (in Chinese with English abstract).
[23] 陈玉章, 柴守玺, 程宏波, 柴雨葳, 杨长刚, 谭凯敏, 常磊 . 秸秆还田结合秋覆膜对旱地冬小麦耗水特性和产量的影响. 作物学报, 2019,45:256-266.
doi: 10.3724/SP.J.1006.2019.71081
Chen Y Z, Chai S X, Cheng H B, Chai Y W, Yang C G, Tan K M, Chang L . Effects of straw-incorporation combined with autumn plastic mulching on soil water consumption characteristics and winter wheat yield in arid farming areas. Acta Agron Sin, 2019,45:256-266 (in Chinese with English abstract).
doi: 10.3724/SP.J.1006.2019.71081
[24] 曾研华, 吴建富, 潘晓华, 石庆华, 朱德峰 . 稻草原位还田对双季稻田土壤理化与生物学性状的影响. 水土保持学报, 2013,27(3):150-155.
Zeng Y H, Wu J F, Pan X H, Shi Q H, Zhu D F . Effects of rice straw incorporation on soil physical, chemical and biological properties in double cropping paddy fields. J Soil Water Conserv, 2013,27(3):150-155 (in Chinese with English abstract).
[25] Xu Y Z, Nie L X, Buresh R J, Huang J L, Cui K H, Xu B, Gong W H, Peng S B . Agronomic performance of late-season rice under different tillage, straw, and nitrogen management. Field Crops Res, 2010,115:79-84.
doi: 10.1016/j.fcr.2009.10.005
[26] Zhao Y C, Wang M Y, Hu S J, Zhang X D, Ou-Yang Z, Zhang G L, Huang B, Zhao S W, Wu J S, Xie D T, Zhu B, Yu D S, Pan X Z, Xu S X, Shi X Z . Economics- and policy-driven organic carbon input enhancement dominates soil organic carbon accumulation in Chinese croplands. Proc Natl Acad Sci USA, 2018,115:4045-4050.
doi: 10.1073/pnas.1700292114 pmid: 29666318
[27] 唐海明, 肖小平, 李超, 汤文光, 郭立君, 汪柯, 程凯凯, 潘孝晨, 孙耿 . 不同土壤耕作模式对双季水稻生理特性与产量的影响. 作物学报, 2019,45:740-754.
doi: 10.3724/SP.J.1006.2019.82030
Tang H M, Xiao X P, Li C, Tang W G, Guo L J, Wang K, Cheng K K, Pan X C, Sun G . Effects of different soil tillage systems on physiological characteristics and yield of double-cropping rice. Acta Agron Sin, 2019,45:740-754 (in Chinese with English abstract).
doi: 10.3724/SP.J.1006.2019.82030
[28] Page K L, Allen D E, Dalal R C, Slattery W . Processes and magnitude of CO2, CH4 and N2O fluxes from liming of Australian acidic soils: a review. Aust J Soil Res, 2009,47:747-762.
[29] Kumar M, Kundu D K, Ghorai A K, Mitra S, Singh S R . Carbon and nitrogen mineralization kinetics as influenced by diversified cropping systems and residue incorporation in inceptisols of eastern Indo-Gangetic Plain. Soil Tillage Res, 2018,178:108-117.
doi: 10.1016/j.still.2017.12.025
[30] 侯文峰, 李小坤, 王思潮, 汪金平, 徐祥玉, 熊又升, 丛日环 . 石灰与秸秆配施对冷浸田水稻产量与土壤特性的影响. 华中农业大学学报, 2015,34(5):58-62.
Hou W F, Li X K, Wang S C, Wang J P, Xu X Y, Xiong Y S, Cong R H . Effects of combined application of lime and straw on rice yield and soil properties in cold waterlogged paddy field. J Huazhong Agric Univ, 2015,34(5):58-62 (in Chinese with English abstract).
[31] 曾廷廷, 蔡泽江, 王小利, 梁文君, 周世伟, 徐明岗 . 酸性土壤施用石灰提高作物产量的整合分析. 中国农业科学, 2017,50:2519-2527.
doi: 10.3864/j.issn.0578-1752.2017.13.011
Zeng T T, Cai Z J, Wang X L, Liang W J, Zhou S W, Xu M G . Integrated analysis of liming for increasing crop yield in acidic soils. Sci Agric Sin, 2017,50:2519-2527 (in Chinese with English abstract).
doi: 10.3864/j.issn.0578-1752.2017.13.011
[32] Li Y, Cui S, Chang S X, Zhang Q Q . Liming effects on soil pH and crop yield depend on lime material type, application method and rate, and crop species: a global meta-analysis. J Soil Sediment, 2019,19:1393-1406.
doi: 10.1007/s11368-018-2120-2
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