Effects of Rape Straw Retention and Water and Nitrogen Management on Population Quality and Yield of Hybrid Rice Under Rice-rape Rotation

Yaozhu YIN, Changchun GUO, Yongjian SUN, Yunxia WU, Huaqing YU, Zhibai SUN, Qiao ZHANG, Haiyue WANG, Zhiyuan YANG, Jun MA

doi:10.16819/j.1001-7216.2019.8102

2019 , Vol. 33 >Issue 3: 257 - 268

DOI: https://doi.org/10.16819/j.1001-7216.2019.8102

Research Papers

Effects of Rape Straw Retention and Water and Nitrogen Management on Population Quality and Yield of Hybrid Rice Under Rice-rape Rotation

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Rice Research Institute of Sichuan Agricultural University/Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Wenjiang 611130, China;

^*Corresponding author, E-mail: yongjians1980@163.com

Received date: 2018-09-13

Revised date: 2019-02-26

Online published: 2019-05-10

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Abstract

【Objective】It has great significance to investigate the interaction mode between straw returning and water-nitrogen (N) management on rice population quality and yield.【Method】Hybrid rice (Yixiangyou 2115) was used as experimental materials with two straw retention ways as main plot (crop straw composting and direct straw returning) and conventional irrigation and alternate irrigation as split plot and four N rates as split-split plot. The relationship between population quality and yield of hybrid rice were also analyzed.【Results】Straw returning and water-nitrogen (N) management exert significant or extremely significant effects on biomass accumulation of hybrid rice, LAI and grain yield. Correlation analysis indicated that there existed significantly or highly significantly positive correlations between population quality index and yield. The straw composting had a highly significant effect on population growth rate and grain yield compared with direct straw returning, the high valid leaf area index at the full heading stage increased by 4.71%-6.50%, Dry matter weight of population during maturity increased by 9.22%-13.30%, and the effective panicle number increased by 5.9%-9.8%, the spikelet number by 1.5%-5.2%, the yield by 9.5%-13.4%. Compared with conventional irrigation, controlled alternative irrigation could ensure sufficient panicle number, increase dry matter accumulation, slow down leaf area attenuation rate from jointing stage to full heading stage, accelerate population growth rate at seed-setting stage, and increase grain number per panicle and yield significantly. With the increase of nitrogen rate, the number of tillers, dry matter accumulation, effective leaf area ratio and effective leaf area rate all increased at first and then decreased. 【Conclusion】 From the perspective of the effect of the three factors, straw composting, alternative irrigation, 150 kg/hm² nitrogen level were the optimum treatment of water saving and N reduction in this experiment. It can significantly improve efficient LAI of full heading (4.80-5.32), enhance the high dry matter accumulation rate during filling stage (6.94-7.36 t/hm²), notely increase effective panicle number (181.6×10⁴-220.9×10⁴/hm²) and grain number per panicle(180-200), achieving grain yield of hybrid rice of 10328.1-12464.1 kg/hm².

Key words： hybrid rice; straw returning; irrigation regimes; N rate; population quality; yield

Cite this article

Yaozhu YIN, Changchun GUO, Yongjian SUN, Yunxia WU, Huaqing YU, Zhibai SUN, Qiao ZHANG, Haiyue WANG, Zhiyuan YANG, Jun MA . Effects of Rape Straw Retention and Water and Nitrogen Management on Population Quality and Yield of Hybrid Rice Under Rice-rape Rotation[J]. Chinese Journal OF Rice Science, 2019 , 33(3) : 257 -268 . DOI: 10.16819/j.1001-7216.2019.8102

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