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Acta Agron Sin ›› 2018, Vol. 44 ›› Issue (01): 115-125.doi: 10.3724/SP.J.1006.2018.00115

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

Effects of Conventional Urea Combined with Slow-release Urea Application on Phosphorus Uptake, Translocation and Distribution in Mechanically Transplanted Rice with Different Plant Spacings

WANG Hai-Yue,JIANG Ming-Jin,SUN Yong-Jian*,GUO Chang-Chun,YIN Yao-Zhu,HE Yan,YAN Tian-Rong,YANG Zhi-Yuan,XU Hui,MA Jun*   

  1. Rice Research Institute of Sichuan Agricultural University / Key Laboratory of Crop Physiology, Ecology, and Cultivation in Southwest, Ministry of Agriculture, Wenjiang 611130, Sichuan, China
  • Received:2017-04-15 Revised:2017-09-10 Online:2018-01-12 Published:2017-09-28
  • Contact: Sun Yongjian, E-mail: yongjians1980@163.com; Ma Jun, E-mail: majunp2002@163.com E-mail:hywang2015zh@163.com
  • Supported by:

    This study was supported by the National Key Research and Development Program of China (2016YFD0300506), the National Science and Technology Project of Food Production of China (2013BAD07B13), Scientific Research Fund of Sichuan Provincial Education Department (16ZA0044), and the Funding of Academic and Technical Leaders Cultivation of Sichuan Province.

Abstract:

Spilt-plot design with plant spacing (16, 18, and 20 cm with 30 cm-row spacing, respectively) as main plot and slow-release urea application rate (36, 66, 96, and 126 kg ha–1) combined with 54 kg ha–1 of conventional urea as subplot was arranged. In the present study P accumulated amount of rice plant at the main growth stages, P absorption and P uptake rate during various growth stages, P translocation amount of stem-sheath, and the P translocation rate and P conversion rate of leaf at the grain-filling stage were significantly affected by the slow-release urea application rate. Ninety-six kg ha–1 of slow-release urea combined with 54 kg ha–1 of conventional urea significantly improved P uptake, translocation and redistribution under the plant spacing of 18 cm, which is a best cultural practices for mechanically transplanted rice with the highest yield of 11 463.8 kg ha–1 in Southwest. A relatively high plant density (208.4 thousand plants per hectare) was established when the plant spacing was 16 cm. In addition, a higher total P accumulation amount of plant was achieved under 126 kg ha–1 of slow-release urea, resulting in improved P redistribution and high grain yield. The relatively lower plant density (166.7 thousand plants per hectare) was due to the larger plant spacing under the conditions of 20 cm-plant spacing and 126 kg ha–1 of slow-release urea. Although P accumulated amount decreased, P translocation from stem-sheath and leaf to panicle increased, resulting in increased P accumulation in panicle and grain yield. Furthermore, a relatively high correlation between P translocation amount (especially the P translocation amount of stem-sheath from heading stage to maturity stage) and grain yield (r = 0.72**) under a certain plant spacing combined with the slow-release urea, could be beneficial to improving grain yield.

Key words: mechanically transplanted rice, plant spacing, slow-release urea, P uptake, translocation and distribution

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