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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (01): 174-180.doi: 10.3724/SP.J.1006.2012.00174

• RESEARCH NOTES • Previous Articles     Next Articles

Characteristics and Correlation Analysis of N and P Uptake and Utilization of Early Maturing Late Japonica under Different N Fertilizer Levels

YANG Xiong,MA Qun,ZHANG Hong-Cheng*,WEI Hai-Yan,LI Guo-Ye,LI Min,DAI Qi-Gen,HUO Zhong-Yang, XU Ke, ZHANG Qin, GUO Bao-Wei,GE Meng-Jie   

  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province / Innovation Center of Rice Cultivation Technology in Yangtze Rive Valley, Ministry of Agriculture, Yangzhou University, Yangzhou 225009, China?
  • Received:2011-04-21 Revised:2011-07-25 Online:2012-01-12 Published:2011-11-07
  • Contact: 张洪程, E-mail: hczhang@yzu.edu.cn, Tel: 0514-87979220

Abstract: A field experiment was carried out with 50 early-maturing late japonica rice varieties adopted in the region of Yangtze River under seven nitrogen application levels (0, 150.0, 187.5, 225.0, 262.5, 300.0, and 337.5 kg ha-1) to investigate N and P accumulation, N and P uptake rate, N and P use efficiency and correlations between them. The main results were as follows. (1) In the range of 0–337.5 kg ha-1, N concentration and accumulation amount were significantly increased with the increase of N fertilizer under three growth stages. P concentration and accumulation amount were significantly improved with the increase of N fertilizer at elongation and heading of rice, but P accumulation was significantly deceased at maturing when N fertilizer was too high. (2) N and P uptake rates were significantly increased with the increase of N fertilizer during sowing to elongation. During elongation to heading, N and P uptake rates were increased at first and then decreased with the increase of N fertilizer. There were no regular patterns of N and P uptake rate under different N fertilizer levels, and the maximum of N and P uptake rate was at 225.0 kg ha-1 N fertilizer during heading to maturing of rice. (3) N and P use efficiencies of grain yield production (NUEg and PUEg) were significantly decreased with the increase of N fertilizer (except PUEg at 0 kg ha-1). There was a parabola regular pattern of N and P harvest index in the range of 0–337.5 kg ha-1 N fertilizer, and the maximum was at 262.5 kg ha-1 N fertilizer. (4)The relationship of nitrogen and phosphorus uptake and utilization was significantly synergic during the rice growth stage. Rice yield was significantly correlated with N/P accumulation and N/P uptake rate before heading. Increasing N fertilizer may help to increase nitrogen and phosphorus uptake and utilization. But it may not increase or even decrease when N fertilizer is too high.

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