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Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (06): 1035-1043.doi: 10.3724/SP.J.1006.2014.01035

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

Potassium Accumulation, Distribution, and Utilization in Wheat with Yield Potential of 9000 kg ha−1 in Rice-Wheat Rotation System

DING Jin-Feng,ZI Yan,YANG Jia-Feng,PAN Ting,FENG Chao-Nian,ZHU Xin-Kai,LI Chun-Yan,PENG Yong-Xin,GUO Wen-Shan*   

  1. College of Agriculture, Yangzhou University / Key Laboratory of Crop Genetics and Physiology of Jiangsu Province / Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Lower Reaches of Yangtze River of Ministry of Agriculture / Wheat Research Institute, Yangzhou University, Yangzhou 225009, China
  • Received:2013-07-25 Revised:2014-03-04 Online:2014-06-12 Published:2014-04-09
  • Contact: 郭文善, E-mail: wheat@yzu.edu.cn

Abstract:

Different wheat populations of Yangmai 20 were established in the rice-wheat rotation system by managing plant density and nitrogen application amount, timing and splitting ratio in 2010–2011 and 2011–2012 growing seasons. These populations were divided into high yield (HY, <9000 kg ha-1) and super high yield (SHY, ≥9000 kg ha-1) groups. Characteristics of potassium (K) uptake and utilization in both population groups were compared to guide high-yield wheat production in the rice-wheat rotation system. In SHY population, K absorption from elongation to anthesis was greater than that of other growing periods, which accounted for 52–68% of the total K uptake. The K accumulation amounts at anthesis and maturity were significantly higher in SHY population than in HY population. At maturity, K accumulation amount in leaf, stem, rachis + hull, and grain was positively correlated with grain yield. After anthesis, K translocation amount from stem to grain was positively correlated with grain yield, whereas K translocation amount from rachis + hull to grain was negatively correlated with grain yield. In SHY population, K accumulation amount was 430–450 kg ha-1 at anthesis and 366–408 kg ha-1 at maturity; K accumulation amounts at maturity were 46–49 kg ha-1 in leaf, 244–269 kg ha-1 in stem, 40–46 kg ha-1 in rachis + hull, and 35–46 kg ha-1 in grain; K translocation amount at anthesis from stem to grain was 46–52 kg ha-1; and K accumulation amount in rachis + hull from anthesis to maturity was 9–17 kg ha-1. For yielding grain higher than 9000 kg ha-1, winter wheat in the rice-wheat rotation system required 4.57–4.87 kg K nutrient to produce 100 kg grain. Meanwhile, the K use efficiency and K harvest index were 20.56–22.02 kg kg-1 and 0.095–0.112, respectively.

Key words: Wheat in wheat-rice rotation system, High-yield production, Accumulation, distribution and utilization of potassium

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