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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (08): 1201-1214.doi: 10.3724/SP.J.1006.2016.01201

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

Effects of Potassium Fertilizer Rate on Biomass accumulation and Grain Yield of Yongyou Japonica/indica Hybrids Series

WEI Huan-He1,MENG Tian-Yao1,LI Chao1,SHI Tian-Yu1,MA Rong-Rong2,WANG Xiao-Yan3, YANG Jun-Wen4, ZHANG Hong-Cheng1,*,DAI Qi-Gen1,*,HUO Zhong-Yang1,XU Ke1,WEI Hai-Yan1,GUO Bao-Wei1   

  1. 1 Innovation Center of Rice Cultivation Technology in Yangtze River Valley, Ministry of Agriculture /Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/ Co-innovation Center of Modern Production Technology for Grain Crops, Yangzhou University, Yangzhou 225009, China; 2 Crop Research Institute, Ningbo Academy of Agricultural Sciences of Zhejiang Province, Ningbo 315101, China; 3 Ningbo Seed Company of Zhejiang Province, Ningbo 315101, China; 4 Agricultural Technology Extension and Service, Yinzhou District, Ningbo City, Zhejiang Province, Ningbo 315100, China
  • Received:2015-10-29 Revised:2016-04-26 Online:2016-08-12 Published:2016-05-23
  • Contact: 戴其根,E-mail: qgdai@yzu.edu.cn; 张洪程,E-mail: hczhang@yzu.edu.cn E-mail:920964110@qq.com
  • Supported by:

    This study was supported by the China Special Fund for Agro-scientific Research in the Public Interest (201303102),Special Program of Super Rice of the Ministry of Agricultural (02318802013231),the Great Technology Project of Ningbo City (2013C11001), the Key Projects of Jiangsu Province (BE2015340), Innovative Training Program of Yangzhou University (KYLX15_1371), Science and Technology Innovation Fund of Yangzhou University (2015CXJ042), and Precise Diagnosis and Management of Conteol Technology Based On Modeling and GIS of Gaoyou City (SXGC[2013]248).

Abstract:

In order to investigate proper potassium application rate and its effects on growth and grain yield for Yongyou japonica/indica hybrids series, a field experiment was conducted using Yongyou 12 and Yongyou 538 with five treatments of 0, 75,150,225, and 300 kg ha-1potassium application. Results indicated that compared with check treatment (0 kg ha-1), potassium application increased yield by 9.2−14.0% for Yongyou 12, and 9.8−15.0% for Yongyou 538. In both years, the highest yield of Yongyou 12 and Yongyou 538 was both achieved at potassium application rate of 225 kg ha-1. Potassium application significantly increased number of panicles and spikelets per panicle. With the increase of potassium application rate, leaf area index and plant dry matter weight at jointing, heading, and maturity stages, as well as leaf area duration and dry matter accumulation from jointing to heading, and leaf area duration from heading to maturity were increased synchronously. Dry matter accumulation of plant from heading to maturity increased firstly and decreased then with the increase of potassium application rate, and the highest dry matter accumulation was achieved at potassium application rate of 225 kg ha-1. Compared with check treatment (0 kg ha-1), potassium application increased SPAD value, photosynthetic rate, and root blending rate from heading to maturity. Compared with check treatment (0 kg ha-1), potassium application increased significantly nitrogen and potassium absorption at jointing, heading, and maturity stage. Nitrogen and potassium accumulation from heading to maturity was increased firstly and decreased then with the increase of potassium application rate, and the highest nitrogen and potassium accumulation was achieved at potassium application rate of 225 kg ha-1. K partial productivity, internal nutrient efficiency in K, and K agronomy efficiency all decreased with the increase of potassium application rate.

Key words: Potassium fertilizer, Super rice of Yongyou japonica/indica hybrids series, Grain yield

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