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Acta Agron Sin ›› 2015, Vol. 41 ›› Issue (01): 80-88.doi: 10.3724/SP.J.1006.2015.00080


Effect of Nitrogen Application Amounts on Uptake and Utilization of Potassium in Cotton Grown in Improved Coastal Saline Land Regions

ZOU Fang-Gang1,2,ZHANG Guo-Wei1,WANG You-Hua1,ZHAO Wen-Qing1,ZHOU Zhi-Guo1,*   

  1. 1 Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture / Nanjing Agricultural University, Nanjing 210095, China; 2 Seeds Management Station of Jiangsu Province, Nanjing 210036, China
  • Received:2014-06-04 Revised:2014-09-30 Online:2015-01-12 Published:2014-11-11
  • Contact: 周治国, E-mail: giscott@njau.edu.cn


A field experiment using transgenic cotton cultivar Xiangzamian 8 with different nitrogen application amounts(0, 150, 300, 375, 450, and 600 kg N ha1)was carried out in the coastal improved saline land region of Dafeng city in 2010 and 2012. Results showed that the nitrogen application increased potassium uptake of cotton at different growth stages, with the highest increment at the peak flowering-boll opening stage, and the percentages of potassium uptake decreased from seedling to peak flowering stages, but increased from peak flowering to boll maturing stages. In addition, nitrogen application lowered the decreasing speed of potassium concentration in middle and upper fruiting branches at later growth stages, but had less influence on lower fruiting branches. The marginal effect of potassium uptake (promoted amount of potassium uptake due to 1 kg increase of N application) showed an upward-downward trend with the increase of nitrogen application rate. The higher the position of fruiting branches grown, the more the nitrogen amount demanded to meet the highest marginal effect of potassium uptake. Under the nitrogen application of 300–375 kg ha–1, the economic coefficient of biomass and potassium was relatively high, eigenvalues of dynamic model of potassium content and potassium accumulation were relatively coordinate, and the marginal effect of potassium uptake and lint production efficiency of potassium were relatively high in middle and upper fruiting branches. Excessively high nitrogen application resulted in a relatively narrow rise of yield, and the marginal effect of potassium uptake and lint production efficiency of potassium were relatively low; excessively low nitrogen application, however, also resulted in a lower yield, as economic coefficient of biomass and potassium was relatively low.

Key words: Cotton, Improved saline land, Nitrogen amounts, Potassium uptake and utilization

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