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Effects of fertilization on cotton growth and nitrogen use efficiency under salinity stress.

DAI Jian-long1,2, LU He-quan1, LI Zhen-huai1, DUAN Liu-sheng2, DONG He-zhong1   

  1. (1Cotton Research Center, Shandong Academy of Agricultural Sciences/Key Laboratory of Cotton Breeding and Cultivation in HuangHuaiHai Plain, Ji’nan 250100, China; 2Crop Research Center for Chemical Regulation, China Agricultural University, Beijing 100091, China)
  • Online:2013-12-18 Published:2013-12-18

Abstract: Cotton (Gossypium hirsutum) was raised at different salinity levels (0, 0.15% and 0.30%) by irrigating with fresh or seawater. The effects of fertilization (N, NK, NP and NPK) on plant growth, nitrogen (N) uptake and N use efficiency were studied. The results showed that salinity and fertilization both affected the biomass, agronomic N use efficiency, N bioavailability and nitrogen accumulation of plants, and significant interaction was observed between the two factors. Fertilization could improve  N use efficiency and nitrogen accumulation of plants under salinity stress, and significantly promoted the cotton yield. Among the fertilization treatments, N combined with P and K had the best effect. The benefit of fertilization was better under low salinity (0.15%) than under moderate salinity (0.3%).