Effects of Nitrogen Forms and Water Stress on Nitrogen Uptake of Rice Plants at the Seedling Stage

doi:10.7668/hbnxb.2008.01.036

Abstract

Abstract: By using the method of nutrient solution culture and simulated water stress with PEG6000,the effects ofdifferent nitrogen forms(NO₃^--N,NH₄⁺-N and the mixture of NO₃^--N and NH₄⁺-N)and water statuses(non2water stressand water stress condition)on N uptake of rice plant at the seedling stage were studied. The results showed that:Undernon2water stress,N consumption of NO₃^--N supplied rice plant was higher than that of NH₄⁺-N supplied rice plant.Un2der water stress,supply of mixture of NO₃^--N and NH₄⁺-N significantly promoted nitrogen2use efficiencyof rice plants. Water stress had no significant effect on nitrogen2use efficiency of NH₄⁺-N supplied rice plant,but signifi2cantly reduced in NO₃^--N supplied rice plant. Under non2water stress or water stress,the nitrogen2use efficiency ofNO₃^--N supplied rice plant was the lowest among the three nitrogen forms treatments.

Key words: Rice, Nitrogen form, Water stress, Nitrogen use efficiency

CLC Number:

S143.1

CHEN Xiao-yuan, GAO Zhi-hong, LI Yu-hua. Effects of Nitrogen Forms and Water Stress on Nitrogen Uptake of Rice Plants at the Seedling Stage[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2008, 23(1): 163-167. doi: 10.7668/hbnxb.2008.01.036.

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