Effects of Nitrogen Forms and Water Stress on Growth and Nitrogen Accumulation and Distribution of Rice Plants

doi:10.7668/hbnxb.2009.06.023

Abstract

Abstract: By using the method of nutrient solution culture and simulatedwater stresswith PEG6000,the effectsof dif ferent nitrogen forms(NO_3--N,NH₄⁺-N and the mixture of NO₃_--N and NH₄⁺-N) and water statuses(nonwater stress and water stress condition) on growth and N accumulation and distribution of rice plant were studied.The results obtained were as follows: The plant height and leaf area of treatment 25/ 75(NH₄⁺/NO₃_-)was the maximal among treatments,which was 1.5 and 1.3 times of treatment 100/ 0 respectively,under water stress condition.Root lengh of treatment 25/ 75was all the maximal among treatments under either non-water stress or water stress condition,which was 6.8 times of treatment 100/ 0 under nonwater stress,and 3.3 times under water stress.N accumulation in different part of plant under nonwater stress were all higher than that under water stress.Under two water condition,N accumulation in root of treatment 0/ 100 were all the maximal,and treatment 100/ 0had the maximal N accumulation in stem,the lowest was treatment 0/ 100.Under nonwa ter stress,leaf N accumulation of treatment 100/ 0was the maximal,under water stress,leaf N accumulation of treatment 75/ 25was the maximal.Under water stress,supply of single NO₃_--N might increase N accumulation in root,supply of mixture of NO₃_--N and NH₄⁺-N could promote N accumulation and distribution in stem and leaf of rice plant.

Key words: Rice, Ammonium, Nitrate, Water stress, Nitrogen accumulation

CLC Number:

S143.1

CHEN Xiao-yuan, GAO Zhi-hong, LIU Zhen-hua. Effects of Nitrogen Forms and Water Stress on Growth and Nitrogen Accumulation and Distribution of Rice Plants[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(6): 116-122. doi: 10.7668/hbnxb.2009.06.023.

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