Influence of water regime on growth, yield, and nitrogen uptake of rice

Sahrawat, K L (1981) Influence of water regime on growth, yield, and nitrogen uptake of rice. Communications in Soil Science and Plant Analysis, 12 (9). pp. 919-932. ISSN 0010-3624

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Greenhouse and field experiments were conducted to study the effects of water regime on growth of rice. The greenhouse experiment investigated the effects of two water regimes‐continuous flooding and flooding with soil drying between crops for 2 to 3 weeks on the growth of rice during six cropping (for six week each) on seven soils varying widely in total N contents (0.07 to 0.35%). The results averaged for the 7 soils indicated that the drymatter production or N uptake of rice was not affected by the water regimes during the six croppings. The field experiment conducted during the dry season for two consecutive years (1976 and 1977) on a near neutral clay soil studied the effects of three water regimes (continuous flooding alternate flooding and soil drying every 2 weeks, and continuous flooding with 2 weeks mid season soil drying after 6 weeks of transplanting) and three levels of fertilizer N (0, 100 and 200 kg N/ha as urea) on grain yield and N uptake of rice. The results confirmed the absence of any significant reduction in grain yield or N uptake as a result of any of the soil drying treatments during the growing season on the unfertilized plots carrying a rice crop. On the plots fertilized with 100 or 200 kg N/na, alternate flooding and drying resulted in a significant depression in both grain yield and N uptake. Soil analysis supported heavy losses of N in the fertilized plots that underwent alternate flooding and soil drying apparently by nitrification and denitrification reactions. The results of this study suggest that alternate flooding and drying of soils in the presence of established rice plants itiay not cause a significant loss of nitrogen in unfertilized plots although in plots fertilized with high rates of N the losses may be large as indicated by the performance of rice crop.

Item Type: Article
Uncontrolled Keywords: Continuous flooding, alternate flooding and soil drying, mid‐season soil drying, N uptake of grain, flood fallow, unfertilized soils
Subjects: Others > Soil Science
Others > Fertilizer Applications
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 22 Nov 2011 09:32
Last Modified: 09 Dec 2011 06:07
Official URL:
Funders: International Rice Research Institute
Acknowledgement: This study was carried out under a post doctoral research I am thankful fellowship at the International Rice Research Instit1.lte. to Dr. F. N . Ponnamperu ma, Principal Soil Chemist for his valuable suggestions during the study and preparation of the manuscript.
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