Journal of Stress Physiology & Biochemistry, Vol. 9 No. 2 2013, pp. 97-107 ISSN 1997-0838
Original Text Copyright (cc) 2013 by   Jahan, Bin Nordin, Bin Che Lah and Khanif

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QueryDate : 2016-12-24
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Effects of Water Stress on Rice Production: Bioavailability of Potassium in Soil 

Md Sarwar Jahan1,*, Mohd Nozulaidi Bin Nordin1, Mond Khairi Bin Che Lah1, Yusop Mohd Khanif2

1 Department of Agricultural Sciences, Faculty of Agriculture and Biotechnology, University Sultan Zainal Abidin, 20400 Kuala Terengganu, Malaysia
2 Department of Land Management, Faculty of Agriculture, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

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Received November 26, 2012

Water demand in agriculture, municipal, and industrial purposes is increasing rapidly which will pressure on future demand in agriculture. To justify less water use in rice production, we produced rice under different water levels (DWLs) and justified potassium bioavailability. There were five DWLs were employed in this experiment. Besides measuring yield and yield parameters, relative water content (WRC) and chlorophyll content in leaves, soil pH and bioavailability of potassium (K) in soil solution were measured. Yield and yield parameters showed insignificant difference under DWLs. Different water levels did not affect weekly data of chlorophyll content and RWC in leaves. But chlorophyll content and RWC in leaves were significantly higher in week 6 or 9 than week 3. Different water levels did not affect soil pH. Our results suggested that rice can be produced under low water input without affecting yield and yield parameters and K bioavailability in soil.

Key words:  bioavailability of potassium, chlorophyll content, low water irrigation, relative water content, rice

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