Distribution of Exchangeable Zinc in Lowland Rice Cultivated Soils in Sri Lanka as Affected by the Differences in Climate, Soil, and Water Availability
C. Chandrasekara, M. Ariyarathne, U. Rathnayake, D. Sirisena, M. Nijamudeen, H. Kadupitiya, R. Chandrajith, L. Suriyagoda
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Abstract
Zinc (Zn) is an essential micronutrient required for the growth and development of rice plants. Even though rice is widely cultivated, and its grains are used as the staple food in Sri Lanka, the exchangeable Zn concentration in rice cultivated soils is not known. Therefore, this study was conducted to determine the distribution of exchangeable Zn concentration and examine the interactive effects of agro-climatic zones (ACZ), soil orders and water sources on determining the concentration of exchangeable Zn in lowland paddy fields in Sri Lanka. A total of 7.309 soil samples were collected from six ACZ, six soil orders, and three water sources used for rice cultivation using stratified random sampling approach. Exchangeable Zn concentration was determined using inductively coupled plasma mass spectrophotometry (ICP-MS) after extracting in 0.01 M CaCl2 solution. Concentration of exchangeable Zn was in the range of 0.03–11.247 µg kg−1 with mean value of 438.2 µg kg−1. The highest concentration was recorded in the Wet zone (p < 0.05). Concentration of exchangeable Zn in Histosols was higher than that in Alfisols, Inceptisols, and Vertisols (p < 0.05). In addition, rainfed paddy fields retained the highest Zn than the paddy fields receiving supplementary irrigation water (p < 0.05). Concentration of exchangeable Zn was negatively correlated with soil pH. Therefore, implementation of soil Zn improvement strategies considering the heterogeneity of exchangeable soil Zn among ACZ, soil orders and water sources are needed.
期刊介绍：
Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences.
Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.
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