Variability of pH and EC of Selected Rice Cultivated Soils of Sri Lanka

K. H. B. H. Delgoda, S. Sugathas, N. A. S. A. Neththasinghe, E. D. C. T. Chandrasekara, D. M. S. B. Dissanayaka, M. Ariyarathne, B. Marambe, D. N. Sirisena, U. Rathnayake, H. K. Kadupitiya, L. D. B. Suriyagoda
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Abstract

Soil pH and electrical conductivity (EC) are two major chemical properties affecting nutrient availability and rice grain yield. Therefore, this study was conducted to investigate the variation of pH and EC in the topsoil layer (0-15 cm) of rice fields as affected by major water source used for rice cultivation, rice-based cropping system adopted and rice growing soil orders in different agro-climatic zones (ACZs) in Sri Lanka. A total of 998 soil samples were collected from lowland rice fields. Both pH and EC were measured in 1:5 soil: water extracts. The pH of soil samples was in the range of 3.0-7.7 with a mean value of 5.0. Moreover, 75% of the soil samples had pH values below the optimum range for rice cultivation (5.5-7.0). Values of pH observed in Dry Zone soils were higher (5.2) than those in Wet Zone (4.4). Soil EC values ranged between 1.0 - 3,100 μScm−1 with a mean value of 148.5 μScm−1. Soil EC was similar among climatic zones (P>0.05). Upcountry Intermediate zone recorded the highest soil EC than that in other ACZs (P<0.05). Moreover, 73%, 22%, 3%, 2% and 0.1% of soil samples recorded EC values in the ranges of less than 150 (non-saline), 150-400 (slightly saline), 400-800 (moderately saline), 800-2000 (highly saline) and more than 2000 (very highly saline) μScm−1, respectively. Considering micro (e.g. paddy track) and macro (e.g. ACZ) scale spatial heterogeneity in soil pH and EC, appropriate site-specific strategies need to be adopted to improve soil pH and EC to suit sustainable rice crop production.
斯里兰卡水稻栽培土壤pH和EC的变异
土壤pH和电导率是影响养分有效性和水稻产量的两个主要化学性质。因此,本研究旨在探讨斯里兰卡不同农业气气带(acz)水稻种植主要水源、稻作制度和水稻种植土壤顺序对稻田表层(0-15 cm) pH和EC的影响。共收集了998份低地稻田土壤样品。pH和EC均在1:5土:水萃取液中测定。土壤样品pH值在3.0 ~ 7.7之间,平均值为5.0。此外,75%的土壤样品的pH值低于水稻种植的最佳范围(5.5-7.0)。干旱区土壤pH值(5.2)高于湿区土壤pH值(4.4)。土壤EC值在1.0 ~ 3100 μScm−1之间,平均值为148.5 μScm−1。不同气候带土壤EC相似(P>0.05)。中央区土壤EC最高(p < 0.05)。此外,73%、22%、3%、2%和0.1%的土壤样品的EC值分别在小于150 μScm−1(无盐)、150-400 μScm−1(微盐)、400-800 μScm−1(中盐)、800-2000 μScm−1(高盐)和大于2000 μScm−1(极高盐)之间。考虑到土壤pH和EC在微观(如稻田)和宏观(如ACZ)尺度上的空间异质性,需要采取适当的因地制宜的策略来改善土壤pH和EC,以适应水稻作物的可持续生产。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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