Impacts of Organic and Non-organic Paddy Farming Practices on Surface Water Quality in Selected Areas

Proceedings of International Forestry and Environment Symposium Pub Date : 2024-02-15 DOI:10.31357/fesympo.v27.7183

Fernando N.D.S.M., Godakumbura P.I., Prashantha M.A.B., Cooray A.T.

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Abstract

Paddy (Oryza sativa L.) cultivation plays major role in Sri Lanka. Mainly Organic and Non-organic paddy farming methods are conducted. Organic paddy farming method only used organic fertilizers and non-organic paddy farming method used chemical fertilizers which are Urea, Triple Super Phosphates. Therefore, farming practices can be affected to the surface water quality creating various health hazards. The study was conducted from November 2021 to February 2022 (Maha season) to assess the impact of organic and non-organic paddy farming practices on surface water quality in Wallewala, Homagama, and Kottawa paddy agricultural lands by analyzing pH, EC, TDS, DO, BOD, COD, total hardness, nitrate, nitrite, phosphate, sulfate, chloride, potassium, zinc, and chromium. Wallewala is newly created environment sensitive agricultural land in less human influence. Both organic and non-organic paddy lands are in that area. Kottawa paddy lands are cultivated only chemical fertilizers and the Homagama paddy lands are cultivated by organic fertilizers. Randomly, six and nine surface water samples were collected from paddy irrigated systems in Wallewala area represent to organic and non-organic paddy lands respectively. Randomly, five and six surface water samples were collected from paddy irrigated systems in Homagama Organic, and Kottawa non-organic paddy lands respectively. The water from both paddy systems, min pH (5.25±0.04), max EC (315±1.00 μScm-1 ), min DO (6.13±0.06 mgL-1), max BOD5 (2.82±0.06 mgL-1), max sulfate (205.76 ppm), max chloride (45.91 ppm), max K (5.63 ppm), and max Zn (0.12 ppm) were found, while the study revealed that all the water quality parameters were not exceeded the reported ambient water quality standards for inland waters in Sri Lanka for irrigation purposes. Further EC, TDS, COD, total hardness, sulfates, chloride, potassium, and zinc were greater in non-organic paddy lands in both Wallewala and Kottawa areas. According to the obtained data, there was no water pollution from the paddy cultivation in respective areas. But these results indicate that water quality parameters vary with the utilized fertilizers. Keywords: Paddy cultivation, Water quality, Organic paddy farming, Non-organic

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有机和非有机水稻耕作法对部分地区地表水质量的影响

水稻（Oryza sativa L.）种植在斯里兰卡发挥着重要作用。斯里兰卡主要采用有机和非有机水稻种植方法。有机水稻耕作法只使用有机肥料，而非有机水稻耕作法则使用尿素、三过磷酸钙等化肥。因此，耕作方法会影响地表水水质，造成各种健康危害。研究于 2021 年 11 月至 2022 年 2 月（马哈季节）进行，通过分析 pH 值、EC 值、TDS、DO、BOD、COD、总硬度、硝酸盐、亚硝酸盐、磷酸盐、硫酸盐、氯化物、钾、锌和铬，评估有机和非有机水稻耕作方法对 Wallewala、Homagama 和 Kottawa 水稻农田地表水质的影响。瓦勒瓦拉是一片新开辟的环境敏感农田，受人类影响较小。该地区既有有机水稻田，也有非有机水稻田。Kottawa 水田只使用化肥，而 Homagama 水田则使用有机肥。在瓦勒瓦拉地区的水稻灌溉系统中随机采集了 6 份和 9 份地表水样本，分别代表有机和非有机水稻田。在霍马加马有机水稻田和科塔瓦非有机水稻田的水稻灌溉系统中，分别随机采集了 5 份和 6 份地表水样本。两个水稻系统的水，最小 pH 值（5.25±0.04），最大 EC 值（315±1.00 μScm-1），最小溶解氧（6.13±0.06 mgL-1），最大 BOD5（2.82±0.06 mgL-1），最大硫酸盐（205.76 ppm），最大氯化物（45.91 ppm），最大钾（5.研究显示，所有水质参数均未超过斯里兰卡内陆水域用于灌溉的环境水质标准。此外，在瓦勒瓦拉和科塔瓦地区的非有机稻田中，导电率、总淀粉含量、化学需氧量、总硬度、硫酸盐、氯化物、钾和锌的含量都较高。根据获得的数据，这些地区的水稻种植没有造成水污染。但这些结果表明，水质参数随肥料的使用而变化。关键词水稻种植水质有机水稻种植非有机水稻种植

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Proceedings of International Forestry and Environment Symposium

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