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首页> 外文期刊>Regional Environmental Change >Management of sludge from fish ponds at the edge of the Itaparica Reservoir (Brazil): an alternative to improve agricultural production
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Management of sludge from fish ponds at the edge of the Itaparica Reservoir (Brazil): an alternative to improve agricultural production

机译：管理伊塔帕里卡水库（巴西）边缘鱼塘的污泥：改善农业生产的替代方法

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摘要

Sludge generated in intensively managed tilapia fingerling breeding ponds near the Itaparica Dam in the semi-arid Brazilian northeastern region was tested as a soil conditioner to produce lettuce in an effort to mitigate the present environmental impact of the deposition of this sludge, thereby giving it a productive destiny. A greenhouse experiment was performed by mixing the sludge with a Haplic Planosol topsoil, a characteristic soil of the region, so that the sludge corresponded to 0, 25, 50, 75, and 100% of the mixture (substrate). The experiment was set up as a randomized block design with five blocks, each with three pots (5-kg substrate per pot) of the five sludge proportion treatments. One lettuce plant was transplanted into each pot, maintained under greenhouse conditions, and harvested 35 days after transplanting. Sludge, soil, and the substrates were evaluated for nutrient concentration and physical characteristics. Green and dry weights, stem diameter, and nitrogen, phosphorus, and potassium concentrations in the aboveground parts of the lettuce plants were determined. Sludge incorporation into the substrate improved its chemical and physical characteristics. The lettuce plants grew best in the substrate with 75% sludge, increasing its biomass production by 50% and more than doubling its nitrogen uptake.
机译：在半干旱的巴西东北部地区Itaparica大坝附近的集约化管理的罗非鱼鱼种繁殖池中产生的污泥已作为土壤改良剂进行了测试，以生产莴苣，以减轻这种污泥沉积对环境的当前影响，从而使其成为生产命运。通过将污泥与Haplic Planosol表土（该地区的特有土壤）混合来进行温室实验，以使污泥对应于混合物（基质）的0％，25％，50％，75％和100％。实验设置为随机区组设计，分为五个区，每个区中有五个污泥比例处理中的三个盆（每个盆有5千克底物）。将一种生菜植物移植到每个盆中，保持在温室条件下，并在移植后35天收获。评估污泥，土壤和基质的养分浓度和物理特性。测定了莴苣植物地上部分的干重，茎干直径以及氮，磷和钾的浓度。污泥掺入底物中改善了其化学和物理特性。莴苣植物在基质中生长最好，污泥为75％，其生物量产量增加了50％，氮吸收量增加了一倍以上。

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