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The effects of the use of organic solid wastes on the growth of citrus trees

机译：使用有机固体废物对柑橘树生长的影响

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Two types of organic solid wastes were selected to be applied in a citrus orchard: the sewage sludge (the most common on the settlements) and the manure (the most common on the agricultural fields). The sewage sludge is a residue originated from the wastewater treatment - the solid phase. Its application as an organic fertilizer may represent an alternative to the pollution effects in nature. In an orchard of orange-trees {Citrus sinensis [L.] Osbeck), the application of sludge was compared with the application of manure and with the control in order to observe the growth response of the trees. Biometric methods where used - number of leaves per tree, diameter of the trunk, leaf area, specific leaf areas and leaf chlorophyll content. In general, the citrus plants response to the application of sewage sludge and manure was positive for the plant growth, compared to the control. The application of the manure, and especially the sewage sludge (once this fertilizer / soil amendment is available in larger amounts) may be a profitable alternative application to the use of mineral fertilizers and to other soil amendments. Moreover, as the possible destinations of sewage sludge (sea, deposition in land fields, incineration) provoke environmental problems, its agricultural reuse is essential to avoid those problems, when correctly applied in relation to trace elements and to pathogenic parameters. The reuse of this solid waste may be a clean and a safe technique to preserve the environment contamination.
机译：选择了两种类型的有机固体废物用于柑桔园：污水污泥（在定居点上最常见）和肥料（在农田上最常见）。污水污泥是源自废水处理的残留物-固相。它作为有机肥料的应用可能代表了自然界污染的替代方法。在橘树果园（Citrus sinensis [L.] Osbeck）中，将污泥的施用量与粪肥的施用量以及对照的施用量进行比较，以观察树木的生长响应。使用的生物识别方法-每棵树的叶子数量，树干直径，叶面积，特定叶面积和叶绿素含量。一般而言，与对照相比，柑桔类植物对污水污泥和粪肥施用的反应对植物的生长呈阳性。施用肥料，尤其是污水污泥（一旦可以大量使用这种肥料/土壤改良剂），可能是替代矿物肥料和其他土壤改良剂的有益替代应用。此外，由于污水污泥的可能目的地（海洋，陆地上的沉积物，焚化）引发了环境问题，因此，如果正确地将其与微量元素和病原学参数结合使用，则其农业再利用对于避免这些问题至关重要。重新使用这种固体废物可能是一种清洁安全的技术，可以保护环境。

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