A simple soil layer system which is composed of a finer soil (sand) layer underlain by a coarser soil (gravel) layer pro......

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Owing to overcoming the characteristics that there are many economic and technical indexes which are fuzzy and incompati......

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干旱缺水是制约我国农业经济和农村社会持续、快速，健康发展的关键生态因子，因此，必须走节水而优质、高产、高效的现代农业产业路子。......