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Application of Land Equivalent Ratio (LER) on Sequential Cropping

Liu Yuhua Zhang Lifeng (College of Agronomy, Hebei Agricultural University, Baoding 071001)  
Land equivalent ratio (LER) is an important concept in farming system. So far, it was used in inter cropping and there were different opinions in different references. This paper, on the basis of analysing of LER, reveals it's essence, proposes it's definition and formula. The theoretical sense are discussed in this paper.
【CateGory Index】: S344.3,
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