multiple cropping index 中文意思是什麼
multiple cropping index
解釋
復作指數-
Wheat - maize interplanting of both crops ' high yield features shorter cycling period, higher multiple cropping index, stronger fertility exhaustion and no time for soil fertility to recover
小麥-玉米套種兩作產量皆高是以周期短、復種指數高、肥力耗竭強為特徵，土壤肥力沒有時間得以復原。 -
Other factors that were found to have positive effects on soil nutrients include the multiple cropping index and the practice of plowing stalks back into the land. these findings lead to several policy recommendations. first, it shows that economic variables are very important in determining changes in soil fertility, and therefore the theory and method of economics should be taken seriously by soil scientists
然後，根據理論預期以及單因素分析結果，我們建立了土壤肥力變化的社會經濟及政策影響因素模型，分別採取差分和固定效應兩種具體模型形式，對各種可能的社會經濟及政策因素對土壤肥力變化影響的方向和程度做了定量估計。
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