multiple crop index中文什么意思

例句与用法

1. 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
   小麦-玉米套种两作产量皆高是以周期短、复种指数高、肥力耗竭强为特征，土壤肥力没有时间得以复原。
2. The results indicate that ( 1 ) land production is on the basic development level , the restrictive factors of land production are the ratio of land production , product of crop , the area of medium and low production , multiple crop index
   研究结果表明：土地生产力处于基本可持续发展阶段。土地生产率、公顷粮食产量、中低产田的面积、复种指数等对土地生产力的持续发展起限制作用；资源环境保护从初步可持续发展到基本可持续阶段。
3. 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
   然后，根据理论预期以及单因素分析结果，我们建立了土壤肥力变化的社会经济及政策影响因素模型，分别采取差分和固定效应两种具体模型形式，对各种可能的社会经济及政策因素对土壤肥力变化影响的方向和程度做了定量估计。
4. Based on the cultivated land fertility , according to grain yield , the planting coverage , the ratio of the grain crops to industrial crops and multiple crop index , the cultivated land population carrying capacity in 2010 and 2030 at the different population increasing modes were attained by predicting and analysing the food produce and the cultivated land carrying capacity
   摘要以耕地地力为基础，根据粮食单产、种植面积、粮经比和复种指数对河南省粮食产量和耕地资源承载力进行了预测和分析，得出不同人口增长模式下的河南省2010年和2030年耕地资源人口承载力。