Emphasis on resource conservation and their efficient utilization, availability of high yielding crop varieties of varying duration and growth rhythms, integrated approach for plant protection measures, availability and use of fertilizer nutrients, non availability of additional urea for agriculture, decline in input use efficiency over the years and decrease in per capita land holding, has changed the concepts of intercropping. Dec 2006

As energy demand increase and fossil fuels reserves are limited, research is increasingly directed towards alternative renewable fuels that are environmentally benign. Among the different possible resources, biodiesel derived from different vegetable oils and animal fats has become more attractive recently because of its environmental benefits and the fact that is made from renewable resources. Dec 2006