Abstract:
The potential effects of varieties,fertilizers andenvironmental componentas and their combination on rice yieldhave been studied The energy balance,the balance of soil nutri-ents and organic matter, the economic benefits and productivitymdex of ultra-high yielding rice have also been analysed The re-sults suggested that improvement of soil water condition and thecombination of varieties fertilizers and environmental componentsas a package is a technical direection for achiving rice ultra-highyield and for increasing its economic and ecological benefits.