High Yield Rice Cultivation Supporting The Role Of Technology And Evaluation

This paper is an attempt to analyze the five factors related to rice cultivation and to evaluate the contribution to high-yielding by the AHP (analytic hierarchy process) Method. These factors mainly include selection of rice varieties, raising seedlings, transplantation, fertilizer application, and control of pests and diseases. Through using information in recent years from the experiments of super-high-yielding cultivation in different ecological regions at different altitudes such as Guiyang, Zunyi, Qiandongnan and Qianxinan of Guizhou, China, the most important factor that influences the yield can be pointed out at the different levels.The results were as follows. (1) Fertilizer application was the first constraint that limit rice yield increase, but varieties, basic-seedling determination and control of pests and disease was the second, third and fourth respectively, and raising rice seedlings was the last. (2) Cultivation techniques at different yield levels were different. For example, varieties became the major factor that limited yield in low-yield field. In Guizhou, selecting new varieties, especially in hybrids could significantly promote the yield from lower to middle level. Basic-seedling determination and fertilizer application were the most important constraints in the middle-yielding field. In these fields the majority were short of number of effective panicles resulted from lack of basic-seedling. Therefore, improving transplanting seedlings, increasing basic-seedlings and applying appropriate fertilizer could sharply increase rice output. Applying fertilizer was the most significant constraint that limited yield from high to super-high-yielding level. Because traditional techniques of applying fertilizer resulted in supply of insufficient nutrient particularly at the later stage of rice development, improving ratio of nitrogenous, phosphate and potash fertilizers, applying fertilizer for panicles would promote rice development at later stage to increase yield.According to the above, we suggested that selecting suitable varieties, raising...