Title: Influence of Water-saving Irrigation and Nitrogenous Fertilizer Application on Assessment of the Rice Quality
Abstract: In order to analyze the response relationship between water-saving irrigation, nitrogenous fertilizer application with rice quality a rice field experiment was carried out.Six nitrogenous fertilizer levels (0, 60, 85, 110, 135 and 160 kg/hm 2 ) were applied to find its influence on the rice quality under the black soil water-saving irrigation conditions in the northeast cold regions.The TOPSIS (technique for order preference by similarity to ideal solution) model improved on the basis of game theory to comprehensively assess the rice quality was also applied.The results showed that the low and high fertility are bad for the rice quality formation under the water-saving irrigation conditions specifically, the three quality indicators, which are processed by WS110 are higher than other processing products, except for chalkiness degree, followed by WS135, WS160, WS85, WS60 and WS0.According to the variability and spatial distribution, it is indicated that the field data acquisition processed by WS110 is better than others with small distribution and dispersion degree.Meanwhile, it can also reflect the better uniformity of three quality indicators of rice than others.Comparing with the traditional TOPSIS model, the improved TOPSIS model can lead to the desired assessment results.Considering that the curve fitting degree is relatively high with the fitting coefficient R 2 of 0.88 and the assessment results can conform to the reality.Thus, it is feasible to apply improved TOPSIS model on the basis of game theory to assess the rice quality, as a result, we can provide the relatively reliable scientific basis for the field changing scheme and offer a kind of new thought to the assessment method.