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Analysis of influencing factors on grain crop yield in Qiqihar city, Heilongjiang Province

In this paper, both qualitative and quantitative methods are adopted to study the factors affecting the grain crop yield in Qiqihar in depth. From the macroscopic aspect, this paper studies the influence of natural factor, planting structure and policy factor on grain crop yield by qualitative method, and the influence degree of each factor is analyzed; on the other hand, the paper selects six factors including the sown area, the yield per unit area, the fertilizer consumption, the total power of agricultural machinery, rural labor force and rural electricity consumption, and 21 years are divided into three periods in order to find the key factors that affect the grain crop yield using quantitative analysis method by grey relational analysis based on the data of Qiqihar city from 1994 to 2014. Combined with the characteristics of Qiqihar city, suggestions are proposed according to the key factors to increase the grain crop yield steadily and promote agricultural modernization based on sustainable development.