长期以来,在农业科研工作中,人们习惯于单因子的研究分析方法,即将其他各种因子固定,单独变动一个因子来考察该因子对农牧产品的产量,质量等方面的影响。这种研究方法的优点是因子的作用明确,试验技术比较简单,便于分析比较,“一次变动一个因素,全面进行记录”至今仍是一种经典的研究方法。但是自然界的因素是多种多样的,各因素之间存在着各种正或反的相互作用,单因子试验往往不能反映出事物发展的真实面貌。在化肥研究中,氮磷钾三种养分因素对农作物产量各有不同的效应,而它们之间,既有着相互促进又有着相互抑制的关系。在研究中将磷钾肥用量固定而只变动氮肥一个因素,来观察它对作物 For a long time, in agricultural research work, people are accustomed to the single-factor research and analysis method. That is, the other various factors are fixed and individually changed to examine the impact of the factor on the output and quality of agricultural and animal husbandry products. The advantage of this research method is the clear function of the factor, the relatively simple test technique, and the convenience of analysis and comparison. “One change at a time and comprehensive recording” is still a classic research method. But there are many kinds of factors in nature. There are various kinds of positive or negative interactions among the factors. One-factor tests often can not reflect the true appearance of things. In the study of chemical fertilizers, the three nutrient factors of NPK have different effects on the yield of crops, and there is a mutual promotion and mutual inhibition between them. In the study will be a fixed amount of phosphorus and potassium fertilizer only a factor in nitrogen, to observe it on the crop