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由玉米叶片养分标准值明显看出，在黑土中高产田上氮素是产量的主要限制因素，在中低和中高产田上提高土壤供钾能力，补允钾肥可以使产量提高。植株组成成份处于ＤＲＩＳ围内园为养分相对平衡，处于外国外为显著地不平衡。养分指数可以把ＤＲＩＳ标准值和ＤＲＩＳ图养分丰缺的定性指标转为定量，把限制产量的营养元素通过数量列出次序。田间试验结果与Ｎ、Ｐ、Ｋ指数相吻合。
It is obvious from the standard value of maize leaf nutrient that nitrogen is the main limiting factor of yield in high yielding field in black soil. It can increase soil potassium supply in middle and low and middle and high yielding fields and supplement potassium fertilizer to increase yield. Plant components in DRIS Wai Wai for the relative balance of nutrients, in a significant foreign imbalance. The Nutrient Index converts the quantitative indicators of nutrient abundance in both the DRIS standard and the DRIS diagram to quantification and lists the nutrient-limiting production quantities by quantity. Field test results and N, P, K index coincide.