以自交系Ｍｏ１７与杂交种丹玉１３为材料，通过对群体全生育期植株干物质与氮、磷、钾积累的较系统分析，建立了群体干物质与氮、磷、钾积累的数学模式，揭示了自交系与杂交种的差异；Ｍｏ１７全生育期干物质积累量为丹玉１３的６０％，氮、磷、钾吸收量为丹玉１３的５３％、５９％和６７％，生产单位子粒Ｍｏ１７较丹玉１３所需氮少１０５％、需钾多１３％。 The inbred line Mo17 and hybrid Dan Yu 13 were used as materials to establish the mathematical model of dry matter accumulation and nitrogen, phosphorus and potassium accumulation in the population through the systematic analysis of plant dry matter and nitrogen, phosphorus and potassium accumulation during the whole growth period , Revealing the differences in inbred lines and hybrids; dry matter accumulation during Mo17 whole growth period was 60% of Dan Yu 13, nitrogen, phosphorus and potassium uptake of Dan Yu 13 53%, 59% and 67%, production Unit grain Mo17 than Dan 13 required nitrogen less 10  5%, 13% more potassium.