Study Of Yield Potential And Yield Gap For Maize(Zea Mays L.) In Jilin Province Based On Maize Simulation Model

In this study, we used simulations with Hybrid-Maize model, field experiments and statistic survey date to assess maize yield potentials and yield gaps in three regions of Jilin province. The yield gap was quantified based on yield potential and average farmers’ yield. The distribution of yield potential, average farmers’ yield and yield gap for Jilin province were analyzed based on above date. Two years’ field experiments were conducted to explore the effects of hybrid, plant density, and planter on closing yield gap. The main results was concluded as follows:1) The yield potential for Jilin province was 14.2 t hm-2, ranged from 8.1 to 17.6 t hm-2. It was higher in central region and lower in eastern and western regions. Lacking of precipitation resulted in decreasing yield potential in western regions, so irrigation could increase yield potential by 11.5% of rainfed yield potential.2) The weight average farmers’ yield of Jilin province was 7.3 t hm-2, varied from 3.0 to 10.4 t hm-2, with farmers attained 49.8% of yield potential. The distribution of average farmers’ yield was higher in central region and lower in eastern and western regions.3) The yield gap for Jilin province was 8.0 t hm-2 with increasing yield potential of 49.8%, which was larger in eastern and western regions than that in central. The increasing yield potential(radio of yield gap and yield potential) was 49%, 57.9% and 59.8% for central, eastern and western regions, respectively.4) Grain yield was varied among hybrids. High yield hybrid could increase yield by 50% or more relative to farmers’ level of Jilin province.5) Yield of 90000 plant hm-2 plant density increased 11% relative to that of 50000 plant hm-2.6) Modern planter could increase 7.1% yield through improved seeding quality. A decrease in the plant spacing standard deviation was partly responsible(9.1 cm vs 11.4 cm).7) An integration management factors resulted in greater experimental yield compared with each factor applied individually. The grain yield of integration hybrid, plant density, and fertilizer factors increased yield by 64.9% relative to farmer’ yield and reduced yield gap to 2.86 t hm-2.