Forage potential production simulation model and its application

YANG Xiu-mei;ZHANG Wei-xin;GAO Liang-zhi;YANG Chun-hua;ZHANG Ying-jun;Hannaway B. David;ZHANG Xin-quan;College of Animal Science and Technology,Sichuan Agricultural University;Department of Agricultural Economy and Information,Jiangsu Academy of Agricultural Sciences;Institude of Grassland Sciences,China Agricultural University;Department of Crop & Soil Science,Oregon State University;

forage potential production adaptation simulation model(For-PASM);;forage production simulation;;cool-season forage;;warm-season forage;;Lolium multiflorum Lam;;Hemarthria compressa

Forage potential production adaptation simulation model( For-PASM) simulates forage growth and production of cool- and warm-season species. This model has a normal simulation system and a parameter regulation system.Each of them has several modules,including development stage and date,dynamic changes of leaf area index,harvest date and times,photosynthesis,and daily and total annual biomass accumulation. Plant development is driven by temperature,with duration of growth stages dependent on accumulated heat units( AHU). Harvest date is calculated by AHU required for heading stage development for grasses and the budding stage for legumes. Annual ryegrass( Lolium multiflorum Lam)and whipgrass( Hemarthria compressa) yield data were used to validate the model in Yaan,Sichuan province. The result showed that the model could be used to predict the growing progress and seasonal and annual yield.