Mathematical models of high-yield cultivation for Puna chicory.

The mathematical models of high-yield cultivation for fresh glass of Puna chicory were established by analyzing correlations between fresh yield and planting density,nitrogen,phosphorus,potassium application amount.The results showed that the cultivation measures for the fresh yield over 13500.00kg/hm2 were 186120～194040 plants/hm2,31.68～34.96 kg/hm2 of pure N,112.05～127.95 kg/hm2 of P2O5 and 85.61～96.19 kg/hm2of K2O,and the cultivation measures for the fresh yield over 142500.00 kg/hm2 were 191500～201180 plants/hm2,33.68～37.89kg/hm2 of pure N,110.55～129.45kg/hm2 of P2O5 and 78.41～93.75kg/hm2of K2O.The degree of affecting the fresh yield was planting densitypotassium application amounthitrogen application amountphosphorus application amount and the interaction between different factors was planting density and nitrogenplanting density and phosphorusnitrogen and phorsphorusnitrogen and potassiumplanting density and potassium phosphorus and potassium.