不同密度及氮、磷、钾肥用量对普那菊苣鲜草产量的影响

Quadratic rotational regression combination design with four factors and five levels was used to study the relation- ship between Puna chicory fresh yield and planting density (x1), the fertilizer dosage of N(x2), P(x3), K(x4). The regression equation between chicory fresh yield and factors was put forward. Under the experimental condition, max yield was≥135 000.00 kg/hm^2, the corresponding planting density, pure N, P2O5, K2O was 161850~174000 stem/hm^2, 28.48~31.77 kg/hm^2, 113.93~126.08 kg/hm^2 and 78.60~91.54kg/hm^2; when yield was≥142 500.00 kg/hm^2, the corresponding planting density, pure N, P2O5, K2O was 160590~173940 stem/hm^2, 28.26~32.40 kg/hm^2, 111.08~128.93 kg/hm^2 and 82.09~97.46 kg/hm^2. The effect of each factor on Puna chicory fresh yield was planting density＞K fertilizer＞N fertilizer＞P fertilizer. The interaction analysis of model indicated that Puna chicory could reach high yield when reasonable planting density integrates with right dosage of K.