不同密度及氮、磷、钾肥用量对普那菊苣鲜草产量的影响

Effects of Different Planting Densities and Dosages of N,P,K on Fresh Yield of Puna Chicory

运用四因素五水平二次回归正交旋转组合设计方法,对普那菊苣鲜草产量与种植密度(x1)、氮肥施用量(x2)、磷肥施用量(x3)、钾肥施用量(x4)间的关系进行了研究,建立了普那菊苣鲜草产量与各因子间的回归方程。通过模拟研究,结果表明,在试验条件下,普那菊苣鲜草产量≥135000.00kg/hm2的农艺措施为种植密度161850～174000株/hm2,纯N28.48～31.77kg/hm2,P2O5113.93～126.08kg/hm2,K2O78.60～91.54kg/hm2;鲜草产量≥142500.00kg/hm2的农艺措施为种植密度160590～173940株/hm2,纯N28.26～32.40kg/hm2,P2O5111.08～128.93kg/hm2,K2O82.09～97.46kg/hm2。各因子对普那菊苣鲜草产量的影响程度依次为种植密度>钾肥施用量>氮肥施用量>磷肥施用量;模型的交互效应分析表明,只有合理密植结合钾肥的适量施用,种植普那菊苣才能获得高产。

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 / hm2,the corresponding planting density, pure N, P2O5, K2O was 161 850～174 000 stem/hm2, 28.48～31.77 kg / hm2, 113.93～126.08 kg / hm2 and 78.60～91.54kg / hm2;when yield was≥142 500.00 kg / hm2,the corresponding planting density, pure N,P2O5,K2O was 160 590～173 940 stem / hm2, 28.26～32.40 kg / hm2, 111.08～128.93 kg / hm2 and 82.09～97.46 kg / hm2. The effect of each factor on Puna chicory fresh yield was planting densityK fertilizerN fertilizerP fertilizer.The interaction analysis of model indicated that Puna chicory could reach high yield when reasonable planting density integrates with right dosage of K.