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采用3因素混合正交设计在宁夏盐池干旱区进行人工草地建植试验,连续2年对6个牧草品种的株高、密度及产量进行研究。结果表明:3因素中品种对株高和密度的影响较大,有机肥和氮磷钾对同一品种牧草株高及密度的影响较小。鲜草产量各因素的影响程度大小为:品种>氮磷钾>有机肥,这3个因素对产量影响极显著(P<0.01),有机肥与氮磷钾的交互作用影响显著(P<0.05)。豆科品种的鲜草产量均大于禾本科,以草木樨产量最高,作为草田轮作牧草较好,其次是紫花苜蓿,可作为长期利用的优良牧草。正交设计得到鲜草产量的最优组合为草木樨+有机肥(36 t·hm-2)+氮磷钾中肥配比(N165 kg·hm-2、P135 kg·hm-2和K135 kg·hm-2),与产量最高的处理15各因素水平完全一致,证实了正交设计结果的可靠性。
A 3-factor mixed orthogonal design was used to construct artificial grassland in Yanchi arid area of Ningxia. The plant height, density and yield of 6 pasture varieties were studied for two consecutive years. The results showed that among the three factors, the effects of different cultivars on plant height and density were greater. The effects of organic manure and NPK on the plant height and density of the same species were insignificant. The influences of various factors on the yield of fresh grass were: variety> NPK> organic fertilizer, the three factors had significant effects on the yield (P <0.01), and the interaction between organic manure and NPK significantly (P <0.05 ). Leguminous varieties of fresh grass yield were greater than Poaceae, to the highest yield of licorice, as grass rotation better forage grass, followed by alfalfa, can be used as good long-term pasture. The optimum combination of orthogonal design was the ratio of N, P and K fertilizer (N165 kg · hm-2, P135 kg · hm-2 and K135 kg · hm-2) · Hm-2), which is exactly the same as that of the highest yield of treatment 15, confirming the reliability of the orthogonal design results.