不同配比蚯蚓粪复合肥对桉树生长及土壤性质的影响

Effect of worm-cast compound based fertilizer on soil properties and Eucalyptus growth

【目的】探讨不同配比蚯蚓粪复合肥对桉树树体营养及生长状况的影响,为提高广西桉树林地土壤肥力提供参考依据。【方法】采用单因素随机区组试验,设4个基肥处理:对照CK(纯复合肥)、处理A(75%复合肥+25%蚯蚓粪)、处理B(50%复合肥+50%蚯蚓粪)和处理C(25%复合肥+75%蚯蚓粪)。调查统计桉树生长状况并测定分析土壤性状变化。【结果】与对照处理相比,处理A、B和C桉树叶片中大量元素分别增加166%、166%和156%;树高分别增加125%、125%和127%,地(胸)径分别增加125%、120%和133%,以处理C的促生作用最显著。同时各处理均可促进桉树树体对土壤中有机质和营养元素的吸收,减缓土壤pH下降。【结论】添加25%～75%蚯蚓粪复合基肥可增加树高和加粗地(胸)径,促进树体对土壤中有机质和营养元素的吸收,减缓土壤中pH、有机质和营养元素下降程度。采用75%蚯蚓粪+25%复合肥配比作基肥效果最佳。

[Objective]The present experiment was conducted to study the effect of worm-cast compound based fertilizers on nutrition and growth of Eucalyptus to increase the soil fertility and sustaining growth of Eucalyptus plantations in Guangxi.[Method]A single factor randomized block experiment was conducted to survey and analyze the growth status of Eucalyptus and the changes in soil properties.Four treatments,viz.,control（100% compound fertilizer）,treatment A（75% compound fertilizer ＋25% wormcast fertilizer）,treatment B（50% compound fertilizer ＋50% wormcast fertilizer） and treatment C（25% compound fertilizer ＋ 75% wormcast fertilizer） were used in the current experiment.[Result]Over the control,macronutrient content in leaves of Eucalyptus were found to be increased in trees treated with A,B and C treatments by 166,166 and 156%,over control,respectively.The tree height and diameter was found to be increased by 125,125 and 127%,and 125,120 and 133%,respectively.Compared to the control,treatment C promoted the best growth of Eucalyptus.Meanwhile,all treatments enhanced the intake of organic matter and nutrient,and alleviated the declining soil pH.[Conclusion]Adding 25-75% worm-cast compound base fertilizer can significantly promote the growth of Eucalyptus,improve the nutrient distribution in Eucalyptus,increase tree height and diameter,facilitate the absorption of organic matter and nutrient in soil,and alleviate the decrease in soil pH.Therefore,75% worm-cast base fertilizer shall be applied to reduce the amount of compound fertilizer in Eucalyptus plantations.