Comparison of Soil Physicochemical Properties of 6 Forage Species in Nanxiong Red Soil of Guangdong Province
In order to assess the tolerance of forage in the red soil of Nanxiong,northern Guangdong,the experiment used six forage:They are Tephrosia candida,Cajanus cajan,Pennisetum purpureum,Cichorium intybus,Melinis minutiflora and Pennisetum alopecuroides which were experimented and planted in the red soil of Nanxiong,Guangdong.By observing the growth of these forage plants in red soil and measuring soil proper-ties such as bulk density,porosity,pH,organic matter and conductivity one year later,an analysis of variance was conducted to compare the differential effects of different forages on soil quality.The results show that(1)after planting the forage,the pH value of the soil was improved to varying degrees.Notably,C.intybus in-creased the soil pH value by 0.54,resulting in an increase in conductivity by 30.1 μs/cm compared to the con-trol group;(2)the maximum reduction in soil bulk density was achieved by C.cajan,with a decrease of 16.3％,while T.candida and P.purpureum were more conducive to the enrichment of soil organic matter;(3)T.candida,C.cajan,C.intybus and P.alopecuroides all effectively enhanced the total soil porosity and the proportion of non-capillary porosity in total porosity from 25.96％to 30.17％-43.39％;(4)forage varieties showed a significant positive correlation with bulk density and a highly significant negative correlation with total porosity,indicating that soil structure changes have an impact on forage and different forages have differential effects on soil structure.
万方数据
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