Soil Building Effect of Planting Forage Legumes in Young Orchard in Hilly Red Soil Regions,South Hunan,China
Objective]The objective of this study is to obtain fertilizing effects of interplanting forage legumes and corresponding handling modes,which would be lay a basis for fertilizing measures of young orchard in hilly red soil region of south Hunan,China.[Method]In order to explore effects of interplanting forage legumes and corresponding handling modes on soil fertility in young citrus orchards, a field experiment was carried out interplanting six species of forage legumes,includingTrrifoliumrepens, Chamaecradtanictitans,Chamaecristarotundifolia,ChamaecristarotundifoliaCPI 86134, Macroptiliumlathyroides,andLotononisbainesiiwere,separately and designed to have the crops, harvested,laid over or plowed down,in a young citrus plantation in a hilly red soil region of South Hunan. Soil physicochemical properties of all the plots were measured after the experiment for analysis of the effects.[Result]Compared with CK(no crop interplanted),all the plots,on the whole,increased in contents of organic matter,total nitrogen,alkali-hydrolyzable nitrogen,and available phosphorus, and the increasing effects were the highest in the plots with the crops plowed down or incorporated,but decreased in content of readily available potassium and pH,and the decreasing trends were the lowest in the plots with the crops plowed down. Among all the plots,the plot withChamaecradtanictitansplowed down raised the contents of organic matter,total nitrogen,alkali-hydrolyzable nitrogen,and available phosphorus contents the highest in margin and lowered the content of readily available potassium the least, and the plot withChamaecristarotundifoliaincorporated came the next in the effects. Besides,the plot with Chamaecradtanictitansincorporated lowered soil pH the least. Compared with CK,all the plots increased fruit yield,single fruit weight,and tree height,canopy diameter,and number and length of spring/autumn branches of the orange trees. The effect of the plot withChamaecradtanictitansincorporated was the most significant and the plot withChamaecristarotundifoliaincorporated came the next. Besides,the plot with Chamaecradtanictitansincorporated was the highest in biomass of the forage legume yielded,and in amount of nitrogen and phosphorus returned into the soil,and in soil microbial biomass carbon,soil microbial biomass nitrogen,and urease activity,too.[Conclusion]Therefore,it can be concluded that the practice of interplantingChamaecradtanictitansand then incorporating the crop is the most suitable soil building mode for young citrus orchards,but it needs supplementation of some potassium and phosphorus fertilizers. Besides,it is also necessary to apply some alkaline material,like lime,to offset the effect of interplanting forage legumes lowering soil pH.
Hilly red soil region in South HunanYoung orchardForage LegumeSoil chemical properties
国家科技期刊平台
NSTL
万方数据
维普
