Initial Litter Chemical Indices as Selection Criteria of Organic Nutrient Resources for Enhancement of Soil Fertility for Smallholder Farmers in Southern Ethiopia

作     者：Abebe Abay Dhyan Singh Wassie Haile 

作者机构：National Soil Testing Centre P.O. Box 31037 Addis Ababa Ethiopia College of Agriculture Hawassa University P.O. Box 5 Hawassa Ethiopia 

出 版 物：《Journal of Agricultural Science and Technology(B)》 (农业科学与技术（B）)

年 卷 期：2015年第5卷第2期

页      面：101-108页

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

主　　题：Lignin polyphenolics TN total organic carbon (TOC). 

摘      要：Nutrient release from applied organic nutrient source （ONS） depends on temperature, soil moisture, soil properties, their chemical composition and microbial activity. In order to apply ONS to fulfill the nutrient requirements of plants, knowledge of quality and quantity of chemical constituents of the ONS has paramount importance. Erythrina abyssinica （EA）, Erythrina brucei （EB） and Ensete ventricosum （EV）, the first two being nitrogen-fixing indigenous multipurpose agroforestry trees in Ethiopia, were randomly collected from Southern Ethiopia. The average total nitrogen （TN） contents of EA, EB and EV were 4.05%, 3.35% and 2.56%, respectively. Similarly, the mean total soluble polyphenolics contents were 0.052%, 0.023% and 0.19%, and the mean lignin contents were 9.7%, 12.6% and 6.5%, respectively. In general, these ONS had medium to high TN content. Thus, the ONS can be selected based on their quality, quantity and ratio of their chemical constituents as alternative or supportive organic sources. A ＂decision tree＂ is best fitted for selection of these ONS.