Effects of biochar amendment and nitrogen fertilization on soil microbial biomass pools in an Alfisol under rain-fed rice cultivation

作     者：Segun Oladele Adebayo Adeyemo Ajoke Adegaiye Moses Awodun 

作者机构：Department of AgronomyAdekunle Ajasin University Akungba AkokoOndo StateNigeria Department of CropSoil and Pest ManagementFederal University of Technology AkureOndo StateNigeria 

出 版 物：《Biochar》 (生物炭（英文）)

年 卷 期：2019年第1卷第2期

页      面：163-176页

核心收录：

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：Biochar Nitrogen fertilizer Microbial biomass Metabolic quotient Fungal/bacteria ratio 

摘      要：Field studies were conducted over 2 years to determine the response of soil microbial biomass pool to biochar and N fertilizer combinations in a rain-fed rice cropping *** was applied at four doses:0 t ha^(−1),3 t ha^(−1),6 t ha^(−1) and 12 t ha^(−1) in combination with N fertilizer at four rates:0 kg ha^(−1),30 kg ha^(−1),60 kg ha^(−1) and 90 kg ha^(−1) to a Typic Paleustalf *** samples from two depths(0-10 and 10-20 cm)were collected to determine microbial biomass C(MBC),N(MBN),P(MBP),MBC/N ratio,MBC/P ratio,soil CO_(2) flux,microbial qCO_(2),cultivable bacterial and fungal *** and N fertilizer combination effects on MBC,MBN and MBP pools were dependent on biochar doses,N fertilizer rates and soil ***/N and MBC/P ratios were decreased after 2 *** CO_(2) flux was maximum at post-seeding stage of rice plant,while decreasing trends occurred at active tillering and harvest *** doses of biochar irrespective of its combination with N fertilizer rates decreased CO_(2) flux and microbial qCO_(2).Combinations of biochar and N fertilizer increased fungal/bacterial ratio and induced a shift to a more fungal-dominated population after 2 *** results sug-gest that combination of biochar doses(3-12 t ha^(−1))with N fertilizer rates had stimulatory effects on microbial biomass pools and activity with positive implications for organic carbon accumulation,nitrogen(N)and phosphorus(P)retention in tropical soils.