Soil Carbon, Nitrogen and Phosphorus Dynamics as Affected by Solarization Alone or Combined with Organic Amendment

摘要: Soil solarization, alone or combined with organic amendment, is an increasingly attractive approach for managing soil-borne plant pathogens in agricultural soils. Even though it consists a relatively mild heating treatment, the increased soil temperature may strongly affect microbial processes and nutrients dynamics. This study aimed to investigate impact of either without addition farmyard manure, dynamics various C, N P pools. Changes total contents some functionally-related labile pools (soil biomass C N, K2SO4-extractable basal respiration, KCl-exchangeable ammonium nitrate, water-soluble P) were followed across 72-day field solarization experiment carried out during summer period on clay loam Southern Italy. physico-chemical properties (temperature, moisture content pH) also monitored. The average at 8-cm depth solarized soils approached 55 °C as compared 35 found nonsolarized soil. Two-way ANOVA (solarization×organic amendment) showed that both factors significantly affected most above variables, being highest influence exerted by amendment. With no manure addition, did not Whereas pH, and, greater extent, greatly affected. An release was Yet, altered quality soluble residues released lowered C-to-N ratio substrates. Additionally, metabolic quotient (qCO2) while C-to-total (microbial quotient) decreased over whole time course. We argued promoted mineralization readily decomposable native matter (e.g. biomass) thus rendering larger, least short-term, available fraction mineral nutrients, namely forms. However, longer prospective lead over-exploitation resources Manure levels Thus, amendments could represent important strategy protect lands from excessive exploitation maintain fertility enhancing pest control.