Synergistic effect of organic and inorganic fertilization on the soil inoculum density of the soilborne pathogens Verticillium dahliae and Phytophthora spp. under open-field conditions

Abstract Background The increasing demand of food causes an excessive exploitation agricultural lands, often inducing phenomena soil sickness accompanied by the development soilborne diseases. use residual biomasses together with inorganic fertilizers can be considered a good practice for controlling inoculum density phytopathogens since conditioners release nitrogen, polyphenols and fatty acids that, especially in vitro, have demonstrated various degree suppressiveness against such pathogens. Further, organic amendments also modify population culturable bacteria fungi turn, affect diseases several ways. With this study, authors aim to evaluate impact synergistic application different on Verticillium dahliae Phytophthora spp . during two potato cycles under open-field conditions. used fertilization crop were olive pomace residues (OPR), composts from municipal solid wastes (CMW), spent mushroom compost (SMC), livestock manure-based (BRX). Results appeared inhibited BRX due its low C/N ratio that caused quicker nitrogen respect others conditioners. In contrast, OPR was conducive aforementioned pathogen biomass characterized very high percentage unsaturated rather, stimulate V. Finally, did not influence same because they apparently turned into no toxic compounds quickly. reduced equally all combination fertilizers, regardless their composition quantity, mainly general microbial suppression. Therefore, chemical characteristics spp. Conclusions results work underline behavioral diversity pathogens towards means adopted. are sensitive any kind combined while should using quantity acids.