https://www.researchprojecttopics.com/2018/06/30/comparative-effectiveness-organic-manure-n-p-k-fertilizer-soil-properties-shoot-dry-matter-yield-cassava-manihot-esculenta/
Comparative Effectiveness Of Organic Manure And N.P.K Fertilizer On Soil Properties And Shoot Dry Matter Yield Of Cassava (Manihot Esculenta)