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keyword: Soil fertility – 19 free books.
These books are not included in Project Gutenberg.
Research on Soil Management and Conservation
Luis Eduardo Akiyoshi Sanches Suzuki (editor)
Fertilizer use optimization in sub-Saharan Africa
Charles S. Wortmann and Keith Sones
Smart Fertilizers and Innovative Organic Amendments for Sustainable Agricultural Systems
Maria de la Luz Mora et al. (editors)
Sustainable Agriculture and Soil Conservation
Concetta Eliana Gattullo et al. (editors)
Donald S. Ross et al. (editors)
Sustainable Production in Food and Agriculture Engineering
Jolanta B. Krolczyk et al. (editors)
Fertilizer use optimization in sub-Saharan Africa
Charles S. Wortmann and Keith Sones