Co-Authors:
Wohlfarth, G.W., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Schroeder, G.L., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Abstract:
Our previous conclusions, that manures may be ineffective in raising aquaculture yields above levels attained by daily N and P fertilization, is limited to conditions of soil and water naturally rich in nutrient minerals and carbonates. Manures may be valuable inputs when soil and water are poor in essential nutrients, or of a low pH. Situations exist in which manures are the cheapest source of N and P minerals. © 1991.