the effect of economical and manure eiements on the mentha piperita growth and function.to study the effect of economical and manure elements on the mentha piperita growth and function experimentally compeletly accidentaly performed with four amount of manure and 3 levels of iron little nutritious and zinc by 3 replication the replications involved the manure in 4 levels (0, 15, 25, 35) tonne...