... content ,slow release fertilizers,traditional soil amentments and a new approach using bio-feeds.The ... the organic fertilizer .The contents of N P K and trace -elements.(B ,Cu,Zn,Mn,Mg ... ,Si ,etc.)can be customized according to requirements N=nitrogen,P ... =phosphorus ,K=potassium products:1.pure organic fertilzer .organic nutrients>30% .organic and inorganic ...