Here is a study comparing different methods of fertilizer application and its impact. The study was conducted for 3 seasons starting from Kharif,2007 in the field of Sri. Sankaraiha, V of Konidedu village of Kurnool dt, who has volunteered to change his style of farming. He is well in non-chemical way of production system since, 2006 after being immersed fully in chemicals for the past 10 years.
Here is the table showing details of study :Click here