লোহার সালফেটকে কাঁকড়যুক্ত জমিতে সফলভাবে দেওয়া সম্ভব নয় ৷
But making a 3 percent solution of sulphate and ferrous sulphate with more powerful iron element , on spraying twice on the leaves , the yield increased to 3750 kilograms per hector meaning an increase of 1500 percent happened .