Yawalkar K.S. <br/><br/>
Manures and fertilisers 

 - 11th 
 -  Agro-horticultural publishing house, Nagapur  2011 
<br/><br/><label>ISBN: </label>978-81-7910-348-7 
<br/><br/><label>Dewey Class. No.: </label>631.81YAW