A methodology for on-farm cropping systems research /  
H.G. Zandstra, et`al. 
 - Manila, Philippines :   International Rice Research Institute,  1981. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cropping systems -- Asia--Cropping systems -- Asia
<br/><br/><label>LC Class. No.: </label>S602.5.A87  / MET 1981