Zedan, Ghassan Jayid, Omar Nazhan Ali, and Ziyad Khalaf Salih. 2010. “EFFECT OF ORGANIC FERTLIZER AND INTERCROPPING FOR COWPEA (Vigna Sinensis) AND SWEET CORN(Zea Mays Var. Regosa ) IN GROWTH , YIELD AND LAND EQUIVALENT RATIO ( LER )”. Diyala Agricultural Sciences Journal 2 (1):138-51. https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/3144.