Effect of phosphorous fertilization and plant spacing on yield and some of its components of two types of sun flower

ABSTRACT

An experiment was caried out at agricultural research station/university of Basrah during season of 1996/1997 to study the effects of four levels of phosphorous fertilization [0, 80, 160 and 240 kgp2o5/ha] and three plant spacing [35x70,25x70 and 15x70cm] on some yield components of two Sunflower varieties. [Peredovick and Akmar]. Results shown hat head diameter, plant yield, number of seeds/head and weight of a thousand achene increased with increasing phosphorous fertilization levels up to 160 kgp2o5/ha, while head diameter and plant yield decreased at narrow spacing. The effect of interaction was significant on head diameter and plant yield. Variety Periodic gave higher yield then Akmar whereas, there was no significant differences between them in harvest index and 1000 achene weight