EFFECT OF HUMIC ACID AND IRON CHELATE IN THE GROWTH AND YIELD OF SUNFLOWER Helianthus annuus L.*

Abstract

Afield experiment was carried out during the spring season of 2015 in Diyala / Alkhalis, using loam soil to study the effect of three levels of foliar fertilization of iron chelate 0,100,200 mg L-1 and three levels 0f humic acid 0,1,2 g l-1 on yield of two varieties of sunflower (Helianthus annuus L.), Shemoos and Esihaki, sectors experiment applied according to randomized complete block design (RCBD).The results showed that Shemoos variety exceeded Esihaki in most of characters studied, when using levels of iron chelate. Results showed that sprayed iron concentration of 100 mg Fe L-1 caused significant differences in, disk diameter (19.37 cm), number of seeds per disk (1263.67 agrain), 1000 seeds weigh (89.53 g), plant yield (111.26g.plant-1) and total yield (5.18 ton.h-1) as a compared with control treatment. While using humic acid concentration 2 gm L-1 gave the highest results in number of seeds per disk (1182.62 agrain), 1000 seeds weigh (83.59 g) and plant yield (99.87 g plant-1), as a compared with control treatment. The results showed that the interaction between fertilization with iron chelate and humic acid has gave the highest results in most characters studied, as compared with control treatment.