The Comparison of Organic and Biologic Fertilizers Effects on Growth and Essential Oil of Dill (Anethumgraveolens L.)

Abstract

In order to study the effect of plant growth promoting Rhizobacteria, seaweed extract and humic acid on growth parameters and chlorophyll content of dill (Anethumgraveolens L.) a field experiment was done in the form of factorial in randomized complete block design (RCBD) in research field of Islamic Azad University, college of agriculture and natural resources branch of karaj, Mahdasht, Iran in 2012. The treatments were: A) humic acid with three levels, B) plant growth promoting Rhizobacteria with two levels, C) seaweed extract with two levels.The results showed that application of humic acid cause to increase in fresh weight, dry weight, height, root fresh weight, root dry weight, chlorophyll a and essential oil of dill. The highest amount of fresh weight (3.06 kg/m2), dry weight (0.23 kg/m2), plant height (67.7 cm), chlorophyll a (0.058 mg/l), root fresh weight (19.89 gr/m 2 ), root dry weight (4.98 gr/m 2 ) and essential oil (0.58 %) were found at 6 l/ha humic acid. According to the mean comparison of interaction effect between humic acid levels, plant growth promoting rhizobacteria and seaweed extract it is seen that among the treatments,soil application of humic acid 6 lit/ha+ application of plant growth promoting rhizobacteria and seaweed has the maximum amount of all evaluated traits. Overall, results illustrated that humic acid affected growth parameters and essential oil of dill plant more than plant growth promoting rhizobacteria and seaweed extract.