Achieving organic phosphorus fertilizer by use of rock phosphate and humic acid
2014
Samavat ,Saeed | Tabakhian,Sheida
The experiments conducted to investigate the role of humic acid on phosphorus solubility from phosphate. Experiment was done with 4 treatments and 3 replications in a completely randomized design. treatments were: 1) two levels of moisture content (field capacity and saturation) ,2) cow manure at three rates (20,40,60 percent) , 3 ) two kinds of phosphate rock (crude and condensate) , 4) three times (15,30, 60 days) was performed. The results showed that the effect of treatments such as moisture, percent incorporation of humic acid , rock phosphate and the amount of soluble and insoluble phosphorus was significant . Citrate soluble phosphorus levels in all treatments was more than water soluble and non -soluble citrate . Effect of humic acid on the citrate -soluble phosphorus in the raw rock phosphate and concentrated rock phosphate was less than control . Interactions of humic acid , moisture, rock phosphate and times showed that the greatest amount of soluble phosphorus was in 30 days , condensed rock phosphate , saturated moisture percentage and humic acid concentration was 2% . The highest water-soluble phosphorus was in field capacity moisture content , condensed rock phosphate , 6% humic acid and at 60 days.
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