عنوان مقاله [English]
This experiment was conducted to study the effect of effective organism (EM) application on efficacy of chemical and organic fertilizers in corn cultivation and their effects on yield as a factorial experiment on the base of complete randomized block design with four replications in research field of agricultural research center of Arak, Iran. Experimental factors were EM concentration included of three levels (0, 1:20 and 1:50) and type of fertilizer included of no application, fertilizer contain nitrogen, phosphorous and potassium (NPK: 300-135-100 kg/ha) and domestic manure (20 ton/ha). According to the results, the effect of type of fertilizer on all criteria and EM concentration on all of them except to length of maturity duration were significant. Interaction of fertilizer type and EM concentration was significant on plant height, leaf area index, nitrogen, phosphorous and potassium percentage of shoot, seed protein percentage and yield of dry and wet provender. On the base of results, simultaneous application of EM and domestic manure caused to increase necessary elements uptake of plant. So, yield of dry and wet provender was increased due to improvement of plant growth conditions. Difference between domestic manure and NPK on the point of nutrient uptake and yield of provender was high and significant in no EM application, low in 1:20 concentration of EM and non-significant in phosphor and potassium concentration and yield. According to the results, domestic manure efficacy was increased due to using effective microorganisms. So, in addition to yield increase, it caused to prevent chemical pollution due to using chemical fertilizer.