Growth and production of three potato cultivars as affected by organic foliar nutrition

An experiment was carried out in private farm in Radwaniah , 30 km westernsouth of Baghdad to test the impact of foliar spray by two organic fertilizers( Humistar and Vegeamino ) at three concentrations ( 0 , 1.0 and 1.5 ml.L-1 ) on three potato cultivars ( Ajiba , Riviera and Cardinal ) grade Elite . Plants were fertilized by using soil addition with N , P and K at rate of 120 : 60 : 200 kg.ha-1 applied to the soil. Foliar spray was applied twice to drip point , first at 45 days and second at 65 days post planting . Split – plot experiment design experiment was implemented where 15 treatment in each replication and three replicates were used. Results showed the domination of Ajiba cultivar plant length (88.42) cm and total leaf area (42.82)dcm2 . plant-1 , while Riviera cultivar had in plant greatest number of the main stem(4.69 stem.plant-1) , number of marketable tubers (6.91 tuber. plant-1), average marketable tuber weight (115.74 g.tuber-1 )and highest plant yield (834.12 g. plant-1 )