Effect of various organic nutrition methods on potato minituber production in aeroponic condition

Commercial production of seed potato tuber by means of traditional and conventional methods resulted in the spread of bacterial and fungal disease. In contrast, high cost of nutritional supply is one of the problems in the some methods such as aeroponic. Hence in order to study seed tuber potato production in aeroponic condition using substances with natural origim, an experiment was conducted with eight treatments as completely randomized design with three replications. The treatments were 1- Otazo nutritional solution, 2 and 3- Tea vermicompost solution with 1:5 and 1:10 ratio, 4- Vermi wash solution, 5 and 6- Liquid poultry manure with 2 and 6:1000 ratio, 7 and 8- Mixed solution as mixed of cow manure with fruits and plants waste with 2 and 6:1000 ratio. Among the tested organic nutritional solutions, the vemi wash and tea vermicompost be able to substitute for Otazo chemical solution due to their satisfactory function. Whereas nutritional elements absorbtion was interrupted in pH of higher than 7.3 and EC over than 2 dS/m, therefore, the most important reason for low yield in liquid poultry manure and mixed solutions were their pH (7.9 and 7.6 respectively) and EC about 3. According to the role of phosphorous in carbohydrates transfer from leaves to tubers, the more tuber yield can attributed to more phosphorous contents in vermi wash and tea vermicompost solutions compared with liquid poultry manure and mixed solutions.