evaluation amino acids and iron nano particles on photosynthetic pigments and yield of potato

the presented study aimed at investigating the effect of foliar application of amino acids and nano particles and chelated iron on photosynthetic pigments and yield of potato. to this end a factorial experiment was carried out in the form of randomized complete block design with three replications in 2013, in the research field of natural resources institute in damavand, iran. the first factor included application and non-application of amino acid (botamisol 45%) and the second factor included five levels of iron fertilizer: lack of iron (control), soil application of iron nano particles, foliar application of iron nano particles, soil application and foliar application of iron nano particles, soil application and foliar application of chelated iron. the results showed that the effect of both factors of amino acid and iron fertilizer on all the studied traits was significant at 1% level. moreover the best results of the studied traits were obtained with application of different levels of amino acid compared with control treatment. soil application and foliar application of iron nano particles, were the best treatment to achieve the best results, application of iron nano particles, either soil or foliar application had a better effect rather than chelated iron. finally the interactive effect of amino acid and iron fertilizer indicated that application of amino acid, foliar application, and soil application of iron nano particles had the best effects on chlorophyll a, total chlorophyll, and tuber yield.