Given the growing population of the world, meeting the nutritional and medicinal needs of plant products is very important. It is very important to pay attention to the effects of cultivation date and suitable cultivation area in order to provide the nutrients needed by plants to achieve high yield and desired quality crops. One of the most important factors in the growth and yield of potatoes is nutrition and determining the appropriate planting date according to the geographical area, which is one of the main objectives of the present study. The research was conducted as a split plot in the form of a randomized complete block design with three replications in Jihad Keshavarzi research farms located in Islamabad, Zahkloot and Kerman provinces. The main factor of geographical areas in the stages of flowering and tuber filling and the sub-factor including two planting dates (October 5 and 25) were examined. The results showed that the results of analysis of variance showed that the effect of area treatment, culture date and foliar application on the concentration of chlorophyll an and leaf carotenoids was significant. While it was not significant on chlorophyll b concentration. All bilateral effects except region on planting date were significant in chlorophyll a but not significant on tripartite effect. The highest concentration of chlorophyll a (34.1 mg / g fresh leaf) was obtained in foliar application of 1% iron nanoparticles with 2% magnesium nanoparticles
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