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This thesis was carried out in order to observe the effect of certain nutrients on the growth, nutrition and disease resistance of tomato plants. For this purpose, an experiment was carried out in the greenhouse of the farm of the International University of Greece during the period of April-July. The plants we used came from a nursery and were then planted in pots with farm soil. This was followed by the separation of the plants into 19 groups of 6 plants and after watering and the growth of the plants at a satisfactory stage, then the first spraying of the plants began and the others followed, every 2 weeks with a final number of 4. After the end of the sprayings, the height, weight and chlorophyll of the plants were measured, the measurements were recorded and transferred to the laboratory to highlight the final results and to draw the conclusions. The results of the effect of the preparations were impressive and are analyzed in the experimental part of the work.