In order to obtain: - The deficiency symptoms of macronutrients and boron; - The analytical levels in the plant or parts of the under mineral deficiencys conditions. One greenhouse experiment was carried out Melon plants were cultivated in pots containing pure quartz and irrigated with nutrient solutions with different composition consisting of "complete solution", lacking N, P, K, Ca, Mg, S and B. Once the deficiencies were clearly identified the plants were harvested divided into roots, stem, leaves and "flower + fruits". The material was dried at 80°C, weighted and analyzed for the elements. The main conclusion are: The malnutrition symptoms were clearly identified for each element; The omission of nutrients affected the plant growth. The levels of nutrients in sound leaves, expressed in dry matter were: N% 2.30-3-30; P% 0.28-0.62; K% 2.53-2.87; Ca% 2.59-5.14; Mg% 0.79-0.99; S% 0.22-0.24; B ppm 65-111. The levels of nutrients in unsound leaves expressed in dry matter were: N% 1.11-2.21; P% 0.12-0.23; K% 0.86-1.72; Ca% 0.85-2.22; Mg% 0.60-0.71; S% 0.17-0.19; B ppm 54.7-101.