Nutrient deficiency and effects of various nutrition technologies on crop health

For the purpose of the healthy development of crops, it is necessary for all nutrients to be in balance. The appropriate condition of crops can be ensured by optimum and satisfactory supply of nutrients, since the ability of defense against biotic and abiotic stress is improved. For instance, it has been known for a long time that optimal P-and K supply can strengthen the health of crops (Perrenoud, 1990). Although it is not possible to defend diseases with only nutrition itself, however, professional supply of nutrients is elemental part of integrated crop protection in order to prevent and treat diseases (Reuveni and Reuveni, 1998). Basically, development of nutrient deficiency is due to the lack of each nutrients of cells. In case of absence of essential elements –such as N, S, P, Mg, Ca (essential cell components), the development and growth of the crops can be disturbed (Table 1; Füleky and Sárdi, 2014). In general, the observation one-year, fast-growing and plants which require many nutrients show the symptoms of nutrient deficiency often, therefore, it is not surprising that nutrient deficiency was determined in vegetables at first (for instance, Ca-deficient tomatoes) (Bergmann, 1979).