This study aimed to diagnose the contents of macronutrients nitrogen, phosphorus, potassium, calcium and magnesium in the leaves of guava, under different irrigation depths (1144, 1465, 1785 and 2106 mm in the first cycle, and 915, 1308, 1686 and 2093 mm in the second productive cycle) and levels of nitrogen fertilizer (50, 100, 150 and 200 kg ha-1). Only isolated effects of the factors (water depths and nitrogen fertilization) were verified on the concentrations of the studied micronutrients. The water depth exercised positive linear effect on the phosphorus concentration and quadratic effect on the concentration of magnesium in both productive cycles, while the nitrogen fertilization did not influence the contents of these elements. The potassium concentration showed the quadratic effect of the water depth in the first cycle and of the nitrogen fertilization in the second one. The water depth had a positive linear effect on calcium just in the second cycle, whereas the effect of the nitrogen fertilization was quadratic only in the first cycle. The effect of the nitrogen fertilization on the concentration of nitrogen was quadratic in the first cycle and positive linear in the second one; however, the water depth did not exercise any effect.
Psidium guajava L.; brazilian horticulture; nutrition of plants; localized irrigation
