Nutrição mineral de plantas ornamentais I : absorção de nutrientes pela cultura de gladíolos

Abstract

Gladiulus corms nº 3 (Gladiolus communis var. Itapetininga) were germinated in pots containing 7 kg of quertz. After germination the plants were irrigated several times a day with HOAGLAND & ARNON (1950) complete solution. Fifteen days after germination plant were harvested every ten days and subdivided in: aerial part, mother corms, daughter corm and bulbils. The different parts of the plants were weight and analysed for nitrogen, phosphorus, potassium, calcium, magnesium, sulphur, boron, copper, iron, manganese and zinco. It was observed that gladiulus plant show a fast growth period until fifty-five days. After this period is shows only increase in weight until seventy five days. A gladiulus plant at final cicle presents 362.6 mg of N; 78.4 mg of P; 536.4 mg of K;73.4 mg of Ca; 27.9 mg of Mg; 35.9 mg of S; 1,019.4 of B; 94.7 ug of Cu; 1,655.6 ug of Fe; 914.6 ug of Mn and 272.3 ug of Zn.