Desenvolvimento de copo-de-leite cultivado em substratos com diferentes fontes e doses de potássio

Abstract

Recently, alternatives are sought to reduce Brazilian dependence on the import of fertilizers for use in agricultural activities. In this context, had as objective to evaluate the agronomic effectiveness of alternative potassium sources, derived from calcined verdigris, for the culture of the calla lily. The treatments were a combination of three potassium sources: verdigris branny 'fresh', Termpotassium granulated and Termpotassium slim branny, four potassium dosage: 0, 205, 410 and 820 mg dm-3 and 2 substrates: natural soil and soil plus 30% of manure in volume. The additional treatments were consisted for 410 mg dm-3 of potassium in the form of KCl (potassium chloride) on both substrates. The experiment was conducted in a completely randomized design in factorial 3 (sources of potassium) x 4 (potassium dosage) x 2 (substrates), totaling 24 treatments over two additional treatments. Four replicates were used with 1 plant per plot. At 180 days of cultivation, the plants were evaluated for growth characteristics of the shoot, inflorescence production and nutrient content in shoot dry mass. The sources Termpotassium granulated and Termpotassium slim branny provide good plant growth like the use of KCl. The substrate soil plus manure promotes improvements in the development and plants production of calla lily