Influência de tempos de contato de sementes de milheto com cloreto de potássio e superfosfato simples na germinação e crescimento inicial

Abstract

Millet is an annual forage grass that requires high temperatures to complete its cycle and stands out for its regrowth capacity, excellent tiller production and upright growth, characteristics that make it an excellent option for soil cover in no-tillage systems. The objective of this study is to evaluate the effect of contact times of different fertilizers on the physiological quality of pearl millet seeds. The experiment was carried out at the State University of Piauí, Teresina, PI, at the Center for Agricultural Sciences. Two experiments were conducted: (i) contact time of pearl millet seeds with potassium fertilizer (potassium chloride), (ii) contact time of pearl millet seeds with phosphate fertilizer (single superphosphate). The treatments of both experiments, consisting of different contact times of the fertilizer with the millet seeds: 0, 3, 6, 9, 24, 48 and 72 hours, were distributed in a completely randomized, with four replications. The response variables were the number of emerged plants (7 and 28 days), IVG, germination percentage, plant height (7 and 28 days), root length (28 days), fresh and dry mass (28 days) and indirect chlorophyll measurement (28 days). As the contact times with fertilizers go by, there is a reduction in IVG, germination percentage, biometrics, biomass and CRI. To minimize damage, it is recommended that mixing millet seeds with fertilizers, especially simple superphosphate, be followed by immediate sowing. The use of KCl also requires caution, avoiding prolonged contact times.