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The objective of this work was to evaluate the effect of different doses and modes of application of piggery waste in the early development of maize plants. The experiment was carried out in a greenhouse using a randomized block experimental design, with treatments arranged in a 6x2 experimental scheme. Factors consisted of six doses of piggery waste (0, 20, 30, 40, 50 and 60 m-3 ha-1) and two modes of application (incorporated into the soil and placed on the surface), with four replications. The following characteristics were evaluated during the experiment: plant height, stalk diameter, fresh and dry weight of shoots and roots, and root volume. Piggery waste doses led to increases in all analyzed variables, but no statistical difference was found between the modes of application, which indicates that applying the waste on the surface or incorporating it into soil did not result in significant agronomic changes.       Key words: Organic fertilizing, Zea mays, animal waste.

Effects of piggery waste doses and modes of application in the early development of maize plants