Dry matter and nutritional limitaçíμes corn in a yellow Oxisol under secondary forest and agroforestry system
Abstract
The replacement of natural forest by alternative forms of land use in the Amazon has
generated ecological implications related to the use of natural resources on which agriculture and the
forestry sector has been hard hit. The aim of this study was to evaluate the production of dry matter
and limiting nutrient for growing corn (Zea mays L.) of Oxisol under forest
secondary and agroforestry. The experiment was conducted in a greenhouse at the University
Federal Rural da Amazônia, using a completely randomized design with
treatments arranged in a factorial 2x10 (two systems of land use - agroglorestal system and secondary forest (cocoa consortium - Theobroma cacao, peach palm Bactris-gasipaes and Gliricidia sepium gliricidia-) and 10 treatments under the missing nutrient technique:. witness (natural soil); complete fertilizer with macro and micronutrients; complete fertilization liming; omission of one element in each (N, P, K, Ca, Mg and S) and micronutrients in the complete omission of treatment in 4
repetitions. The dry matter production of corn increased due to fertilization and liming, being generally higher in the soil of the area under agroforestry. The omission of P and K caused the greatest limitations on the dry weight of shoots of corn, regardless of the land use system.
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