Journal of Food, Agriculture and Environment

Effects of nitrogen rates and timing of nitrogen topdressing applications on the nutritional and agronomic traits of sweet corn

Author(s):

Ricardo Shigueru Okumura ¹, Pedro Soares Vidigal Filho ²*, Carlos Alberto Scapim ², Odair José Marques ¹, Antônio Augusto Nogueira Franco ¹, Renan Soares de Souza ¹, Deivid Lincoln Reche ³

Recieved Date: 2014-02-03, Accepted Date: 2014-03-28

Abstract:

The aim of this study was to evaluate the effects of nitrogen rates and times of nitrogen topdressing applications on the growth and development of sweet corn hybrids. In this study, randomized complete block designs in a factorial 5 × 2 × 2 arrangement with four replications were applied. The treatments consisted of a combination of three rates of N (0, 45, 90, 135 and 180 kg  N ha^-1) and the time of application (V₄ and V₈ stages) of  two sweet corn simple hybrids (Tropical Plus and RB-6324) and in a particular growing season for assessment (2009, 2010 and 2011) during the spring-summer period. Joint analysis of the data indicated that the plant height, leaf area index, total foliar N content, yield of marketable ears and kernel protein content were influenced by N rates. A rate of 110.84 kg N ha^-1 applied in topdressing afforded a maximum yield of marketable sweet corn ears (10.41 Mg ha^-1), regardless the time of the application of nitrogen, the type of hybrid or the growing season year studied. The maximum economic efficiency of the study conditions was at a rate of 102.5 kg N ha^-1. Rates of 45 and 90 kg N ha^-1 provided the best economic returns, with US$ 1,147.04 ha^-1 and US$ 501.76 ha^-1, respectively. The sweet corn hybrid RB-6324 was superior to the Tropical Plus in terms of yield for both dehusked ears and marketable corn ears.

Keywords:

Zea mays L., special corn, nitrogen fertilization

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Agriculture
Pages: 391-398

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