Phytotonic Effect of Fungicide Mixtures Applied at Different Periods in Sweet Corn

Estevam M Costa,Matheus V A Ventura,Roberto K Mortate,Rafael M Da Silva,Bruno M Nunes,Marcia R Oliveira,Mirian Nomura,Marcio M Bessa,Bruno H T Arantes,Jaíza F R Chagas,Victor H Moraes,Alessandra P A Lima

doi:10.5539/jas.v10n12p139

Abstract

The fungicides belonging to the chemical groups of strobilurins and triazoles have their contribution to increase the productivity of the crop by a phytotoxic effect. The objective of this study was to evaluate the effects of fungicides at different times on the quality and quality of the spikes. The experiment was conducted at the Universidade do Estado de Minas Gerais and the experimental design was in randomized blocks, with 4 replicates, factorial factorial 3 &times; 3 + 1, the first factor being composed of 3 combinations of fungicides and the 2 applications (49, 56 and 63 days after sowing-DAS) + 1 witness. The lot was composed of 4 rows spaced 0.45 m and the harvest was done manually at 83 DAS. The height of the plant, the height and the diameter of the glue in the first ear, total mass of ears with and without straw, grain mass per ear, length and diameter of the ears and productivity were evaluated. The data were analyzed by variance and as means compared by the Tukey test. The height of a plant was significantly affected throughout its life in the treatments at 63 days. The series were concentrated by the treatments are a non-spike mass, grain mass per spike and productivity, and pressure levels were loaded when they were performed at 63 DAS.

Highlights

Sweet corn (Zea mays subsp. saccharata) is a species of olive oil that has high added value and short cycle, since it is harvested green and is destined for human consumption, in natura or after industrial processing, due to its remarkable organoleptic characteristics like flavor sweetness of its grains
The objective of this study was to evaluate the physiological effects on plant phenology, spike characteristics and productivity, as a function of the application of different mixtures of fungicides belonging to the chemical groups of strobilurins and triazoles in different periods of application in sweet corn
The experimental design was a randomized complete block design (DBC) based on a 3 × 3 + 1 factorial scheme, with four replications, the first factor being composed of three application times and the second factor composed of three combinations of fungicides (Nativo®, Priori Xtra® and Opera®, all belonging to the chemical groups of Strobilurins + Triazoles) + 1 control

Summary

Introduction

Sweet corn (Zea mays subsp. saccharata) is a species of olive oil that has high added value and short cycle, since it is harvested green and is destined for human consumption, in natura or after industrial processing, due to its remarkable organoleptic characteristics like flavor sweetness of its grains. Sweet corn is unlikely to have occurred in the wild as a wild breed similar to other types of maize. It can be considered as a product of mutation, followed by domestication, as a new source of sugar would probably not be ignored by the indigenous tribes of various regions of South America, who would use sweet corn as a source of sugar (Parentoni et al, 1990). The difference between sweet corn and common corn is in the sugar and starch content of the endosperm. While common corn has around 3% sugar and between 60 and 70% starch, sweet corn has 9 to 14% sugar and 30 to 35% starch and the superdoce has around 25% sugar and 15 to 25% starch (Luz et al, 2014)

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