Topdressing nitrogen fertilization associated with trinexapac-ethyl on industrial quality of oat grains

José Henrique Bizzarri Bazzo,Klever Márcio Antunes Arruda,Carlos Roberto Riede,Inês Cristina de Batista Fonseca,Claudemir Zucareli

doi:10.1590/0034-737x202168010006

José Henrique Bizzarri Bazzo, Klever Márcio Antunes Arruda + Show 3 more

Open Access

https://doi.org/10.1590/0034-737x202168010006

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Abstract

Nitrogen fertilization, besides increasing productivity, can favor the production of well-formed, large, and heavy grains, which are traits valued by the oat processing industry. However, high nitrogen (N) doses may lead to plant lodging, which could be solved by using growth retardant. This study aimed to evaluate the industrial quality of white oat grains cultivated under different nitrogen doses and associated with the growth retardant trinexapac-ethyl in two growing environments. Experiments were conducted in Londrina and Mauá da Serra, PR, Brazil, using the cultivar IPR Afrodite in a randomized block design in a 4 × 2 factorial scheme and four replications. Treatments consisted of four topdressing N doses (0, 30, 60, and 90 kg ha−1) and the application or not of growth retardant. Thousand-grain weight, hectoliter weight, grain index greater than two millimeters, peeling index, and industrial grain yield were evaluated. The effect of N fertilization and growth retardant on the industrial quality of white oat grains depends on the characteristics of the growing environment. The trinexapac-ethyl application reduces grain quality in Londrina and Mauá da Serra. However, the industrial quality of grains is high in both growing environments when the growth retardant is associated with nitrogen doses.

Highlights

Nitrogen (N) is one of the quantitatively most essential elements for white oat (Kolchinski & Schuch, 2004) and an essential element for its growth and development (Mundstock & Bredemeier, 2001).Obtaining high yield levels and better industrial quality oat grains can be achieved using the nitrogen fertilization (Ceccon et al, 2004)
Kolchinski & Schuch (2004) worked with four grain white oat cultivars (CTC 5, UFRGS 15, UFRGS 19, and UPF 18) and four topdressing N doses (0, 24, 48, and 73 kg ha-1) and verified that the increased nitrogen fertilization positively influenced the industrial quality of oat grains
This study aimed to evaluate the industrial quality of grain white oat cultivated under different nitrogen doses and associated with the growth retardant trinexapac-ethyl in two growing environments

Summary

Introduction

Obtaining high yield levels and better industrial quality oat grains can be achieved using the nitrogen fertilization (Ceccon et al, 2004). Kolchinski & Schuch (2004) worked with four grain white oat cultivars (CTC 5, UFRGS 15, UFRGS 19, and UPF 18) and four topdressing N doses (0, 24, 48, and 73 kg ha-1) and verified that the increased nitrogen fertilization positively influenced the industrial quality of oat grains. The use of high N doses may influence a higher vegetative development and result in increased plant height, with consequent lodging, which negatively interferes with grain yield and quality (Zagonel et al, 2002; Zagonel & Fernandes, 2007; Penckowski et al, 2009). Among the strategies for using high N doses, without lodging, are the use of small-size cultivars or application of growth retardants (Penckowski et al, 2010)

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