Doses of NPK formulations combined with humic substance at sowing in barley cultivars/Doses de formulacao de NPK combinadas com substancias humicas na semeadura em cultivares de cevada

• Published in: Revista brasileira de engenharia agrícola e ambiental Vol. 22; no. 10; p. 683
• Main Authors: Szeuczuk, Kathia, Mendes, Marcelo C, Stadler, Alan J, Pagliosa, Eduardo S, Schroeder, Bruno, Muller, Marcelo M.L
• Format: Journal Article
• Language: English
• Published: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior 01.10.2018
• Subjects: Brasil
• ISSN: 1415-4366; 1807-1929
• DOI: 10.1590/1807-1929/agriambi.v22n10p683-688

This study aimed to evaluate NPK formulations used in fertilization at sowing associated with and without humic substances (HS) in terms of the agronomic characteristics and grain quality for malt from the barley cultivars BRS Brau and BRS Elis, focusing on the agricultural years 2015 and 2016 in Guarapuava, PR. The experimental design was a randomized block, in a factorial 5 x 2 format, with five fertilizations: 0 kg [ha.sup.-1] (control); 100 kg [ha.sup.-1] of NPK; 100 kg [ha.sup.-1] NPK + HS; 250 kg [ha.sup.-1] of NPK; and 250 kg [ha.sup.-1] NPK + HS, using two barley cultivars, BRS Brau and BRS Elis, replicated four times. The variables evaluated were hectoliter weight, grain yield, malt quality by means of sort 1, 2 and 3, and the protein percentage. The data evaluated were submitted to joint variance analyses for the agricultural crops, and the means were compared through non-orthogonal contrasts. The use of humic substances in NPK formulations provides an increase in grain yield, and its effect is observable in the lower doses of NPK + HS formulations. The lower dose of NPK formulation combined with the humic substance reduced class 1 and increased class 3 in agricultural crops from the years 2015 and 2016. The 2016 crop, with favorable climatic conditions, presented improved hectoliter mass, grain yield and quality of the barley grains, based on commercial grade. Key words: Hordeum vulgare NPK fertilization agronomic characteristics malt quality Objetivou-se avaliar doses de formulado NPK em adubacao de semeadura associadas ou nao a substancia humica (SH), nas caracteristicas agronomicas e qualidade de graos para malte, nas cultivares de cevada BRS Brau e BRS Elis, nas safras agricolas de 2015 e 2016, em Guarapuava, PR. O delineamento experimental foi em blocos ao acaso, em esquema fatorial 5 x 2, sendo cinco adubacoes: 0 kg [ha.sup.-1] (controle); 100 kg [ha.sup.-1] de NPK; 100 kg [ha.sup.-1] de NPK + SH; 250 kg [ha.sup.-1] de NPK; 250 kg [ha.sup.-1] de NPK + SH, em duas cultivares de cevada BRS Brau e BRS Elis, em quatro repeticoes. Foram avaliadas a massa hectolitrica e produtividade de graos e a qualidade de malte por meio das classes 1, 2 e 3 de graos e teor de proteina. Os dados avaliados foram submetidos a analise de variancia conjunta para as safras agricolas e as medias comparadas por meio de contrastes nao-ortogonais. A utilizacao de substancia humica em formulados NPK proporcionou aumento na produtividade de graos, sendo o seu efeito notado nas menores doses do formulado 100 NPK + SH. A menor dose do formulado NPK associada a substancia humica reduziu a classe 1 e aumentou a classe 3 nas safras agricolas de 2015 e 2016. A safra agricola de 2016, com condicoes climaticas favoraveis, apresentou melhor massa hectolitrica, produtividade de graos e qualidade dos graos de cevada, com base na classe comercial. Palavras-chave: Hordeum vulgare adubacao NPK caracteristicas agronomicas qualidade de malte