SUBSTÂNCIA HÚMICA ASSOCIADA À DOSES DE FORMULADO NPK NA CULTURA DA CEVADA

• Autor(a) principal: Szeuczuk, Kathia
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do UNICENTRO
• Texto Completo: http://tede.unicentro.br:8080/jspui/handle/jspui/949
• topic: Hordeum vulgare; ácido húmico e produtividade de grãos; adubação de base; Hordeum vulgare; humic acid and grain yield; base fertilizer; CIENCIAS AGRARIAS::AGRONOMIA

The aim was to evaluate the use of doses of sowing formulations, with and without humic substances, in barley cultivation in the no - tillage system, in the 2015 and 2016 agricultural crops, and the effect on the agronomic characteristics, macronutrient exportation and grain quality for malt. The experimental design was a randomized complete block with four replications, in a factorial 5 x 2 (5 fertilizations x 2 cultivars). The following fertilizations were: fertilization 1 (control): 0,0 kg ha-1; fertilization 2: 100 kg ha-1 of NPK; fertilization 3: 100 kg ha-1 NPK with 5% humic substance (HS); fertilization 4: 250 kg ha-1 NPK; fertilization 5: 250 kg ha-1 NPK + HS, to two barley cultivars (BRS Brau and BRS Elis). The following characteristics were assessed: number of tillers, number of grain per spike, hectoliter weight, thousand grain weight, grain yield, content macronutrients N, P e K in grains and grains classification. The data of the evaluated characteristics were submitted to the test of homogeneity of the variables by the Harley test, the means were submitted to analyzes of individual variance and later to joint analyzes for the agricultural crops and was compared by Tukey test, for 5% probability. Subsequently, nine no-orthogonal contrasts were performed. The agricultural crop, with favorable climatic conditions, (2016) positively influenced the hectoliter weight for sowing fertilizations with NPK formulations, with and without humic substance. The 250 kg dose of the NPK formulation, with and without humic substance, increased grain yield and was dependent on the evaluated crop and crop yield. The 250 kg dose of the NPK formulation with humic substance, increased the nitrogen export to barley grains, being the highest levels in the BRS Brau cultivar and in the unfavorable climatic conditions (2015). The agricultural crop, with favorable climatic conditions, improved the quality of the barley grains, based on commercial grade.