Morphological and Productive Evaluation of Mombasa Grass as a Function of Phosphate, Nitrogen and Biostimulant Application
Bruno Henrique di Napoli Nunes *
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Igor Ricardo Barbosa Teixeira
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
César Henrique Borges Gomes
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Daniella Inácio Barros
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Mariana Senna Quirino
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Helber Veras Nunes
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Ricardo Alencar Libório
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Paulo Victor Gomes Sales
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Liomar Borges de Oliveira
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Luis Fernando Pereira de Sá
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Caíque Rodrigues Alves
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Geovana Rodrigues Barbosa
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Fred Wallison Gomes Ribeiro
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
*Author to whom correspondence should be addressed.
Abstract
Nitrogen when applied to the surface, suffers losses by volatilization. Therefore, one of the ways to reduce this loss is to use substances that delay the hydrolysis of NH3. The objective of this study was to evaluate the physiological characteristics of Mombasa grass as a function of nitrogen sources associated or not with volatilization inhibitors (ASP4) and nitrification (CTN). The experiment was conducted in a greenhouse, UFT - Gurupi, in DBC, with six treatments and five replications, being: SN1 - Sulfammo without ASP4; SN3 - Sulfammo + 6kg/ton of ASP4; NC1 - Sulfammo + CTN without ASP4; NC3 - Sulfammo + CTN + 6kg/ton of ASP4, URE - Urea and control without nitrogen. It is note point that all treatments received 100 kg ha-1 of N. The following parameters were evaluated: Chlorophyll A, Chlorophyll B, Total Chlorophyll, internal CO2 concentration, transpiration rate, stomatic conductance, CO2 assimilation rates, water use efficiency, and instantaneous efficiency of ribulose enzyme (RUBI) carboxylation Data were analyzed by MANOVA, using the main component technique (PCA) using the R® 3.5 software. According to the PCA scores, the productive characteristics are CloB; CloA; CloTO. ASSI, RUBI showed the highest variations, all positive, both in PC1 and PC2. The treatments that most influenced the characteristics were NC1 and NC3, demonstrating an inverse tendency to the controls. Crop development was significantly influenced by urea and sources with and without inhibitors.
Keywords: Multivariate analysis, sulfammo MeTA, forage grass