Growth regulator on oat yield indicators

Abstract

Growth regulator in oat can reduce lodging with effects on yield indicators. The objective of the study is to define the optimum dose of growth regulator to reduce lodging in oats under different conditions of nitrogen (N) fertilization (reduced, high and very high) and the effects on yield indicators in the succession systems. In each succession system (soybean/oats and corn/oats), two experiments were conducted, one to quantify biomass yield and the other to estimate grain yield and lodging. In the four experiments, the design was randomized blocks with four replicates in 3 x 4 factorial scheme, for N-fertilizer doses (30, 90 and 150 kg ha-1) and growth regulator doses (0, 200, 400 and 600 mL ha-1), respectively. Growth regulator reduces lodging in oat plants, with the ideal doses of 500 mL ha-1 in the soybean/oat system and 400 mL ha-1 in the corn/oat system, regardless of the reduced, high and very high N doses. There is a linear reduction of biological and straw yields, and a quadratic trend in the expression of grain yield and harvest index as a function of the growth regulator doses, regardless of succession systems (soybean/oats and corn/oats).

Research Article A combination of regression and internal point methods as a hybrid model for estimating oat plant productivity

“…This fact occurs due to the compromised efficiency of nitrogen absorption, aimed at the elaboration of yield components (Mantai et al, 2016;Costa et al, 2018). In addition, excessive rainfall in the grain filling phase contributes to plant lodging and reduced quality, resulting in yield losses (Kaspary et al, 2015;Krysczun et al, 2017).…”

“…High yield of oats depends on the genetic potential of the cultivars, management technologies, and favorable climate and soil for growing (Hawerroth et al, 2015;Krysczun et al, 2017). Among the management technologies, nitrogen fertilization stands out, as it is the nutrient most absorbed by cereals and most directly linked to yield.…”

“…Lodging is the phenomenon in which the plant loses its vertical orientation, leans and falls to the ground, resulting in curved plants or even stem breaking. Lodging leads to losses in grain yield and quality and difficulties at harvest (Chavarria et al, 2015;Krysczun et al, 2017). In an effort to minimize lodging, the use of growth regulators in crops such as crotalaria (Kappes et al, 2011;Araújo et al, 2018), rice (Alvarez et al, 2014;Goes et al, 2015), wheat (Schwerz et al, 2015;Ferreira et al, 2017) and oats (Guerreiro and Oliveira, 2012;Hawerroth et al, 2015;Marolli, et al, 2017b) has been studied.…”