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.…”

Effect of indolebutyric acid on in vitro root production of Psychotria ipecacuanha (Brot.) Stokes (Rubiaceae)

“…The use of adequate growth regulator dosages is very important because the optimum concentrations vary by species and with various types of synthetic inductors (23) . After treatment of the stem base with the rootinducing growth regulator, the carbohydrates translocated to the treated area, increasing the rate of respiration and resulting in transformation of the carbohydrates and organic nitrogen compounds.…”

Seeding density and lodging control using a calcium and potassium-based organomineral fertilizer in oat crops

“…The use of high seeding density in favorable years, combined with application of nitrogen fertilizers to increase grain yield, increases lodging in oat plants. Lodging is a complex phenomenon; the plant loses its vertical position, leaning and falling towards the ground, which affects grain yield and quality and makes harvesting difficult (Hawerroth et al, 2015;Krysczun et al, 2017). Lodging can be caused by genetic factors combined with external factors, such as wind, rain, hail, soil, plant density, and other management techniques (Silva et al, 2015;Marolli et al, 2017).…”