Abstract
ABSTRACT The use of growth regulator in oats can reduce plant lodging with reflections in biomass and grain yield. The objective of the study was to determine the feasibility and efficiency of using Trinexapac-Ethyl regulator in the growth of white oat under different conditions of N-fertilizer and years favorable and unfavorable for cultivation. In this study, two experiments were conducted in the years 2011, 2012 and 2013, one for quantifying biomass production rate and the other for the determination of grain yield and lodging. The experimental design was randomized blocks with four replicates, in a 4 x 3 factorial scheme, for growth regulator doses (0, 200, 400 and 600 mL ha-1) and nitrogen doses (30, 90 and 150 kg ha-1), respectively. There is a linear reduction of biomass rate with the increase in the growth regulator dose in oat, regardless of the condition of year and use of N-fertilizer. The growth regulator dose of 495 mL ha-1 efficiently reduces lodging with reduced, high and very high use of N-fertilizer, without reducing the yield of oat grains, in favorable, intermediate or unfavorable year for cultivation.
Highlights
The high yield of oat grains depends on a set of factors, such as technologies of management, climate and soil (Boschini et al, 2011; Fontaneli et al, 2012)
Fertilization with N-fertilizer is necessary due to the inefficient amount released by the soil and because it is the nutrient most absorbed by cereals (Costa et al, 2013; Hawerroth et al, 2015)
Sowing was performed in a soybean/ oat system from May 15 to June 30, using a seeder-fertilizer, to form the plots with five 5-m-long rows spaced by 0.20 m, totaling an experimental unit of 5 m2
Summary
The high yield of oat grains depends on a set of factors, such as technologies of management, climate and soil (Boschini et al, 2011; Fontaneli et al, 2012). Lodging is the phenomenon in which the plant loses its vertical position, tipping and falling on the soil, which directly affects the yield and quality of oat grains, compromising harvest (Silva et al, 2012; Hawerroth et al, 2015). It is a characteristic that involves the interaction of innumerous factors, such as wind, rainfall, soil, plant density, genetic resistance and management techniques (Silveira et al, 2011; Silva et al, 2015). One alternative adopted in graminee crops like rice (Arf et al, 2012) and wheat (Schwerz et al, 2015) has been the use of growth regulators that modify the internode distance and plant architecture, making the stem more resistant to breaking and lodging (Hawerroth et al, 2015)
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