Biomass and grain yield of oats by growth regulator

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.

Agronomic performance of white oats cultivated under fertigation with treated sewage effluent and definition of critical limits of Normalized Difference Vegetation Index

“…It was observed that only the treatment E1 resulted in lower plant height (p < 0.05), probably due to small amount of nutrients applied during this treatment. An effective way of controlling the lodging of white oats without interfering with their yield is to use growth regulators (Marolli et al 2017). In addition, the use of small-sized plants and regionallyadapted genotypes may decrease lodging of the crop.…”

A Proposal of Oat Productivity Simulation by Meteorological Elements, Growth Regulator and Nitrogen

“…The harvest index is an important indicator of productivity, dimensioning how much of the total biomass produced was directed to the elaboration of biomass straw and biomass grains [20]. Seed density [20], nitrogen fertilization [5] and growth regulator [6] are the main management factors that affect the expression of the harvest index of oats. Reference [2] point out that the reduction in the oat harvest index in favorable year to cultivation is due to the greater favoring of the expression of the vegetative growth, although the grain productivity also increased, therefore, justifying that the increase in grain productivity does not express a behavior similar to that of the biological productivity, reducing the harvest index due to the higher volume of biomass straw.…”

“…Reference [2] point out that the reduction in the oat harvest index in favorable year to cultivation is due to the greater favoring of the expression of the vegetative growth, although the grain productivity also increased, therefore, justifying that the increase in grain productivity does not express a behavior similar to that of the biological productivity, reducing the harvest index due to the higher volume of biomass straw. In wheat [28] and oats [6], the growth regulator increased the expression of the harvest index by the reduction of the straw biomass and the shortening of the stem.…”

“…Oat grains productivity is dependent on the genetic potential of the cultivars, management technologies, climate and favorable soil [3] [4]. Among the management technologies, nitrogen plays a decisive role on the productivity of biomass and grains [5] [6]. The new biotypes of oats are highly responsive to the use of nitrogen in the productivity expression [2] [3] [4].…”

“…An alternative used in cereals such as rice [9], wheat [10] and oats [6], is the use of growth regulators, which are chemical compounds that make stem more resistant to breaking and lodging without decreasing grain productivity [11].…”