Oat yield through panicle components and growth regulator

Abstract

The growth regulator modifies the expression of lodging and panicle components in oat plants, with reflexes in yield. The objective of this study was to define the optimal dose of growth regulator in oat for a maximum lodging of 5%. In addition, this study aimed to identify potential variables of the panicle to compose the multiple linear regression model and the simulation of grain yield in conditions of use of the regulator under low, high and very high fertilization with nitrogen. The study was conducted in 2011, 2012 and 2013 in a randomized block design with four replicates in a 4 x 3 factorial scheme, for growth regulator doses (0, 200, 400 and 600 mL ha-1) and N-fertilizer doses (30, 90 and 150 kg ha-1), respectively. The growth regulator doses of 395, 450 and 560 mL ha-1 are efficient, with maximum oat lodging of 5%, under low, high and very high nitrogen fertilization, respectively. The grain weight per panicle and panicle harvest index are potential variables to compose the multiple linear regression model. Multiple linear regression equations are efficient in the simulation of oat grain yield under the conditions of use of growth regulator, regardless of the N-fertilizer dose.

Research Article Dose and form of nitrogen supply in the relationship dynamics of wheat ear components with yield in cropping systems

“…The productive potential of cereals is influenced by the efficiency of absorption, remobilization and use of nitrogen, so that grain productivity is significantly increased by the proper management of the nutrient (Beche et al, 2014;Silva et al, 2016). In oat culture, panicle mass is the most effective in showing change, either because of the variability of cultivars or management that interferes with productivity (Kurek et al, 2002;Marolli et al, 2017). Mantai et al (2020a) used relative contribution analysis and observed that in oat culture panicle mass, panicle spikelet number and panicle grain mass have a greater contribution in promoting changes by increasing nitrogen.…”

Research Article The supply of nitrogen fertilizer in wheat to the highest environmental quality with satisfactory yield

“…The possibility of analyzing the behavior and simulations of the nutrient in the productivity biomass and grains can qualify more efficient and sustainable managements (Costa et al, 2018;Mamann et al, 2020). The definition of the N-fertilizer dose is a function of the organic matter content of the soil, the previous crop and the grain yield expectations (Mantai et al, 2016;Marolli et al, 2017). On the other hand, the most propitious time for top dressing falls only on the phenology of the plant linked to the period of greatest nutrient demand for the formation of yield components (Bredemeier et al, 2013;Pereira et al, 2018).…”

“…On the other hand, the most propitious time for top dressing falls only on the phenology of the plant linked to the period of greatest nutrient demand for the formation of yield components (Bredemeier et al, 2013;Pereira et al, 2018). The technical indications for wheat and oats in Brazil recommend the fertilization time between the beginning of the tillering (stage V 3 ) and the beginning of the elongation (stage V 6 ), an interval around 30 to 60 days after plant emergence (Arenhardt et al, 2015;Marolli et al, 2017). In oats, Mantai et al (2015) state that the maximum efficiency of nitrogen fertilization in top dressing is obtained when applied at the stage of 3 to 4 leaves with the total dose supplied from 70 to 90 kg ha -1 of nitrogen, this variation being dependent on the temperature and moisture conditions of the soil at the time of fertilization.…”

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

“…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. These regulators are chemical compounds that reduce the length of the inter-nodes by obstructing the biosynthesis of gibberellic acid, making the plant smaller in size and thickening the stem, favoring yield with significant reduction or even absence of lodging (Kaspary et al, 2015;Fagherazzi et al, 2018).…”