Simulation of oat development cycle by photoperiod and temperature

Abstract

A B S T R A C TThe simulation of oat development cycle can be used in the planning of agricultural practices. The aim of the study was to simulate and validate the duration of oat development cycle by photoperiod, temperature and coefficients of development of wheat for use in the WEStreck model, considering different doses of N-fertilizer and systems of succession of high and low C/N ratio. The study was conducted in 2015 in a randomized block design with four replicates in a 4 x 2 factorial scheme, corresponding to N rates (0, 30, 60 and 120 kg ha -1 ) and oat cultivars (Barbarasul and Brisasul), respectively, in the soybean/oat and maize/ oat systems. The duration of the stages from emergence to anthesis and from anthesis to maturation of oats was simulated in the WE-Streck model. The minimum, optimum and maximum temperatures that effectively simulate the oat development cycle were 4, 22 and 30 °C from emergence to anthesis and 15, 25 and 35 °C from anthesis to maturation, respectively. The intermediate-cycle oat development was efficiently simulated by the WEStreck model using coefficients developed for wheat, with vegetative and reproductive cycles estimated at 89 and 43 days, respectively. Simulação do ciclo de desenvolvimento da aveia por fotoperíodo e temperatura R E S U M OA simulação do ciclo de desenvolvimento da aveia pode ser utilizada no planejamento de práticas agrícolas. Objetivou-se simular e validar a duração do ciclo de desenvolvimento da aveia por intermédio de fotoperíodo, temperatura e coeficientes de desenvolvimento do trigo para uso no modelo WE-Streck, considerando diferentes doses de N-fertilizante e sistemas de sucessão de alta e reduzida relação C/N. O estudo foi conduzido em 2015, em delineamento de blocos casualizados com 4 repetições em esquema fatorial 4 x 2 para doses de nitrogênio (0, 30, 60 e 120 kg ha -1 ) e cultivares de aveia (Barbarasul e Brisasul), respectivamente, no sistema soja/aveia e milho/aveia. No modelo WE-Streck foi simulada a duração das fases emergência à antese e antese à maturação da aveia. As temperaturas mínima, ótima e máxima que simulam com eficiência o ciclo de desenvolvimento da aveia da emergência à antese, foram 4, 22 e 30 °C, respectivamente e da antese à maturação 15, 25 e 35 °C, respectivamente. A simulação do desenvolvimento da aveia de ciclo médio pelo modelo WE-Streck foi eficiente usando coeficientes desenvolvidos para o trigo, com ciclo vegetativo e reprodutivo estimado em 89 e 43 dias, respectivamente.

Black Oat (Avena strigosa Schreb.) Ontogenesis and Agronomic Performance in Organic Cropping System and Pannonian Environments

“…The duration of the fruit development stage, specifically grain filling, is significantly influenced by environmental factors, primarily by high temperatures, which shorten this period [22]. These results are in accordance with previous findings of several authors [31][32][33]. Gonçalves et al [31].…”

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

“…The temperature acts as a catalyst for biological processes, which is why plants require a minimum and maximum temperature for normal physiological activities [23]. According [24], the maximum temperature for the development of the oat crop is 35˚C, and the minimum temperature is 0˚C. In oats, the favorable climate is described as one with milder temperatures and radiation quality in favor of tillering and grain filling, without occurrence of rains in great quantity and intensity, however, favoring the adequate supply of moisture stored in the soil [4]- [19].…”

“…Also, they do not simultaneously involve plant-related variables, the meteorological condition, and important management practices that affect grain productivity [4]- [15]. Therefore, the elaboration of an efficient simulation model of oat grain productivity through the nitrogen use, growth regulator and variables related to plant and climate can be an important tool in the definition of more efficient forms of management, as well as allowing the development of applications for productivity simulation in mobile devices and for harvest estimation in inspections from warranty programs of agricultural activity.…”

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

“…Oats are considered a multi-purpose cereal, used for soil cover due to the high volume of straw it produces (Godoy et al, 2016;Queiroz et al, 2017), and for animal feed in the form of pasture, hay, silage, and as an ingredient of feed concentrates (Romitti et al, 2017;Dornelles et al, 2018). For human consumption, it is possible to produce numerous products, with nutritional and functional qualities superior to those of other cereals (Sancho and Pastore, 2016;Mantai et al, 2017). Therefore, the high demand for grain and derivatives has resulted in an increase in the crop area, as well as increases in yield through the use of new technologies (Arenhardt et al, 2017;Scremin et al, 2017).…”

“…The need to supply this nutrient via synthetic fertilizers is highlighted due to the insufficient quantity released by the soil during the growing cycle Costa et al, 2018;Veçozzi et al, 2018). However, although increases in nitrogen doses, along with favorable weather conditions, favor increased grain yield, they also promote vegetative growth, facilitating lodging (Kaspary et al, 2015;Mantai et al, 2017).…”