Abstract
ABSTRACT Fuzzy logic can simulate wheat yield by nitrogen and temperature nonlinearity, validating the use of hydrogel biopolymer. The objective of this study is to adapt the fuzzy logic model to the simulation of nitrogen biomass and wheat grain yield and non-linearity of the maximum air temperature, under the conditions of use of the hydrogel biopolymer, in high and low N-residual release systems. The study was conducted in 2014 and 2015, in Augusto Pestana, RS, Brazil (28 ° 26 ‘30’ latitude S and 54 ° 0 ‘58’ longitude W). The experimental design was a randomized block design with four replications in 5 x 5 factorial, for hydrogel doses (0, 30, 60, 90 and 120 kg ha-1), added in the furrow next to the seed, and N-fertilizer doses. (0, 30, 60, 90 and 120 kg ha-1), applied at the phenological stage V3 (third expanded leaf) as top-dressing, respectively. The pertinence functions together with the quantitative and linguistic values for the input and output variables are suitable for the use of fuzzy logic in the wheat yield simulation. The fuzzy model made it possible to estimate the values of biomass and wheat grain yield by nitrogen and non-linearity of the maximum air temperature under the conditions of use of the hydrogel biopolymer in high and low N-residual release systems.
Highlights
Among the meteorological elements, photoperiod, rainfall and air temperature are the most related to wheat productivity (Bischoff et al, 2015; Santi et al, 2018)
The pertinence functions together with the quantitative and linguistic values for the input and output variables are suitable for the use of fuzzy logic in the wheat yield simulation
The fuzzy model made it possible to estimate the values of biomass and wheat grain yield by nitrogen and non-linearity of the maximum air temperature under the conditions of use of the hydrogel biopolymer in high and low N-residual release systems
Summary
Photoperiod, rainfall and air temperature are the most related to wheat productivity (Bischoff et al, 2015; Santi et al, 2018). High temperature rapidly reduces soil moisture, implying an increased ratio of plant respiration rate and decreased photosynthesis efficiency. It intensifies N-fertilizer losses by volatilization (Scremin et al, 2017; Trautmann et al, 2017). It is noteworthy that nitrogen is the main nutrient absorbed by plants, by acting on different metabolic routes linked to the development of productivity components. One possibility of minimizing problems related to higher nitrogen efficiency is the use of biopolymers to maintain soil moisture (Fernandes et al, 2015; Scremin et al, 2017). Hydrogel biopolymers are biodegradable three-dimensional polymer networks, capable of retaining water in their gel-forming structure, able to hydrate and release water over a long period (Kaewpirom & Boonsang, 2006; Venturoli & Venturoli, 2011)
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