Estimativa do acúmulo de fitomassa da soqueira de cana-de-açúcar fertirrigada com doses de n-fertilizante utilizando modelo de simulação
Alternative titleEstimate of biomass accumulation in sugarcane ratoon using simulation model in the irrigated and rainfed managements with different doses of n-fertilizer
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With the key role that the sugarcane industry has on the national level is vital to know how the quantity and quality of raw material produced is affected by the cultural practices. However it is not always possible to obtain real data (time, cost, difficulty of access) appearing simulation models. So this study aimed to: use and validate the APSIM® (Agricultural Production System sIMulator) and make estimates (simulations) of accumulation of biomass and productivity of ratoon sugarcane, in irrigated and rainfed conditions with different doses of N fertilizer. The experiment was carried with 6 treatments: T1 (Irrigated without dose of nitrogen (N)), T2 (irrigated with a dose of 70 kg ha-1 N), T3 (irrigated with a dose of 140 kg ha-1 N), T4 (irrigated with a dose of 210 kg ha-1 N), T5 (non-irrigated without N rate) and T6 (non-irrigated with a dose of 140 kg ha-1 N), all doses of N as urea. Comparisons tons of cane per hectare (TCH), of sugar per hectare (TPH), of dry weight of shoot (PA) and stem (C). The APSIM simulated parameters evaluated with high correlation. The curves of biomass accumulation followed the sigmoidal characteristic trend and show the positive effect of irrigation and nitrogen fertilization.