Abstract
The objective of this work was to evaluate the production costs and profitability indexes of sorghum crop for silage production under different irrigation depths. The work was conducted at the Federal Institute of Education, Science and Technology of Ceará (IFCE) – Umirim Campus, from September to December 2016. The treatments were arranged in 5 x 5 split plots with 5 replications. Irrigations were performed on a daily basis, and the applied depths were calculated based on crop evapotranspiration (ETc). The primary treatments were 50, 75, 100, 125 and 150% of ETc, associated with different levels of carnauba bagana mulch (0.00, 2.50, 3.75, 5.00, and 6.25 cm). Effective Operating Cost (EOC), Total Operating Cost (TOC), Gross Revenue (GR), Operating Profit (OP), Profitability Index (PI) and Break-Even Price (BEP) were estimated. According to the indicators analyzed, it was found that this is a promising crop within the different agricultural production schools, with favorable rates for the producer. The variety evaluated presents high resistance as to the water limitation factor, showing positive indicators such as break-even point below the average prices practiced in the region.
Highlights
Resumo - Objetivou-se nesse trabalho avaliar os custos de produção e os índices de lucratividade sob as diferentes lâminas de irrigação na cultura do sorgo para a produção de silagem
The plant water requirement can vary according to the plant development stage along the cycle, being important to know that information for sizing and managing the irrigation projects, and for quantifying the amount of groundwater that shall be replenished in order to meet the crop demand (Freire et al, 2011; Santos Júnior et al, 2014)
It should be noted that the costs associated with water application in irrigation refer to the cost of electrical energy consumed by the motor pump set and water applied along one production year
Summary
Resumo - Objetivou-se nesse trabalho avaliar os custos de produção e os índices de lucratividade sob as diferentes lâminas de irrigação na cultura do sorgo para a produção de silagem. The plant water requirement can vary according to the plant development stage along the cycle, being important to know that information for sizing and managing the irrigation projects, and for quantifying the amount of groundwater that shall be replenished in order to meet the crop demand (Freire et al, 2011; Santos Júnior et al, 2014). In this context, the evaluation of different irrigation depths has been carried out to determine the water requirements of a crop under specific conditions of cultivation, observing the limits imposed by its genetic potential. Investigations carried out by some authors (Geerts; Raes, 2009; Klocke et al, 2010) have pointed out limitations in land and water resources, reason why deficit irrigation strategies have been indicated for regions with low rainfall associated with irregular precipitation distribution
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