Viabilidade Financeira Da Irrigação Em Sorgo Forrageiro Em Sistema De Aspersão Para Bovinocultura De Corte

Abstract

Palavras chave: Sorghum bicolor L. (Moench), irrigação de pastagem, viabilidade financeira, custos de produção. KIRCHNER, J. H.; ROBAINA, A. D.; PEITER, M. X.; TORRES, R. R.; MEZZOMO, W.; PIMENTA, B. D. ABSTRACTBeef cattle kept in pasture of forage sorghum is characterized as one of the main means of bovine production in Rio Grande do Sul. However, rains are irregulat and producers use irrigation as alternative to the problem. However, there is a need to determine production costs and financial viability of the activity. The objective of this work was to evaluate the financial feasibility of irrigation in forage sorghum for beef cattle for different expectations of average daily weight gain of the animals. Two experiments were conducted in 2015/2016 and 2016/2017 in Santa Maria / RS, and the yields of six conventional irrigation depths (0, 25, 50, 75, 100 and 125% of the ETo) were evaluated, in four replications, and randomized block design. With the productivities, production functions were generated and the possible animal load to be fed for each treatment was determined. Three scenarios were simulated of daily weight gain per animal (0.5, 1 and 1.5 kg-1animal-1day-1), and the production costs for each established water condition, in addition to the financial return for each scenario tested. Financial feasibility has been verified for most of the simulated situations evaluated and costs depend on the precipitation regime.

Economic Viability of Conventional Sprinkler Irrigation in Sudan Grass Production for Beef Cattle

“…The economic viability of conventional sprinkler irrigation for the forage sorghum for beef cattle, at the same time and place of Year 1 and Year 2, Kirchner et al (2019a) observed results that are in agreement with those observed in this study, where the irrigation depth of 100% of ETo was most financially profitable in both years. The net revenue was 23% in Year 1 and 61% in Year 2 higher with the irrigation depth of 100% of ETo in relation to the treatment control, been R$ 4478.96 in Year 1 and R$ 4350.20 in Year 2, considering a liveweight gain of 1.0 kg LW day -1 and the meat price of R$ 6.00 kg -1 (Kirchner et al, 2019a). This net revenue difference between studies is attributed to the higher sudan grass production and to the meat price of R$ 6.50 kg -1 .…”

“…The initial liveweight (LW) used for simulation was 300 kg animal -1 , following the methodology described by Kirchner et al (2019a). This liveweight is considered the average liveweight at the initial weight gain period (Kirchner et al, 2019a). The liveweight gain (LWG) was determined using the following equation:…”

“…Cultivated, natural and native pastures cover, approximately, 162 million hectares in Brazil. Approximately 68% of this total area is under cultivated pastures (ABIEC, 2019;IBGE, 2017), which represents the most viable and practical way for cattle feed (Kirchner et al, 2019a). Among the current options for cultivated pastures, sudan grass (Sorghum sudanense (Piper) Stapf) has been highlighting due to its characteristics, such as high forage production, great leaf-to-stem (L/S) ratios, early sowing possibility, long production cycle, high tillering, rusticity regarding the low soil nutritional conditions and great pasture management flexibility (EMBRAPA, 2014).…”

Water productivity and production function in irrigated millet crop

“…Antoniel et al (2016) reported that FP is remarkably increased in irrigated pastures. Kirchner et al (2019) worked with irrigated sorghum crop in Santa Maria, Rio Grande do Sul, and found that FP increased by 2,600 kg ha -1 at 100% of ETo compared with a control treatment (0% of ETo).…”