Resposta do capim sudão irrigado na região fronteira oeste do Rio Grande do Sul

Abstract

Water is one of the main factors limiting the production of fodder, followed by temperature. Irrigation is an important ally in regions where irregular precipitation occurs, as is the case of the region of Alegrete, RS. However, in order for irrigation to be satisfactory, it must be well quantified, since insufficient slides only moisten the upper soil layer and the excess causes problems for both the crop and the environment. The objective of this study was to determine the crop coefficients and the water balance of the Sudan grass crop, as well as to evaluate the productivity of the crop with and without irrigation in the city of Alegrete, RS. The work was developed in the experimental area of the IFFar - Alegrete Campus, corresponding to 288m² (treatment with irrigation) and 36m² (treatment without irrigation), and the irrigated area was divided into nine 4x8m (32m²) plots with a drainage lysimeter installed in each parcel. For irrigation, a conventional sprinkler system was used in the in-line field. During the crop cycle, two cuts were performed to obtain productivity, one at 30 DAS and another at 50 DAS. The results were submitted to analysis of variance by Test F at the 5% probability level. The means were compared by the Tukey test at 5% probability, using Sisvar 5.3 software. The coefficients of the culture were obtained by the relation between ETc and Eto, where at the end of the cycle the following coefficients of the culture 0.502, 0.928, 1.034, 0.732 for phases 1, 2, 3 and 4 respectively were obtained.