The objective of this work was to evaluate the development, yield components and grain yield of different soybean cultivars with and without supplemental irrigation, in the 2018/19 crop, in coxilha soil in Cachoeira do Sul - RS. The experiment was conducted at the UERGS Agronomic Experimental Station. The experimental design was in bands in factorial scheme (3x2), with four replications. The treatments consisted of: factor “A” three soybean cultivars: Nidera 6909 IPRO (NS 6909), Nidera 5909 RG (NA 5909) and Nidera 4823 RR (NS 4823); fFactor “B” two water regimes: irrigated and non-irrigated. Regular rainfall distributions were observed throughout the soybean cycle and volumes totaled 655 mm higher than the cumulative ETc of 413.19 mm. Supplementary irrigation of 134.5 mm was required, which promoted an increase of 18% in IAF, 5.2% in PMG and 7.5% in grain yield, which was 4492.6 kg ha-1 for the water regime. 4158.2 kg ha-1 for the non-irrigated water regime. The cultivars NA 5909 and NS 4823 presented average grain yields of 4659.05 kg ha-1 and the cultivar NS 6909 of 3658.2 kg ha-1

The objective of this study was to analyze the development of diferente soybean cultivars in two sowing dates in Cachoeira do Sul – RS. A field experimente was carried out at UERGS agronomic station, whose soil is classified as Red Argisol. The experimental desing used was in factorial desing (2x3). Factor “A” constitued two sowing dates (11/21/2018; 01/11/2019) and fator “B” constitued three soybean cultivars (NS4823; NA5909; NS6909). Phenological evaluations were performed weekly. Data were organized into 2 subperiods: emergence at full bloom (EM-R1) and full bloom at physiological maturity (R1-R8). In the subperiod EM-R1, the cultivars NS6909 and NA5909 did not present statistical differences among themselves, but differed from the cultivar NS4823, with duration of 49, 48 and 38 days, respectively. In the R1-R8 subperiod, no statistical differences were observed for cultivars NS6909 and NS4823, which differed from cultivar NA5909, with duration of 66, 67 and 71 days, respectively. Late sowing resulted in a shortening of 15 days in the total cycle, which may reflect yield reductions.

Tobacco cultivation, besides being an important source of income for family farming, also translates into one of the most relevant in the state. Thus, the aim of the present study is to analyze the thermal comfort of rural workers during tobacco harvest, through the temperature and humidity index (UTI) calculated with meteorological data from the years 2017/2018 and 2018/2019, in the Vale region. from Rio Pardo. For this, information was first collected anonymously through a questionnaire answered by 80 rural producers from different municipalities in the region and later, a bioclimatic analysis was performed through the calculation and interpretation of the UTI. The results indicated that the tobacco harvest in the region is held from October to January, in the morning (07:00 to 11:00) and afternoon (14:00 to 19:00) shifts. Thermal comfort analysis showed that in the morning there is no heat stress (UTI <74), unlike the afternoon where UTI indicates thermal heat discomfort (from November to January), which is progressive over the period. (UTI increases from 2:00 pm to 6:00 pm) and may be potentiated by the physical stress accumulated throughout the working day.