Arthur C. Sanches

Produtividade da canola sob irrigação e doses de adubação nitrogenada

The study was conducted in the May-September 2012 at the Universidade Federal da Grande Dourados, with the main to evaluate the productivity, morphological and productive components of canola (Hybrid Hyola 61) crop under different levels of nitrogen (topdressing) and irrigation. The experimental design was randomized blocks in a split-plot with four replications. The plots were irrigated and no irrigated. The subplots were three treatments with nitrogen (topdressing) doses of 30, 60 and 90 kg ha-1. With the use of irrigation crop attained better results in plant height, shoot dry mass and number of siliqua per plants. The oil content and thousand grain weights showed significant increases as a function of irrigation and nitrogen doses. The yield under irrigation was higher than non-irrigated, with values equal to 3145.65 and 1354.45 kg ha-1, respectively.

Application of swine wastewater for irrigation of Tifton 85 grass: Part I-productivity and nutritional quality

The use of swine wastewater (SW) for irrigation can be an excellent alternative to increase productivity and quality of pastures. This work was carried out from October 2013 to September 2014 in Dourados – MS. The objectives were evaluation of the productivity and nutritional quality of Tifton 85 grass (Cynodon spp.) under different doses of SW in the presence and absence of normal water irrigation. The experiment was set in a randomized block with split plots design, including water irrigated and non-irrigated in the main plots and four doses of SW in the subplots (75, 150, 225 and 300 m 3 ha -1 cut -1 ), with four replicates. The total forage yield and the bromatological value (crude protein, neutral and fibre detergent acid and dry matter digestibility) were evaluated. There was a significant effect of irrigation and SW doses on total dry matter yield, reaching 41.4 Mg ha -1 year -1 using the highest dose of SW (300 m 3 ha -1 ) and irrigation use. Irrigation also provided higher crude protein levels, increasing with linear adjustment to SW doses, reaching 17.9% in the annual average. The neutral detergent fibre and the acid detergent fibre presented lower results under irrigation, reaching 65.4 and 32.6% in the annual average, respectively, and linearly decreased using SW doses. Inverse behavior was observed in the in vitro digestibility of dry matter, which was higher under irrigation, reaching 69.5% in the annual average and presenting linear growth according to doses of SW.

Canola yield under different irrigation frequencies and nitrogen levels in the Brazilian Cerrado

ABSTRACT In the Brazilian Cerrado, canola is grown in the off-season. During this period, rainfall is insufficient to ensure the maximum crop yield, and irrigation is needed. Canola has a high demand for nitrogen; thus, the application of this nutrient is essential for obtaining a good crop yield. Therefore, a study was conducted at the Federal University of Grande Dourados in 2012 and 2013 using a randomized block split-plot design with four repetition treatments in the plot that consisted of three irrigation frequencies (no irrigation, weekly irrigation and irrigation three times per week). Subplots received different doses of nitrogen: 0, 30, 60, 90 and 120 kg ha - 1 in 2012 and 0, 60, 120, 180 and 240 kg ha -1 in 2013. In both periods, the irrigation frequencies significantly affected plant height, dry weight, grain yield, thousand grain weight and oil content. The nitrogen levels significantly affected dry weight, thousand grain weight and oil content in 2012, as well as plant height, number of pods, dry weight, grain yield and oil yield in 2013. The highest yields were obtained when irrigation was performed three times per week, corresponding to 3,001.84 kg ha

Productivity and nutritional quality of Urochloa brizantha cv. BRS Piatã grass fertirrigated with swine wastewater in different seasons of the year

The Brazilian swine production has been grown 38.9% in the last decade. Inherent to the process, the pollution potential has increased which brings environmental concerns, especially about the final disposal of swine wastewater (SW). In this context, this work aimed to evaluate the responses of ‘Piatã’ grass (Urochloa brizantha, cv. BRS ‘Piatã’) to the fertilization with SW, with and without supplemental irrigation. The experiment was carried out for one year from March 2014 to March 2015. The experiment was conducted in a split-plot with a random blocks experimental design with four replications. The treatments in the plots were referred to the use of irrigation (with and without), and in the subplots to the SW doses (four doses: 75, 150, 225 and 300 m ha). In the irrigated treatment, the irrigation was fulfilled to re-establish soil moisture in the field capacity (Өfc). The parameters used to verify the treatments were: total forage yield (TFY), leaves and stems yield (LSY), crude protein rate (CP), neutral detergent fibre (NDF), acid detergent fibre (ADF) and in vitro dry matter digestibility (DivDM). There was a significant increasing effect for doses, reaching a mean TFY of 41.92 Mg ha at the dose of 300 m ha. The combination of the highest dose of SW combined with supplemental irrigation produced the best results of TFY and LSY with (47.8 and 41.9 Mg ha year, respectively). Irrigation also led to the best results per cycle, with the highest forage accumulation in spring, 12.28 and 8.55 Mg ha for irrigated and non-irrigated treatments, respectively. In the bromatological parameters, supplemental irrigation led to the highest average levels of CP, ADF and DivDM of 16.7%, 33.8% and 66.5%, respectively. The NDF did not respond to irrigation and SW doses. The research allowed concluding that irrigation and SW fertigation brought quantitative and qualitative benefits to ‘Piatã’ grass production.