Melegari de Souza

Effect of nitrogen fertilization and cutting age on yield of tropical forage plants

This work aimed to assess the yield of five forage species subjected to nitrogen (N) levels at three different cutting ages. The experiment was carried out in the city of Santa Tereza do Oeste, at IAPAR’s (Agronomic Institute of Parana) experimental field, by applying a randomized complete block design in a factorial scheme 5×4×3, with five species: common black oat (Avena strigosa Schreb cv. Common), IPR 61 oat (Avena strigosa Schreb cv. IPR 61), Triticale Tpolo 981(Xtriticosecale wittmack), IPR 126 White oat (Avena sativa cv. IPR 126) and ryegrass (Lolium multiflorum Lam.); N levels were (0, 30, 60 and 120 kg ha -1 ); cutting ages were 66, 95 and 116 days after emergence (DAE), with three replications. -1 by cut and total. The common black oat proved to be different from the other forage plants in DM yield, accumulating less quantities of it due to its cycle. The application of nitrogen fertilization to the coverage linearly influenced the ryegrass at 66 DAE and all other species at 116 DAE in a positive manner. Nitrogen did not influence the total accumulation of dry matter of both common black oat and Triticale Tpolo 981.

Nitrogen and sulfur applied to the coverage of a canola crop in no-tillage system

Canola (Brassica napus L. var. oleifera) is an oilseed that belongs to the Brassicaceae family and has in its grains a content of 38% oil and 27% protein. The aim of this work was to evaluate the interference of different quantities of nitrogen fertilizer applied to the coverage of the Canola crop on direct and indirect components of the production of grains and oil. In that sense, an experiment with the Canola culture was implemented, in succession to the culture of soybean, with hybrid Hyola 61, under no-tillage system, in a soil classified as Eutrophic Red Latosol, located at 24°49’06” S and 53°16’44” W, in the experimental area of Andreis Agricultural Farm, in the municipality of Corbélia, Paraná State – Brazil. The experimental design used consisted of random blocks with 4 replications and 7 treatments, summing up to 28 plots, in an area of 882 m2. For base fertilization, 28 kg ha -1 of N, 50 kg ha -1 of P2O5, and 50 kg ha -1 of K2O were applied. Treatments consisted of control, 25 kg ha -1 of N, 50 kg ha -1 of N, 75 kg ha -1 of N, 25 kg ha -1 of N + 27 kg ha -1 of S, 50 kg ha -1 of N2 + 54 kg ha -1 of S and 0.45 L ha -1 of N + 0.1 L ha -1 of S (foliar fertilizer Micro Xisto HF), applied to the coverage 42 days after the emergence of Canola seedlings. No significant statistical differences were observed among treatments on production components, except for oil content.