Avaliação de diferentes lâminas de água e de doses de nitrogênio na produção de matéria seca e composição bromatológica do capim Mombaça
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2003-02-27
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Universidade Federal de Goiás
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The best combinations of different sheets of water were evaluated and of doses of nitrogen in the production of dry matter (t/ha) in grass Panicum maximum Jaqc. cv. Mombaça. The grass was submitted to the following treatments: 5 irrigation sheets (portions L0, L1, L2, L3 and L4 corresponding her/it respectively without irrigation, 30%, 60%, 90% and 120% of the evaporation and potential perspiration of the culture (Etpc)), applied for leak, and to 4 doses of manuring of nitrogen (subportions 100, 200, 300 and 400 kg/ha/year of nitrogen) that were divided in 7 applied doses after the cuts. The period of used rest was of 28 days, being approximately the mass cut grass the 30 cm of the soil. The used complet randomized blocks in portions subdivided appraised in 6 different times understanding the period of the drought in the area. For the production of dry matter (t/ha) there was difference (P <0,05), in the irrigation in the months of April, May, June and October, not having difference (P>0,05) the months of July, August and September, due to fall in the production caused by the low temperatures. The matter accumulation dries in the months of deficit hidric for L3 and fertilized with 400 kg/ha/year of N was of 1,36 t/ha, corresponding her/it an increment of production of approximately 152% in relationship the portions without irrigation (0,54 t/ha). there was not significant difference (P>0,05) for the doses of manuring of nitrogen. The low temperatures and the irrigation handling interfered in the production of dry matter, could limit the use of this technique in certain areas. The use of the leak system in the pasture irrigation is not very defined having been had difficulties in the evaluation of the correct application of water.
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RUGGIERO, Juliana Azevedo. Evaluation of different water depths and nitrogen levels on dry matter production and chemical composition of grass Mombasa. 2003. 72 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2003.