Nutrients exportation by Tifdwarf bermudagrass from golf course greens

Abstract One of the management techniques used in greens (final areas of the holes) of golf course is the fertilizer. To correct fertilization program of these areas should know the consumption of nutrients throughout the plant cycle. The objective was to determine the export of nutrients by clipping of Tifdwarf bermudagrass (Cynodon dactylon (L.) Pers. x Cynodon transvaalensis Burtt-Davey) used in golf courses greens in the four weather seasons, as information to improve nutritional management. The research project was conducted in two golf courses in Sao Paulo State. Four greens were studied in each field, for a period of one year, using a 4x2 factorial (weather seasons x golf courses) in a completely randomized design. The production of dry matter and nutrient concentration were evaluated, and the absorption and exportation of nutrients by leaf clippings was subsequently calculated. The amount of nutrients exported by turfgrass clippings was different between the two golf courses. The summer was the season of greatest accumulation and export of nutrients in FG, except for Fe. Autumn was the season of greatest accumulation and export of nutrients in FCA, except for Mn and Zn. Considering the amount of nutrients exported by the greens clippings of the Tifdwarf bermudagrass from the two golf courses studied, the macronutrients were exported in the following order: N>K>Ca>P>S>Mg (21.8, 4.3, 2.0, 1.9, 1.8, 0.7 g m-2) and the micronutrients were exported in the following order: Fe>Zn>Mn>Cu>B (257.8, 27.4, 23.6, 7.8, 6.0 mg m-2). Resumo Uma das técnicas de manejo utilizada nos greens (áreas finais dos buracos) de campo de golfe é a adubação. Para correto programa de adubação destas áreas deve-se conhecer o consumo de nutrientes ao longo do ciclo da planta. Objetivou-se determinar a exportação de nutrientes pelas aparas de grama bermuda Tifdwarf (Cynodon dactylon (L.) Pers. x Cynodon transvaalensis Burtt-Davey) utilizada em greens de campo de golfe, nas quatro estações climáticas, como informação para melhorar o manejo nutricional realizado. O experimento foi realizado em dois campos de golfe no estado de São Paulo. Foram estudados quatro greens em cada campo, pelo período de um ano, sendo adotado um fatorial 4x2 (estações climáticas x campos de golfe) em delineamento inteiramente casualizado. Foram avaliadas a produção de massa seca foliar e a concentração de nutrientes, calculando-se posteriormente a absorção e exportação de nutrientes pelas aparas das folhas