Acumulación de biomasa, nitrógeno y fósforo en un pastizal natural fertilizado del norte de la Pampa Deprimida

RUBIO G., M.A. TABOADA, R. S. LAVADO, H. RIMSKI-KORSAKOV, M.S. ZUBILLAGA

Ciencia del Suelo

ASOCIACIÓN ARGENTINA DE LA CIENCIA DEL SUELO

Año: 1997 vol. 15 p. 48 - 50

0326-3169

<!-- /* Font Definitions */ @font-face {font-family:"Lucida Sans Typewriter"; panose-1:2 11 5 9 3 5 4 3 2 4; mso-font-alt:"Lucida Sans Typewriter"; mso-font-charset:0; mso-generic-font-family:modern; mso-font-pitch:fixed; mso-font-signature:3 0 0 0 1 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:none; mso-layout-grid-align:none; text-autospace:none; font-size:10.0pt; font-family:"Lucida Sans Typewriter"; mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:"Lucida Sans Typewriter";} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> A field study was conducted to determine the influence of nutrients addition on biomass and nutrient accumulation of a grassland community. The study lasted 18 months and was located at Chascomús (Prov. Buenos Aires, Argentina) and a factorial design (nitrogen x phosphorus) was used. Labile fractions of soil phosphorus were also measured. Biomass production showed a marked seasonality, minimum in winter, which did not change with fertilization. Significant increases in dry matter accumulation due to fertilization were observed in two measurement dates. Phosphorus addition overcompensated the phosphorus lost in removed dry matter and removed nitrogen were greatest than nitrogen inputs (in all treatments). Fertilization had little influence on nutrient composition of herbage and on fractionation of labile phosphorus