Portal de Periódicos da CAPES

Abonado del pasto tanner (Brachiaria radicans Napper) con purines: rendimiento de forraje y extracción de nutrimentos

2002; National Institute of Research for Forestry, Agricultural and Livestock; Volume: 40; Issue: 3 Linguagem: Inglês

10.22319/rmcp.v40i3.1296

2448-6698

Rogelio Reyes Guerra Mukul, Pedro Enrique Lara y Lara, José Roberto Sanginés-García,

Invertebrate Taxonomy and Ecology

The objectives of the this study were to determine yield and nutrient uptake in Tanner Grass (Brachiaria radicans) fertilized with pig slurry between September and December 2000. Experimental design was a randomized complete block with four replicates in 5 x 4 m plots and 2 m between plots. Forage was harvested every 21 days at a 5 cm cutting height in 1 m2 plots. Five slurry rates equivalent to 200, 400, 600, 800 and 1000 kg of N ha-1 yr-1, and a chemical fertilizer 240-80-80 as control (in four applications) were evaluated. Yield decreased (P< 0.01) as fall advanced, showing 1285, 738, 723 and 143 kg ha-1 on average, but cumulative yields showed a significant quadratic trend when related to N rates (Y=230.07+7.91x-0.004x2). N concentration in forage, ranged from 13.4 to 25.6 g kg-1 and showed a quadratic response (Y = 11.21+0.031x-0.000021x2). N uptake increased as slurry rates increased from 28.1 to 93.7 kg ha-1 and N recovery was more than 50 %, except for the 1,000 kg N ha-1 yr-1, rate with 34 %. P uptake ranged from 37.6 % for the 1,000N kg ha-1 yr-1 rate to 68.6 % for the 600 Nkg ha-1 yr-1 rate. Potassium uptake was more than 95 %, except for the 1,000 Nkg ha-1 yr-1 rate with 64.6 %. Tanner grass removes large quantities of the elements applied as slurry. However, slurry rates of more than 800 Nkg ha-1 year-1 may cause more N leaching into groundwater.