Effect of phosphorus in grass Brachiaria humidicola on the milky production of cow's double purpose

In an area of climate tropical dry forest of the State Yaracuy, with franc-sandy soil, pH 5.6 and very low phosphorus content, in paddocks of Brachiaria humidicola, was carried out an experiment in order to measure the effect of the fertilization with phosphorus on the production of dry matter (DM) and the impact on the milky production of cows double purpose. Design experimental factorial, (phosphorus x grazing cycles); 04 phosphorus levels: P0=0 phosphorus or witness, P1=50, P2=100 and P3=200 Kg P205/ha and 04 grazing cycles. The biomass was quantified by means of courts and the milky production through weight of milk to 25 cows during 16 rotations. Was obtained a yield of 2375, 2551, 3416, 2943 kg DM/ha/court and 10.14, 10.21, 10,41, 10.63 l/cow/d for PO, P1, P2, P3 respectively; the variance analysis indicated significant differences (P<0,01) among these values, that which demonstrates the effect of the phosphorus on the production of biomass, being superior the treatment P2, that is to say that 100 Kg/ha P205/ha produces the biggest yield in the grass, Likewise a significant effect was observed (P<0,01) of the phosphorus level on the production of milk with P3 and P2: 200 and 100 Kg P205/ha respectively.