AGRONOMIC TRAITS, MORPHOGENETIC AND STRUCTURAL XARAÉS GRASS FERTILIZED WITH DIFFERENT AMOUNTS OF PHOSPHORUS

Abstract

Given the importance of phosphorus to the productivity and sustainability of pasture, the aim of the present experiment was to evaluate forage yield and some yield components of grass Xaraés cultivated in Cerrado soil and fertilized with different phosphorus amounts. The experiment was carried out in a greenhouse of the CCAA/UFMA in Chapadinha Municipality, Region of Lower Parnaíba. The species used was Brachiaria brizantha. Xaraés cultivated in the period from July to November 2011. Using four amounts of P, firstnamely: 0, 50, 70 and 90 kg/ha P2O5, corresponding to the control, low, medium and high technological level. The analysis of variance revealed for the total production of herbage dry matter, leaf dry mass, dry mass of stems, whose highest values were observed at doses of 70 and 90 kg/ha P2O5. The P acted positively on morphogenetic and structural grass Xaraés. However, had no effect on tillering, leaf/stem ratio, production of root dry weight ratio and the aera/root, LAR and LSR.