The experiment was carried out from December/2002to April/2003 and aimed to evaluate the effects of two phosphorus sources (ordinarysuperphosphate + triple superphosphate and Yoorinâ magnesium thermophosphate),as a function of days (24) and evaluation period (summer and autumn) on leafappearance interval (LAPI), leaf elongation rate (LER), leaf senescence (TLS),first and last ligule height (FLH; LLH), number of expanded leaves (NEL), numberof leaves in expansion (NLE), total number of leaves (TNL), total number oflive leaves (TNLL), and grazing return rate (GRR) on mombaçagrass (Panicummaximum Jacq. cv. Mombaça). The experimental design was randomizedblocks with three replications. There was no difference between phosphorus sourcesin all evaluated variables, except for leaf elongation rate, which was higherin tillers fertilized with the SPS+TSP treatment. Differences were found betweenevaluation periods, with summer showing higher leaf elongation rate and liguleheight (first and last). The days evaluated indicated effect on first liguleheight (FLH; LLH), number of expanded leaves (NEL), number of leaves in expansion(NFE), total number of leaves (TNL), total number of live leaves (TNLL), totalnumber of senescent leaves (TLS), and grazing return rate (GRR). For days andperiod interactions only TNLL and TSL had positive linear correlations.
