Thermal time in nitrogen and boron application on irrigated Mombaça grass “Guinea grass”

This study aims to evaluate the correlation among growing degree-days (GDD), canopy height (CH), and leaf area index (LAI) for Guinea grass irrigated, considering different combinations of nitrogen boron rates cycles regrowth. The experiment was carried out from August/2017 August/2018 in a field experiment, climate region is classified as subtropical. A randomized block design arranged factorial scheme (4x3x11) with four replications used. treatment (i) fertilization: 0, 1, 2 kg ha-1; (ii) 250, 500, 750, 1,000 ha-1 distributing 11 growth/cutting cycles. We observed high between GDD parameters evaluated CH LAI. results showed low influence on index, did not these parameters.