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Our hypothesis is that forage sorghum modifies its growth and phyllochron when submitted to different cutting managements. Our objective is to evaluate if different cutting managements modify the growth and phyllochron of forage sorghum. A field experiment subjected the forage sorghum to different cutting managements: uncut, 1 cut, 2 cuts, 3 cuts and 4 cuts. Were evaluated the meteorological conditions during the cycle of the crop, the rates of crop growth, the distribution of the photoassimilates and the phyllochron. The temperature influenced the growth and development of the culture. The photoassimilates were allocated according to the need of the culture, determined by their stage of development. Plants that have not been cut tended, in general, to reduce rates over time, due to the physiological development. While the plants that were cut, had their cycle prolonged, by the regrowth, and some rates were diminished after each cut, by the removal of the vegetal material, as for example, the absolute growth rate, the net assimilation rate, the leaf area ratio and leaf weight ratio. An increase of the phyllochron was observed, with the increase of the number of cuts.

O manejo de cortes modifica o filocrono, o crescimento e a produção do sorgo forrageiro sob ambiente de temperatura amena