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The maximization of vegetable productivity indices is sought in any cultivation, including of Pennisetum purpureum, however, this depends on the nutritional status of the plants, in this aspect the nitrogen exerts essential function. The objective of the research was to evaluate the ecophysiological aspects and forage yield of purple elephantgrass as a function of nitrogen fertilization. The experiment was accomplished at the Experimental Station of Alagoinha, belonging to the State Agricultural Research Company of Paraiba, located in the municipality of Alagoinha, state of Paraiba, Brazil; A randomized block design was used with five treatments and four repetitions. The treatments consisted of the application of 0, 20, 40, 60 and 80 kg of N ha-1. The variables evaluated were: chlorophyll a, b and total index, liquid photosynthesis, internal carbon concentration, instantaneous carboxylation efficiency, rain use efficiency, cultural water footprint, nitrogen use efficiency, productivity of green and dry matter and carrying capacity for dairy cows. The increase of N doses positively stimulates the indexes of chlorophyll, gas exchange, rain use efficiency, cultural water footprint, productivity and animals carrying capacity of the purple elephant grass, however, reduces the efficiency of use of N.

Ecofisiologia e rendimento forrageiro do capim elefante roxo em função de adubação nitrogenada