Torres Justiniano, Salvio

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Physiological response of sugarcane (Saccharum spontaneum, cv US 67-22-2) to nitrogen levels
(2005) Torres Justiniano, Salvio; de la Torre, Winston; College of Agricultural Sciences; Pérez Alegría, Luis R.; Olmeda, Rafael F.; Department of General Programs in Agricultural Sciences; Salas Quintana, Salvador
This experiment quantified the agronomical and physiological response of environmental cane US 67-22-2 to N fertilization levels, and developed mathematical relationships between dependent traits and independent climatological parameters. A preliminary greenhouse experiment, was the foundation for the design of a field experiment conducted on a Vertisol soil at Puerto Rico, in which the sugarcane response to four N levels (0, 448, 896, 1344 Kg N/ha) and three harvest intervals (HI) (240, 270, 300 days after planting) was studied. At the greenhouse experiment and in terms of leaf area, plant height and number of leaves, the plants with N were significantly superior to the control, and statistically similar among them. At the field experiment it was observed that the application of 448 Kg N/ha is enough to obtain adequate plant cane yield, photosynthetic rate and relative chlorophyll content. The optimum dry matter yield (25,811 Kg/ha) was obtained at 300 days HI.