Abstract
The objective of this work was to evaluate the tiller population density in Urochroa decumbens pasture deferred for 95 and 140 days, aiming to determine the best strategy for nitrogen fertilization. Four fertilization strategies at the beginning and end of summer (0-0, 100-0, 50-50, 0-100 kg ha -1 of N) were studied, respectively, with four repetitions. For the pastures deferred for 95 days, the population densities of vegetative tillers were greater (p < 0.05) for the strategy 0-100. At the end of the deferment period, the weight of the vegetative tillers per hectare was greater for the strategy 0-100, followed by the strategy 50-50. The densities of vegetative tillers, evaluated in the pastures deferred for 140 days, were greater (p < 0.05) for the fertilization strategies 0-100 and divided 50-50. At the end of the deferment period, greater density (p < 0.05) of dead tillers was verified for the fertilization strategy 0-100, not proving effect (p < 0.05) in post-grazing. The strategy of application of 100 kg ha -1 at the end of summer, followed by the strategy of 50 kg ha -1 of nitrogen divided between the beginning and end of summer, promoted a positive influence on the tiller population density in pastures deferred for 140 days.
Highlights
An aggregation of different tillers organized by growth origin, age, stage of development and hierarchy constitutes the plants of a pasture
Santos et al (2009a), characterizing tillers in deferred U. decumbens pastures fertilized with nitrogen, reported a change in the number of vegetative tillers with fertilization on the pastures deferred for 116 days, concluding that the stimulation from the nitrogen fertilization was compensated by the long duration of the deferment period of the pasture
In the pastures deferred for 73 days there was an increase of 145% in the vegetative tiller density, with the increase of the nitrogen dose from 0 to 129 kg ha-1
Summary
An aggregation of different tillers organized by growth origin, age, stage of development and hierarchy constitutes the plants of a pasture. The formation of new tillers assists the establishment and the perenniality of forage gramineae, assisting in the protection of the soil, weed control, and principally increasing the production of forage. The characterization of individual tillers in pastures permits the discernment of the effects of. Animal Sciences the management actions utilized in the pastures, and recommendation of those that are most efficient. There are few studies that involve tiller population density. In this sense, these studies could help to understand and determine alternatives for pasture management that do not compromise pasture persistence, and favor the optimization of production processes and utilization of forage produced
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