Abstract
The experiment was conducted to study the relationship between the number and weight of tiller categories in Brachiaria decumbens cv. Basilisk pasture managed under continuous stocking with cattle. The pasture was managed with an average height of about 25 cm. Plants of four different heights (10, 20, 30 and 40 cm) were evaluated by means of the randomized block design with two replications. The number of vegetative tillers, both live and total, reduced linearly according to the plant height. The number of reproductive tillers increased linearly according to pasture plant height (from 8 to 84 tillers m-2 when comparing plants 10 to 40 cm high). Vegetative and reproductive tiller weight increased linearly according to pasture plant height. Vegetative tiller weight (0.316 g average) was lower than the reproductive tiller weight (0.401 g average). A linear and negative relationship was found between the number and weight of the vegetative tillers, whereas a linear and positive one was found for the reproductive tillers. There are fewer vegetative tillers, and a greater number of reproductive and dead tillers in places with tall plants. At the places with high B. decumbens plants, tillers are heavier.
Highlights
The experiment was conducted to study the relationship between the number and weight of tiller categories in Brachiaria decumbens cv
Basilisk pasture managed under continuous stocking with cattle
A linear and negative relationship was found between the number and weight of the vegetative tillers, whereas a linear and positive one was found for the reproductive tillers
Summary
Este trabalho foi conduzido de novembro de 2007 a maio de 2008 numa pastagem de Brachiaria decumbens cv. A adubação fosfatada foi efetuada no dia 16 de janeiro de 2008, com a aplicação de 70 kg ha-1 de P2O5, na forma de superfosfato simples, em toda área experimental. Desde novembro de 2007, os piquetes foram manejados sob lotação contínua com taxa de lotação variável a fim de manter a altura do pasto em cerca de 25 cm. A altura do pasto foi monitorada duas vezes por semana e foram utilizados bovinos machos, em recria, com peso médio de 200 kg. Também foram colhidas duas amostras nos quatro locais do mesmo pasto, sendo uma constituída de 50 perfilhos vegetativos e a outra, de 50 perfilhos reprodutivos. Foram realizadas análises de variância e de regressão em função da altura do pasto, cujo modelo que melhor se ajustou aos dados foi o linear. Todas as análises estatísticas foram realizadas em nível de significância de até 10% de probabilidade
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