Tillering dynamics of Tanzania guinea grass under nitrogen levels and plant densities

this study evaluated the influence of nitrogen levels (n) and plant density (d) on the tillering dynamics of tanzania guinea grass (panicum maximum jacq.). treatments were arranged in a completely randomized block design with 12 treatments and two replicates in a factorial scheme (4 × 3) with four levels of n (0, 80, 160 or 320 kg ha-1 n) and three plant densities (9, 25, and 49 plant m-2). higher number of tillers was observed in the treatment with 9 plants m-2 and under higher levels of n, especially in the second and third generations. still, the n influenced quadratically the appearance rate of basal and total tillers, which were also affected by plant density and interaction n × d. however, the appearance rate of aerial tiller was not influenced by factors evaluated. the mortality rate of total tiller was influenced quadratically by the nitrogen levels and plant densities. the mortality rate of basal tiller responded quadratically to plant density, whereas the mortality rate of aerial tiller increased linearly with fertilization. pastures with low or intermediate densities fertilized with nitrogen, presented a more intense pattern of tiller renewal.