2024-03-29T14:28:55Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/454202017-02-28T13:38:45Zcom_10261_129com_10261_6col_10261_382
00925njm 22002777a 4500
dc
González-Andújar, José Luis
author
Fernández-Quintanilla, César
author
2004
A mathematical model for simulating the population dynamics of annual ryegrass (Lolium rigidum) has been constructed using
previous reported data. The model is used to describe the bahaviour of the population in the absence of control practices and to
predict the effect of various control strategies. In the absence of control and under continuous winter barley cropping the population
grewsigmodally, reaching an equilibrium at a density of 2357 seeds m 2 (1508 seedlings m 2). Annual application of herbicides at
100%, 50% and 25% the standard rate resulted in reductions in the equilibrium position of the population of 90%, 80% and 70%,
respectively. Using various types of cultural control tactics (delayed seeding, crop competition, seed catching, crop rotation) resulted
in partial control of this weed, maintaining relatively high population levels. Keeping the prevailing crop rotation (continuous
barley) and integrating the use of various chemical and cultural tactics resulted in the best long-term results with a seed bank
equilibrium level of 77 seeds m 2 (49 seedlings m 2). Results from the sensitivity analysis indicate that the size of ryegrass
populations is particularly vulnerable to small changes in the reproductive capacity and the loss of seeds. These two processes should
be studied with greater detail in order to provide possible clues for the control of this weed. Furthermore, control tactics specifically
focused on those life cycle periods should be investigated.
Crop Protection 23: 723-729 (2004)
0261-2194
http://hdl.handle.net/10261/45420
10.1016/j.cropro.2003.12.007
Simulation
Non-chemical control
Herbicide
Density-dependence
Ryegrass
Modelling the population dynamics of annual ryegrass (Lolium rigidum) under various weed management systems