Tree species composition in tropical forest remnants of. Principles and recommended methods are presented for the establishment of the vegetation cover in degraded areas by natural and antropic effects. Crop marks appear due to the principle of differential growth. Siega quimica siega mecanica malas hierbas pastoreo suelo cubierto flora espontanea picada e incorporada mediante una labor cubierta vegetal viva planta cultivada con siega quimica crecimiento controlado siega mecanica.
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