Some positive evidence also exists for the minimum critical distance effect for tropical trees . In most of the cases involving seedling mortality , however , alternative causal factors such as intracohort competition or allelopathy ...

Strong reactions of the E. deglupta roots to grass competition were rare and apparently limited to the ... The two principal possibilities are competition for water and / or nutrients and chemical interactions ( allelopathy ) .

Advances in the study of VA mycorrhizas . Ann . Rev. Phytopath . 11 : 171-196 . ... B. S. thesis , The University of Panamá . RICE , L. E. 1979. Allelopathy-- an update . ... On competition . Versl . Landbouwk . Onderz . 66 : 1-82 .

1.5 Effects of weed infestation in food crops Competition for ( i ) light b . C. d . e . Vegetative propagules allow for vigorous and faster establishment of weed species Allelopathy f . g . i . ( ii ) ( iii ) moisture nutrients Weeds ...