Allelopathic effects of root exudates of <I>Amaranthus cruentus</I> L. on seed of <I>Glycine max</I> (L.) Merril, <I>Zea mays</I> L. and <I>Bidens pilosa</I> L.

Abstract

Allelopathic effects of root exudates of Amaranthus cruentusL. on seed of Glycine max (L.) Merril, Zea mays L. and Bidens pilosa L.) The Amaranthus cruentus L. specie has great nutritional value because of its high protein content, and contain important minerals for alimentation. Consequently, the cultive of this cereal is extremely important, the consortium system is a way to guarantee the introduction of this species in the region cultivation. The objective was to know the allelopathic effects in consortium simulation of amaranth-soybean and amaranth-corn, besides the interaction between the invader beggarticks and the amaranth. For the exudate preparation, 50 amaranth seeds were germinated under moistened filter paper with 5mL of destilated water in Petri dishes, that were stored in germination chambers at 25ºC, with photoperiod of 12 hours of light. After five days, the seedings were removed and the same substrate was used to germinate the species studied. Also, the contrary was made, in which the germinated seeds of the agricultural species gave place to the amaranth seeds. The experimental design was entirely casualized, and the data was submitted to variance analysis and the means compared by the Tukey test (p<0,05). None of the agricultural species showed sensitive to the amaranth effects, in the same conditions however, the beggarticks raised increased the length of the shoot. Only the corn exudate offers negative effects on the amaranth initial development. Therefore those consortium simulations must be field analyzed to prove such effects.