Abstract

This paper studied hot pepper growth promotion and inhibition of fusarium wilt with rice stalks, corn stalks, soybean stalks and hot pepper stalks (control). The results of this study showed that extracts of corn stalks, soybean and hot pepper stalks (CK) had a positive effect at a concentration of 0.01 g L^-1 but had an inhibition at a concentration of 0.04 g L^-1. Different from 0.01 g L^-1, all extracts of the crop stalks had inhibitory actions on mycelia growth of Fusarium oxysporum at a concentration of 0.04 g L^-1. As the concentration of rice stalks extract increased, the inhibiting effects of F. oxysporum growth became obvious. At the concentration of 0.04 g L^-1 extracts of rice stalks, corn stalks, soybean stalks and hot pepper stalks (CK) all inhibited the germination of F. oxysporum spore. The growth and physiological indices of hot pepper, such as plant height, stem diameter, fresh weight and root vigor, were promoted by decomposed crop stalks (DCS), besides there was a positive correlation between the effects and the amount of DCS addition. The physiological parameters of hot pepper, such as superoxide dismutase (SOD) activity, malonaldehyde (MDA) content and conductivity of relative specific, decreased obviously after the treatments with DCS were given.

Key words: Crop stalks, hot pepper, Fusarium oxysporum, allelopathy.