Effect of aqueous extract and released toxic of wheat residues on rice

Abstract

Several experments were conducted to determine whether the reduction in growth of rice grown after wheat in crop rotation was due to toxicity of wheat .
The result can be summarized by the following points:
1. Aqueous extracts of wheat significantly reduced seed germination and seedling growth of rice .
2. The toxicity of the residues appeared two weeks after residues decomposition in soil and continue for six weeks . these result strongly suggest the toxicity effect of wheat causative factor resbonsible for the raduction of rice growth .