Competition and Allelopathy of Rice with Barnyardgrass

One hundred and five rice germplasms from China and other countries, and six Brazilian upland rice materials were identified for allelopathy to barnyardgrass Echinochloa crus galli (L.) Beauv.] by using the relay seeding technique with slight modification. Results showed that Zhangkuang 7, P 4, Kogyoku, IR27316, Milyang 54 and Brazilian upland rice AJ035 had strong allelopathic effect to barnyardgrass. Pot experiment showed that Gumei 2 and Zhong 156 had greater inhibition effect to barnyardgrass compared with CK, on the contrary, allelopathic material TN1 had no significant inhibition effect to barnyardgrass compared to non allelopathic material Xiushui 63. Zhong 156, which had stronger inhibition effect, was related to its plant height, meanwhile, Gumei 2 with stronger inhibition effect to barnyardgrass was due to its own allelopathic trait. The degree of inhibition of barnyardgrass became greater as the increase of rice density. It seemed that the root growth inhibition of barnyardgrass was greater in allelopathic rice than that in non allelopathic rice. TN1 had little allelopathic effect to barnyardgrass collected in the field of China National Rice Research Institute(CNRRI), which might be due to its different inhibition effect to different ecological barnyardgrass. by using the relay seeding technique with slight modification. Results showed that Zhangkuang 7, P 4, Kogyoku, IR27316, Milyang 54 and Brazilian upland rice AJ035 had strong allelopathic effect to barnyardgrass. Pot experiment showed that Gumei 2 and Zhong 156 had greater inhibition effect to barnyardgrass compared with CK, on the contrary, allelopathic material TN1 had no significant inhibition effect to barnyardgrass compared to non allelopathic material Xiushui 63. Zhong 156, which had stronger inhibition effect, was related to its plant height, meanwhile, Gumei 2 with stronger inhibition effect to barnyardgrass was due to its own allelopathic trait. The degree of inhibition of barnyardgrass became greater as the increase of rice density. It seemed that the root growth inhibition of barnyardgrass was greater in allelopathic rice than that in non allelopathic rice. TN1 had little allelopathic effect to barnyardgrass collected in the field of China National Rice Research Institute(CNRRI), which might be due to its different inhibition effect to different ecological barnyardgrass.