In order to explore the effects of the combination of rice ridge cultivation and rice fish chicken symbiotic mode on rice stem lodging, ear traits, and yield, this study conducted field comparative experiments on conventional rice ridge cultivation (CK), rice ridge fish farming (RF), rice ridge chicken farming (RC), and rice ridge chicken fish farming (RFC) to study the changes in rice stem lodging, ear traits, and actual yield under the rice fish chicken symbiotic mode. The results showed that there was no significant overall difference in the mean values of rice plant height, fresh weight, center of gravity height, and internode length among the four treatments over the course of two years. Compared with CK treatment, RFC and RC treatment showed an increasing trend in the internode outer diameter, internode wall thickness, spike length, and fresh weight of rice stems, but there was no significant difference in the overall mean; The rice yield has also remained stable. The outer diameter, wall thickness, panicle length, and fresh weight of rice stem internodes under RF treatment showed a decreasing trend, and the fresh weight of panicles significantly decreased in 2019 (P<0.05); The average decrease in rice yield over the past two years was 29.98% (P<0.05), and there was no significant difference in the other mean values as a whole. Over the course of 2 years, the average increase in internode stem bending resistance of rice treated with RFC and RC compared to CK was 19.69% and 8.10%, and the 4th and 5th internode stem bending resistance of RFC significantly increased (P<0.05); However, the bending section modulus and bending strength of the stems treated with RF showed a decreasing trend overall, but the overall change in mean was not significant. Compared with CK treatment, RFC and RC treatments reduced the average maximum stress between rice stem nodes by 17.85% and 15.08%, while the average lodging index decreased by 4.35% and 4.26%, but did not reach a significant level; The lodging index of stem internodes under RF treatment increased by an average of 11.47%, and significant differences were observed between the 3rd and 2nd to 5th internodes in 2018 and 2019 (P<0.05). In summary, the ridge farming rice fish chicken symbiosis and ridge farming rice chicken symbiosis models can improve the length and fresh weight of rice panicles, stabilize rice yield, increase the outer diameter and wall thickness of rice stem internodes, improve stem bending resistance and bending section modulus, reduce the maximum stress and lodging index of the stem, and thus have a certain stem strengthening effect and lodging resistance.
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