Mechanisms by Which Soil Solution Fe<sup>2+</sup> Affects Seedling Growth of Rice Under Rice Straw Return
Jinwang Li | Shiwei Gao | Chao Bao | Shuangshuang Yan | Cheng Ma | Chunmei Ma | Chao Yan
Rice straw return plays an important role in sustainable agricultural development, but the impact of rice straw return on rice growth remains inconclusive. In this experiment, we employed a combination of soil and water cultivation experiments to investigate the impact of rice straw return on seedling growth of rice in Northeast China. This study demonstrated that rice straw return inhibited rice plant growth within 37 days but was no longer significant after 37 days. Rice straw return resulted in an increase in iron(II) (Fe<sup>2+</sup>) concentration of soil solution. The hydroponic test demonstrated that a high concentration of Fe<sup>2+</sup> significantly increased the uptake of Fe, reduced the H<sub>2</sub>O<sub>2</sub> content in root, facilitated the formation of root iron plaque, and inhibited the dry weight at the rice seedling stage, in comparison to a nutrient solution with a normal Fe<sup>2+</sup> concentration. The increased Fe<sup>2+</sup> concentration of soil solution under rice straw return may be a significant factor in the inhibition of rice seedling growth. Moreover, in field management, this study also linked the amount of rice straw returned and soil solution Fe<sup>2+</sup> to provide a clear quantitative guide without affecting plant growth.
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