Chinese Journal OF Rice Science >
Effects of Straw Return Rate on Soil Reducing Substances and Rice Growth Under Different Soil Conditions
Received date: 2023-04-17
Revised date: 2023-06-07
Online published: 2024-03-14
【Objective】The study investigates the formation of reductive substances following rice straw incorporation and its impact on rice growth across different soil types.【Method】A two-year pot experiment simulated full straw incorporation at low (RL), medium (RM), and high (RH) rates on sandy loam (S1) and silty loam (S2) soils, with no straw incorporation (R0) as the control. Total soil reducing substances, Eh, ferrous ions, manganese ions, and ammonium nitrogen contents were measured, alongside analyses of rice tillering, root dry weight, root vigor, and rice yield.【Results】Soil Eh decreased significantly, and the concentrations of reducing substances increased after straw incorporation, with S2 exhibiting higher levels than S1. Compared to the control, straw incorporation up to 56 days after transplanting in 2021 increased the levels of total reducing substances, Fe, and Mn by 8.36%−199.64%, 1.43%−160.03%, and 8.43%− 57.68%, respectively. Similar increases occurred before 45 days after transplanting in 2022, ranging from 2.95% to 163.61%, 0.77% to 19.74%, and 3.28% to 64.96%. There was a positive correlation between straw incorporation and the levels of total reducing substances, Fe, and Mn. Straw incorporation significantly elevated soil ammonium N content by 11.28%−50.67% and 10.79%−351.53% before 56 days (2021) and 35 days (2022) after transplanting, respectively. Root dry weight at the tillering and jointing stages decreased by 15.06%−45.80% due to straw incorporation. In S1 soil, RL and RM increased root vigor at the jointing stage, while RH decreased root vigor on S2 soil. The number of rice tillers and dry matter accumulation decreased by 7.23%−48.44% and 3.59%−43.57%, respectively, during the rice reproductive period after straw incorporation. Rice yield was not significantly affected in the second year of RL and RM treatments, whereas RH treatment significantly reduced yield in both years. S1 exhibited higher oxidation-reduction potential than S2, with S2 displaying higher levels of reducing substances, manganese ions, ammonium nitrogen, root dry weight, root activity, tiller number, dry matter accumulation, and yield.【Conclusion】Straw incorporation increases the early-stage content of reducing substances and inhibits rice growth in cold areas. The impact of straw return on rice yield varies with soil type, with significant yield reductions observed on sticky soil following straw incorporation. Medium straw incorporation does not significantly affect the number of tillers but promotes the formation of larger panicle without reducing yield significantly. Optimizing straw incorporation technology requires effective measures to mitigate the negative effects of reducing substances.
Key words： straw returning; cold area; rice; reducing substances; yield
PENG Xianlong, DONG Qiang, ZHANG Chen, LI Pengfei, LI Bolin, LIU Zhilei, YU Cailian . Effects of Straw Return Rate on Soil Reducing Substances and Rice Growth Under Different Soil Conditions[J]. Chinese Journal OF Rice Science, 2024 , 38(2) : 198 -210 . DOI: 10.16819/j.1001-7216.2024.230404
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