Pedosphere 4(4): 307--310, 1994
ISSN 1002-0160/CN 32-1315/P
©1994 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Combined application of Si and Mn for correcting Fe toxicity to rice (Oryza sativa L.) on a red earth |
| LIAO Zong-Wen, LIN Dong-Jiao, WANG Wei-Hong, LIN Dong-Jiao and WEN Zhi-Ping |
| Soil Science Department , South China Agricultural University, Guangzhou 510642 (China) |
| ABSTRACT |
| Based on the fact that Fe toxicity which is usually characterized by leaf oranging and low yield can be obviously subdued by application of Si or Mn due to counteraction between Fe and Si or Mn. A pot experiment was conducted with four treatments of CK, Si, Mn and Si+Mn to further study the effect of combined application of Si and Mn on rice growth on red earths. Water-soluble Si, Fe and Mn were measured, and electron probe was used to study Si, Mn, Fe and Ca in root cross sections. Combined application of Si and Mn could increase water-soluble Si and Mn but reduce water-soluble Fe, thus being favorable for correcting Fe toxicity. Electron probe study showed obvious differences of Si, Fe, Mn and Ca in rice roots between CK and the other three treatments. The combined application of Si and Mn could reduce leaf oranging and improve rice growth. The Si+Mn treatment had a higher plant height, lower number of oranging leaves and a 25.0% higher rice yield than CK and showed a better effect on rice growth than the treatment of sole Si or Mn. |
| Key Words: Fe, Mn, red earth, rice (Oryza sativa L.), Si |
| Citation: Liao, Z. W., Lin, D. J., Wang, W. H., Jiang, D. R. and Wen, Z. P. 1994. Combined application of Si and Mn for correcting Fe toxicity to rice (Oryza sativa L.) on a red earth. Pedosphere. 4(4): 307-310. |
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