Physiological and Ecological Studies of Rice Plant in Well-drained and Ill-drained Field. : (9) Changes of phosphate and potassium content in internode of rice plant in ripening process.

摘要

Studies have been carried out intending to clarify content and distribution ratio of phosphate and potassium in internode of rice plant at heading and harvesting time. Results are summarized as follows; 1) In the plants grown under well-drainage condition, translocation of phosphate to ear was promoted. 2) Phosphate and potassium have an opposite charactor to each other in the distribution of them in parts of rice plant, that is, phosphate is very less in top internode and abundant in panicle while potassium is abundant in top internode and less in panicle at the time of maturity. 3) An existence of potassium oxalate within tissue of the top internode was proved by crystallizing it from the extract of top internode of rice plant. 4) It may be concluded from these results that high content of potassium in top internode and high content of phosphate in panicle have positive correlations with photosynthesis, translocation and ripening process resulting in the yield increase.