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35
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Title |
The Studies on Recycling and Circulation Utilizing Phosphorus Accumulated in the Dark-Red Soil of Miyako Island¶ |
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Authors |
Kazuhiro MAESATO, Yoshinobu KAWAMITSU, Yoshihisa SHIMIZU, Saburo MATSUI |
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Office name |
Okinawa Prefectural Miyako Agriculture and Forestry High School, University of the Ryukyus,¡¡ Kyoto University, Kyoto Universit |
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Key Words |
dark-red soil, field test , accumulated phosphorus , recycle, groundwater¡¤ Miyako Island |
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Abstract |
A field test was conducted to explore the possibility of recycling accumulated phosphorus in the soil of Miyako Island in Okinawa Prefecture. The yield of eggplants and green peppers, with their natural absorption of phosphorus, was enlarged when strain22 with bagasse/bagasse charcoal was applied to experimental fields. Phosphorus was applied at a standard concentration and 1/10 of the concentration to the fields where sugarcane had been grown continuously. As a result, we found that with the application of strain22 with bagasse/bagasse charcoal, the sugarcane showed a tendency to increase in weigh and its sugar content to be higher. By analyzing the soil, the biomass phosphorus showed a tendency to increase. The results of the study imply that phosphate-solubilizing bacteria of organic acid generation type such as the strain22 can either prevent phosphorus from becoming non-soluble calcium phosphates or facilitate solubilizing accumulated phosphorus in the soil when it was applied with organic carbon sources such as bagasse and molasses, and consequently enhance phosphorus absorption by plants. |