Itthiphon khong kan baeng sai pui phosphate to kan charoen toepto khong naedaeng nai din na chut tang tang.
1985
Prayoon Sawatdee | Saovanee Soontornpitak | Pailin Lekkong
Pot experiment was conducted in an open air in July 1985 at the Soil Microbiology Research Group, Division of Soil Science, Department of Agriculture. The objective of this study was to evaluate the effect of split applications of phosphate fertilizer on azolla grown on Rs, Re and Bl soil series. Completely randomized design with 3 replications was employed. Each replication comprised 5 application treatments of 1, 2, 4, 5 and 10 splits. For each application treatment was applied 6 kg P2O5/rai. A Clay cylinder pot with 25 cm diameter and 30 cm height was used. Each pot was filled with 15 cm depth of soil and submerged with 8 cm depth of filtered water for one week before inoculation of azolla. There were no differences between the phosphate application and no phosphate application treatments on Re and Bl soil series. However, for Rs soil series, a higher N content in azolla was obtained when phosphate fertilizer was applied. The pH of water was raised to the alkaline condition. A lower pH was observed for Rs series, resulted in better biomass production. However, P concentration of the azolla grown water of all treatments was not decreased below the optimum level for azolla growth.
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