Phosphorus index for tropical sandy rice field and pineapple fields


ชื่อเรื่อง Phosphorus index for tropical sandy rice field and pineapple fields ผู้ดำเนินการ SUKREEYAPONGSE, O.1, CHARANWORAPAN, C.1 PONGKANJANA, A. 1 and KANJANATHANASET, K. 1 บทคัดย่อ          Sandy soils are typically infertile and required significant amount of fertilizer to maintain their productivity. Both chemical fertilizer and organic fertilizer such as manures or composts not only provide important nutrients to the growing plant but are also subject to fixation by the soils, surface runoff and leaching into the groundwater. Phosphorus is one of the major factors that algae and microorganism bloom in water bodies. Phosphorus concentrations in the soil, the rate and method of phosphorus application, soil erosion and water runoff are used as factors in the calculation of a phosphorus index (PI).             Paddy sandy soil from Surin Province that typically represented a lowland area and a sandy soil from an upland pineapple production system from Prajuab-kirikan Province were used in this study. PI values calculated were 16.5 and 10 respectively. These values are rather low and indicate that these soils have a low potential in losing phosphorus. PI is an easily procedure to estimate phosphorus lost and surface wastewater risk assessment. Factors that influence PI and the methods of reducing PI were discussed.

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