Abstract
The purposes of this research was to investigate phosphorus balance focusing on agricultural recycling of organic waste in the Nhue-Day river basin. A field survey on 300 households on the management of organic waste in agriculture and stockbreeding were implemented. Then phosphorus balance during 1980 - 2010 were constructed for this study area.
It was found that amount of phosphorus of organic waste had increased from 16,395 ton-P/year to 44,363 ton-P/year during 1980 - 2010 in the Nhue-Day river basin. Amount of phosphorus of unused organic waste was calculated to be 21,663 t-P/year, whereas chemical fertilizer consumption was estimated to be 26,536 t-P/year in 2010. Comparing these number, if chemical fertilizer was alternated by organic wastes, agriculture in this basin had a potential to receive organic wastes generated in the basin, in terms of phosphorus balance.
