Author(s): S. Mishima
To evaluate phosphate flow in Japan in 1997, I constructed a framework then
estimated and evaluated it.
Phosphate input to farmland was 4.3 times larger than
output, and the largest in input was chemical fertilizers, 79% of input.
water-soluble phosphate from farmland was small; therefore, a large amount of
phosphate has remained in the farmland soil and has accumulated year by year.
Livestock excreta production was about half that of chemical fertilizer, though
38% of livestock excreta was not utilized.
Though available phosphate in farmland has been surveyed several times
systematically, total phosphate has not been surveyed.
phosphate resources in farmland and active use of livestock excreta is important
for resource management and for reducing environmental risk.
Phosphate is an essential element for crop productio...
Size: 600 kb
Paper DOI: 10.2495/ECO010641
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