|
Author(s): S. Mishima
Abstract:
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.
Outflow as
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.
Understanding total
phosphate resources in farmland and active use of livestock excreta is important
for resource management and for reducing environmental risk.
1 Introduction
Phosphate is an essential element for crop productio...
Pages: 7
Size: 600 kb
Paper DOI: 10.2495/ECO010641
|
|
Download
the Full Article
Price: US$
0.00
This article is part of the WIT OpenView scheme and you can download the full text Adobe PDF article for FREE by clicking the 'Openview' icon below.
 Send
this page to a colleague.
|
Home
Follow WIT Press
WIT Press on Twitter
Wessex Institute of Technology on Blogspot
