Re: RE: Re: RE: Re: Re: Re: Re: Re: Yellow River: Facts on File

[Michael Perelman <michael@xxxxxxxxxxxxxxxxx>]

Yes, irrigation leads to salinization, but you were discussing siltation.

On Thu, Jun 28, 2001 at 12:38:30AM +0100, Mark Jones wrote:
> Michael Perelman:
> >
> > I don't understand how it would lead to salinization, but the E. Asian ag.
> > system was remarkably sustainable.  Silting seems to be more related to
> > removing the forest cover.
> >
>
> >>What Happens when you Irrigate?
> Irrigation inevitably leads to the salinization of soils and waters. In the
> United States yield reductions due to salinity occur on an estimated 30% of
> all irrigated land. World wide, crop production is limited by the effects of
> salinity on about 50% of the irrigated land area. In many countries
> irrigated agriculture has caused environmental disturbances such as
> waterlogging, salinization, and depletion and pollution of water supplies.
> Concern is mounting about the sustainability of irrigated agriculture. <<
>
> from:
>
> http://www.ussl.ars.usda.gov/salinity.htm
>
> Mark Jones
>

--
Michael Perelman
Economics Department
California State University
Chico, CA 95929

Tel. 530-898-5321
E-Mail michael@xxxxxxxxxxxxxxxxx