Does anyone have expierence taking land from forest land to farmland? thanks,
Daniel ----- Original Message ----- From: "Lloyd Charles" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, October 10, 2002 7:04 AM Subject: Re: Nutrient blockers > > ----- Original Message ----- > From: Roger Pye <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, October 10, 2002 5:54 PM > Subject: Nutrient blockers > > > > Does anyone know whether aluminium locks calcium up in soils? > > > > roger > > -- > > Hi Roger > > Other way round!!- calcium locks up aluminium - Its a > chain of events - calcium depletion - then low pH - then the acidity makes > aluminium available - Al is a +++ so its some of the last to come unstuck. > So you are not going to have available aluminium at toxic levels unless you > have the extreme low pH that comes with a serious lack of calcium (or > magnesium in a real sandy soil). This will be at pH less than 4.5 calcium > chloride - in our red soils we can go as low as 4.2 before serious trouble - > in your country probably 4.4 would be the cutoff point. . Aluminium levels > rocket upwards as the pH drops that last half point or so. So the aluminium > is a result of a lack of available calcium not the cause of it. > Cheers > Lloyd Charles > > >
