Urgent Evoke

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Phosphorus is one of the immobile nutrients in the soil. It occurs in the soil in both organic and inorganic forms, the latter being of greater importance in mineral soils. Inorganic P is known to occur in three main categories, viz., apatite which is a discrete phase of P compounds, P sorbed on surface of Fe, Al and Ca as soil constituents and P present within materials of Fe and Al compounds. Sodic soils are rich in total and Olsen-P. The content in reclaimed sodic soils, on the other hand, decreased due to inactivation by added gypsum (soluble sodium-phosphates are converted to less soluble Ca-phosphates) and higher sorption of added P by soil. Most of the soils have the ability to retain soluble P against recovery by plants with the result that crop uptake of phosphorus rarely exceeds 20-25% in the first growing season. This is due to various types of reactions occurring in the soil such as adsorption, precipitation, chemical and biological transformations occurring in the soil that revert the added soluble P into various insoluble forms. The reversion rate, release and availability of P are influenced not only by contact period between P and the soil but also by factors such as temperature and moisture.

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Comment by Bongumusa on March 18, 2010 at 12:34pm
I would like to thank you for sharing with such good and high quality information. I believe that you did your homework very well,you prepare it and you presented it in a very meaningful and well presentable manner.If I just imagine you, you seems to be good and brillient guy. I reminds me Authors of Economic Science. I hope that you are the one of the most knowlegeable persons in world. People like you,I tend to pay much respect due to their impact in development change. I hope that those words may give you energy to give us more than we expect.I like the explaination about organic and non-organic as well as the fact base on mineral soil.
Comment by Starling on March 18, 2010 at 1:04pm
Thanks Pradip. Can you write a bit about how you would design urban food growing solutions with this in mind?
Comment by Pradip Dey on March 18, 2010 at 3:18pm
Thanks Alice. I will revert back to you shortly. Regards.
Comment by Pradip Dey on March 18, 2010 at 3:27pm
Thank you, Bonqumusa for your nice words for me. It's your state of mind which can praise. It only shows your honest attitude. I do think you are a sincere person by nature. Thanks and regards.

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