charles.hersey at xonxoff.com
Fri Mar 3 05:33:00 EST 1995
GB´> I would like to demonstrate Nitrogen deficeny, Potassium
´> deficency, and Potash deficency in soybeans for a class room project.
´> I thought the easiest way to demonstrate these plant stresses
´> would be to:
´> 1) propagate the soybeans in a metromix type media, (low
´> 2) feed the control plants NO3, K, and H2PO4, and
´> 3) feed the demo pots the same amount of the nutrients supplied
´> to the control, minus the nutrient I wanted deficent.
´> I wondered if there is a better method? My concern is that
´> the soil media may still supply enough nutrients to overcome the
´> deficency I'm trying to create. What would effectively tie up each
´> macronutrient and make it unavailable to the plant?
´> All methods and comments are welcome! Thanks!
GB´Try using acid washed sand. You won't have any problems of contamination
´of your experiment with nutrients from the soil.
Also, IMHO, you might try to put up a few types of indicators. Tobacco
leaves are great indicators. Radishes are easy to grow.
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