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If the conditions are suitable for nitrogen-fixation, then the growth of the legume plants need not be limited by lack of nitrogen; whereas, nitrogen is probably the element that first limits the growth and yield of all other crops on your common soils." "Now, what do you think of that, Girls?
With millions of dollars' worth of nitrogen in the air over every acre, our crops are poor just because we don't use it. I wish you would tell me something about the suitable conditions for nitrogen-fixation, Mr. Johnston.
You understand, Girls, that nitrogen-fixation is simply getting nitrogen from the inexhaustible supply in the air by means of little microscopic organisms called bacteria, which live in little balls called tubercles attached to the roots of certain plants called legumes, like cowpeas and clover. Corn and wheat and such crops can't get this nitrogen. Now, Mr.
"BUT I have rambled far from the subject assigned me," Percy continued. "That's only because I interrupt and ask so many side questions," replied Mr. Thornton, "but I hope yet to learn more about those 'suitable conditions' for nitrogen-fixation and nitrification.
Johnston is telling about nitrification, a process which is entirely different from nitrogen-fixation. Excuse me, Mr. Johnston, but I wanted to make this plain to Mrs. Thornton and Miss Russell." "I am glad you did so," Percy replied. "As I was saying, nitrification has no connection whatever with the free nitrogen of the air.
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