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"The Illinois Experiment Station has practiced a four-year rotation of corn, cowpeas, wheat, and clover on an experiment field on the common prairie soil down in 'Egypt, and the average yield of wheat has been only twelve bushels per acre during the last four years, but when legume crops were plowed under and limestone and phosphorus applied, the average yield during the same four years was twenty-seven bushels per acre."
Légume was a very pleasant companion, lively, good-natured, with a decided penchant for the pretty side of humanity, and continually haunted with the idea that a princess was to carry him off from his mistress in spectacles, Madame Art, and convey him to the land of Cocaigne, where they never make, only buy, paintings of which articles, in parenthesis, Monsieur Achille had a number for sale.
"Yes, that is the better way to put it," Percy admitted, "but the fact is he can not only get this nitrogen for nothing by means of legume crops, but he is paid for getting it, because those crops are profitable to raise for their own value. Clover, alfalfa, cowpeas, and soy beans are all profitable crops, and they all have power to use the free nitrogen of the air.
The only apparent exception to this is in case of legume crops, such as clover, alfalfa, peas, beans, and vetch, which have power to utilize the free nitrogen by means of their symbiotic relationship with certain nitrogen-fixing bacteria which live, or may live, in tubercles on their roots.
"In the legume system the minerals applied have more than doubled the value of the crops produced, have paid their cost, and made a net profit of one hundred and forty per cent. on the investment, in direct comparison with the unfertilized land.
If the soil is heavy and moisture abundant, straw may be desirable, while in the case of a light soil and scant moisture, may be injurious. There is no particular difference in the straw of the different grains from this point of view. The Best Legume for Cover Crop. What would you advise to sow as a crop to plow under? When should it be sowed, and when plowed under?
When a legume thus gains nitrogen from the air, it develops upon its roots little bunches known as root nodules or root tubercles. The nodules are sometimes the size of the head of a pm, and sometimes much larger than this, occasionally reaching the size of a large pea, or even larger.
At dinner, besides the Household, were the Princess Mathilde, Monsieur Ollivier, Monsieur Perriere, the Duke de Persigny, Baron Haussmann, and several statesmen. The corn came in due time served as legume. I was mortified when I saw it appear, brought in on eight enormous silver platters, four ears on each. It looked pitiful! Silk, robe de chambre and all, steaming like a steam-engine.
West, "from these different analyses or invoices, and from your discussion of these results, I take it that you would not advise me to purchase any commercial fertilizer for use on the land we are still using in my rotation; but you think we should make large use of limestone and legume crops." "Yes, Sir.
Neither crops nor animals can be made out of nothing, and no independent system of livestock farming can add to the soil a pound of any element of plant food, aside from nitrogen, and even this addition is due to the legume crops grown and not to the live stock.
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