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Updated: June 20, 2025
These statements are not mere opinions, but determined facts whose accuracy stands unquestioned. On another field at Rothamsted, England, the average yield of barley for the same sixty years was 43 bushels an acre where nitrogen, phosphorus and calcium were regularly applied, 42.6 where all five elements including potassium and magnesium were added, but only 14.3 on unfertilized land.
Pure sand soil weighs about one-fourth more, while pure peat soil weighs only half as much as normal soil." "I wish you would tell me," said Mr. Thornton, "what the fertilizers cost that have been used on that Rothamsted wheat field." "The annual application of nitrogen has been one hundred twenty-nine pounds per acre," said Percy. "What will it cost?"
Recent experiments at Rothamsted show that in the absence of phosphates no nitrification will occur. Further proof of the ferment theory is afforded by the fact that antiseptics are fatal to nitrification. In the presence of a small quantity of chloroform, carbon bisulphide, salicylic acid, and apparently also phenol, nitrification entirely ceases. The action of heat is equally confirmatory.
Of course this place is Rothamsted, England, where as an average for twenty-six years the yield of potatoes was 51 bushels an acre on unfertilized land and exactly 102 bushels where only a phosphate fertilizer was applied.
But the soil at Rothamsted is no poorer in phosphorus than is the average soil of the United States; and these results are given here not only because they are the oldest and most trustworthy the world affords, but because they are strictly applicable to the production of common crops on vast areas of agricultural land in our own country. The Form of Phosphorus to Use
Phosphorus Helps Good Farming There is also but one place in the world where we can learn the results secured from the application of phosphorus for a period of thirty-six years in a good system of farming; and again this place is Rothamsted. In 1848 Sir John Lawes and Sir Henry Gilbert began investigations on Agdell Field.
"You mentioned some long-continued scientific investigations which I assumed referred to the yield of crops. What were they?" "I meant such investigations as those at Rothamsted and also those conducted at Pennsylvania State College. I have some of the exact data here in my note book. "In 1848, Sir John Lawes and Sir Henry Gilbert began at Rothamsted, England, two four-year rotations.
"On another Rothamsted field the phosphorus actually removed in fifty-five crops from well-fertilized land is two-thirds as much as the total phosphorus now contained in the plowed soil of adjoining untreated land. "In the early 80's the Pennsylvania Agricultural Experiment Station began a four-year crop rotation, including corn, oats, wheat, and mixed clover and timothy.
Even the 100-bushel crop of corn per acre is known to have been produced in many places on exceptionally rich land, and yet the ten-year average yield in the United States is only 25 bushels to the acre. 200 Per Cent for Nitrogen On Broadbalk Field at Rothamsted, England, wheat has been grown on the same land every year for about two-thirds of a century.
Why not? At Rothamsted, England, they have averaged thirty-eight and four-tenths bushels of wheat per acre during the last twenty years in an experiment extending over sixty years, and they have done this without a forkful of manure or a pound of purchased nitrogen. Why not?
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