. Annual report. Agricultural education. 1890.] PUBLIC DOCUMENT —No. 31. 69 Having reached this fundamental law for phosphoric acid and potash manuring, we turn to the subject of nitrogen manuring, and first ask, Must we manure all domestic plants with nitrogen ? To this question we say, No. Pease, vetches, clover, lupines^ lucerne and similar plants make far less demands on the nitrogen content of the soil than oats, barley, wheat, rye, buckwheat, beets, carrots, potatoes, tobacco, flax, rape, grass, spurrey, white mustard, etc. ; so that only in exceptional cases can it be rational to manure
. Annual report. Agricultural education. 1890.] PUBLIC DOCUMENT —No. 31. 69 Having reached this fundamental law for phosphoric acid and potash manuring, we turn to the subject of nitrogen manuring, and first ask, Must we manure all domestic plants with nitrogen ? To this question we say, No. Pease, vetches, clover, lupines^ lucerne and similar plants make far less demands on the nitrogen content of the soil than oats, barley, wheat, rye, buckwheat, beets, carrots, potatoes, tobacco, flax, rape, grass, spurrey, white mustard, etc. ; so that only in exceptional cases can it be rational to manure the first-named plants with nitrogen salts. They pos- sess a peculiar power to avail themselves of atmospheric nitrogen, while the latter lack this ability, and must therefore draw the entire amount of nitrogen necessary for their development from the soil. I have carried out, in connection with this question, very many experiments in the most diverse directions, and will here adduce a few examples from my results. Manurings of 18, 31 and 45 pounds of nitrogen per acre were given various crops. Barley, rye, oats, wheat, buckwheat, car- rots, potatoes, beets, flax, rape, grass and spurrey furnished con- siderably increased yields, and the latter stood in exact relation to the increased manuring; while with pease, red clover, lupines, vetches and lucerne, no increase of yield was obtained. Let the following figures serve as illustration. For more convenient read- ing, I have placed the yield obtained with barley, without nitrogen manuring, at 100, and have reckoned the other yields to corre- spond : —. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Agricultural College; Massachusetts Agricultural Experiment Station; Massachusetts Agricultural Experiment Station. Annual report of the Hatch E
Size: 1981px × 1261px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookpublisherbostonsn, bookyear1
