. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 206 NITROGEN, PHOSPHORUS AND POTASSIUAl No farmer, however successful, should ever think of trying to maintain the fertility of his soil through the use of commercial fertilizers alone. Legumes, grass, green manuring crops and barn- 1 # . ... ..^i^^ .. .^ii^ M^ '^^P^^ ' J0m^. ^' ^^^ 4»:' :.,.^/§Wii ^ -i^' â :i:VI' -'â â â â ::i?>;:S:; : - Fig. 137.âFour rows without fertilizer in the drill. To the left and right 125 pounds of a 1-8-1 mixed fertilizer were applied per acre in the drill
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 206 NITROGEN, PHOSPHORUS AND POTASSIUAl No farmer, however successful, should ever think of trying to maintain the fertility of his soil through the use of commercial fertilizers alone. Legumes, grass, green manuring crops and barn- 1 # . ... ..^i^^ .. .^ii^ M^ '^^P^^ ' J0m^. ^' ^^^ 4»:' :.,.^/§Wii ^ -i^' â :i:VI' -'â â â â ::i?>;:S:; : - Fig. 137.âFour rows without fertilizer in the drill. To the left and right 125 pounds of a 1-8-1 mixed fertilizer were applied per acre in the drill with a fertilizer attachment on the planter. (See Fig. 138.). Fig. 138.âAn eighty-one per cent increase in silage corn at harvest time. To left, unfer- tilized, tons per acre; to right, fertilized, tons per acre. A long-cropped soil. yard manure are indispensable. Except for truck crops and pota- toes, it is wise economy to use commercial fertilizers in a definite plan of more permanent soil improvement and fertility mainte- nance rather than to make light applications mainly to stimulate. 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 Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
