. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 200 NITROGEN, PHOSPHORUS AND POTASSIUM. O a o o O o a > O â a 03 CO fl JS 2 o _ ^ CQ 1 a o o a e3 03 P. 03 O a o P5 CO H. 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

---

Size: 996px × 2509px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920