. The chemistry of soils and fertilizers. Soils; Fertilizers. CHAPTER VII PHOSPHATE FERTILIZERS 208. Importance of Phosphorus as Plant Food.— Phosphorus in the form of phosphates is one of the essential elements of plant food. None of the higher orders of plants can complete their growth unless supplied with this element in some form. The illus- tration (Fig. 31) shows an oat plant which received no phosphates, but was supplied with all of the other elements of plant food. As soon as the phosphates stored up in the seed had been utilized, the plant ceased to grow, and after a few weeks died of
. The chemistry of soils and fertilizers. Soils; Fertilizers. CHAPTER VII PHOSPHATE FERTILIZERS 208. Importance of Phosphorus as Plant Food.— Phosphorus in the form of phosphates is one of the essential elements of plant food. None of the higher orders of plants can complete their growth unless supplied with this element in some form. The illus- tration (Fig. 31) shows an oat plant which received no phosphates, but was supplied with all of the other elements of plant food. As soon as the phosphates stored up in the seed had been utilized, the plant ceased to grow, and after a few weeks died of phosphate starvation, having made the total growth shown in the illustration. All crops demand their phosphates at an early stage in their development. Wheat takes up eighty per cent, of its Oat planrgrown phosplioric acid in the first half of without phosphorus, ti^e growing period,36 while clover has assimilated all of its phosphoric acid by the time the plant reaches full bloom.^^ Phosphates ac-. Fig- 31-. 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 Snyder, Harry, 1867-1927. Easton, Pa. , The Chemical Publishing Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectfertilizers
