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Absorption of Phosphorus by Cotton from Fertilizers of Different Phosphorus Water Solubilities as Related to Stage of Plant Growth at the Time of Application
Author(s) -
Fuller Wallace H.,
Tucker T. C.,
Carpenter E. W.,
Abbott J. L.
Publication year - 1963
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1963.03615995002700040015x
Subject(s) - phosphorus , aqueous solution , chemistry , phosphate , fertilizer , phosphate fertilizer , nitric acid , absorption of water , calcareous , nitrogen , water soluble , absorption (acoustics) , agronomy , inorganic chemistry , botany , materials science , organic chemistry , composite material , biology
The absorption of P by cotton, an indeterminate type plant, from two radioactive nitric phosphate fertilizers of about 17 and 44% water‐soluble P and aqueous solution of H 3 PO 4 fortified with NH 4 NO 3 to give an N/P ratio equal to the two 20‐20‐0 nitric phosphates was studied in a field experiment at rates of 0, 20, and 60 pounds P per acre on a calcareous soil. Applications of the fertilizers were drilled 6 inches deep and 6 inches to the side of the row at three different stages of plant growth to relate absorption of P with different growth stages. The data indicate that more P was derived from the fertilizer at the 60‐pound rate than the 20‐pound rate of application. At least as much or more P was absorbed from the nitric phosphates of 17 and 44% water‐soluble P as from the 100% water‐soluble P of H 3 PO 4 applied in aqueous solution when they were applied in April and June. However, when the same materials were applied on July 19, less P was absorbed from the nitric phosphates than the wholly soluble aqueous H 3 PO 4 fertilizer. The relative effectiveness of the nitric phosphates was greatest for the early application and decreased with the subsequent later applications.