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Studies on the uptake of phosphorus from 32 P‐labelled superphosphate by crops. I.—Oats
Author(s) -
Verma R. D.,
Dainty J.,
Simpson K.
Publication year - 1959
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740100206
Subject(s) - phosphorus , agronomy , soil water , phosphate , crop , phosphorite , acre , chemistry , nutrient , ammonium , grain yield , greenhouse , zoology , environmental science , biology , organic chemistry , soil science
Soils from two sites, one high and one low in available phosphorus, were used in a greenhouse pot experiment with different rates of application of 32 P‐labelled superphosphate in combination with various dressings of ammonium sulphate. The crop was sampled at three stages of growth. The pattern of uptake was different in the two soils. In the low‐phosphate soil the percentage of fertiliser‐derived phosphorus in the plant fell steadily as the season progressed, but in the high‐phosphate soil there was apparently a renewed demand for phosphorus by the plant at the time of grain formation. This demand was met by fertiliser‐phosphorus. There was no indication that the extra uptake during this period enhanced grain formation. Grain yield was, in fact, reduced by the application of 160 Ib. of P 2 O 5 , per acre as superphosphate. The uptake of soil‐phosphorus was depressed so much by applications of superphosphate that the total uptake in treated pots from both soils was less than that in the control at maturity.