Results 251 to 260 of about 7,676,313 (294)

Evaluation of available phosphorus in highly phosphorus-deficient soils

Plant and Soil, 1964
In a greenhouse experiment single superphosphate was supplied in varying rates to lettuce test plants grown in soils of very low phosphorus availability.
U. Kafkafi, J. Hagin, M. Özuygur, G. Tezer, M. Ateşalp, Ş. Elçi, A. Şaplakoglu   +6 more
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Phosphorus Source and Soil Properties Effects on Phosphorus Availability

Soil Science, 2011
Phosphorus (P) application in excess of crop needs has increased the concentration of P in soils and has been linked to freshwater eutrophication leading to P-based nutrient management. However, insufficient data are available relating soils properties, P-source solubility, and rate and time of application to develop sound guidelines. We investigated P
Francirose Shigaki, Andrew Sharpley
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Soil phosphorus availability to millet roots

Communications in Soil Science and Plant Analysis, 1978
Abstract Soil solution P level is believed to be important in determining P uptake rates from soil. The objective of this research was to investigate the relation between initial P concentration in the soil solution and P flux into the root. Millet (Panicum milaceum) was grown on five soils each of which was adjusted to six Cli levels by addition of P.
J. A. Adepetu, S. A. Barber
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Studies of Phosphorus Availability in Organic Soils

Soil Science Society of America Journal, 1958
Abstract Experiments were conducted on the phosphorus status of organic soils by correlating the phosphorus solubility in various extractants with percentage yields of tomato, peppermint, and onion. Seven different extractants, including water, were compared using four ratios of soil volume to extractant volume.
J. E. Larsen, G. F. Warren, Ruble Langston   +2 more
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Evaluation of Soil Tests for Phosphorus Availability

Madras Agricultural Journal, 1969
A number of methods are in use to determine the available phosphorus in soils. Some of these methods have given satisfactory results in certain soils, but none has been found to be applicable under all soil conditions. Hence in this study an attempt is made to compare a number of soil tests for available phosphorus with the phosphorus uptake by ragi ...
BALASUBRAMANIAN V, DURAIRAJ D
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A Bioassay for Comparing Phosphorus Availability in Soils

The Journal of Applied Ecology, 1979
(1) A bioassay method, based on the uptake of 32P from 5 x 10-6 M phosphate solution during a 15 min period, was used to detect phosphorus deficiency in plants. (2) The method was tested using birch (Betuld verrucosa Ehrh.) and sycamore (Acerpseudoplatanus L.) seedlings grown in (a) sand culture supplied with 1-100 Pg P ml 1, (b) phosphorus deficient ...
A. F. Harrison, D. R. Helliwell
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Soil phosphorus sorption and availability as a function of high phosphorus fertilizer additions

Communications in Soil Science and Plant Analysis, 1995
Abstract After a 3‐months equilibration of soil with phosphorus (P) (up to four times the respective P sorption capacity), equilibrium P concentration (EPCo), standard P requirement (SPR), P sorption index (SI), and P availability by Bray I, Olsen, water and iron‐oxide paper strip methods were determined on three soils of the Latium region of Italy ...
R. Indiati, A. N. Sharpley, C. Izza, A. Figliolia, B. Felici, P. Sequi   +5 more
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EFFECTS OF pH AND PHOSPHORUS RATES ON SOIL-SOLUTION PHOSPHORUS AND PHOSPHORUS AVAILABILITY

Soil Science, 1985
Results from short-term, absorption experiments with roots in Ca-free culture solutions have led to the concept that phosphorus is absorbed largely or exclusively as the monovalent ion, H2PO4-.
J. F. ADAMS, J. W. ODOM
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A Soil Test for Phosphorus Based Upon Fractionation of Soil Phosphorus: I. Correlation of Soil Phosphorus Fractions with Plant‐Available Phosphorus

Soil Science Society of America Journal, 1964
Abstract The forms of P in 24 soils were determined by chemical fractionation. The available P was determined by plant growth experiments. Regression analysis of the P fractions with available P showed that iron P explained most of the variation.
A. H. Al‐Abbas, S. A. Barber
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Roles of biochar in improving phosphorus availability in soils: A phosphate adsorbent and a source of available phosphorus

Geoderma, 2016
Abstract In this study, the amounts of phosphorus (P) in nine types of biochar (one natural woody biochar and eight manufactured plant derived biochars) extractable by deionized water, 0.5 N NaHCO 3 (pH = 8.5) and 0.5 N H 2 SO 4 , respectively, and P adsorption on single biochar or soil/biochar mixtures were examined to investigate the potential ...
Hanzhi Zhang, Chengrong Chen, Evan M. Gray, Sue E. Boyd, Hong Yang, Dongke Zhang   +5 more
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