Estimation of Soil Phosphorus Levels in Shrimp Ponds

2000 ◽  
Vol 5 (1) ◽  
pp. 115
Author(s):  
G. Ritvo ◽  
M. Sherman ◽  
A. L. Lawrence ◽  
T. M. Samocha
Keyword(s):  
Soil Phosphorus ◽  
Shrimp Ponds ◽  
Phosphorus Levels

Mineral uptake and growth of sorghum colonized with VA mycorrhiza at varied soil phosphorus levels

1990 ◽  
Vol 13 (7) ◽  
pp. 843-859 ◽  
Author(s):  
P. S. Raju ◽  
R. B. Clark ◽  
J. R. Ellis ◽  
J. W. Maranville
Keyword(s):  
Soil Phosphorus ◽  
Va Mycorrhiza ◽  
Mineral Uptake ◽  
Phosphorus Levels

Ecophysiological response in leaves of Caragana microphylla to different soil phosphorus levels

2013 ◽  
Vol 51 (2) ◽  
pp. 245-251
Author(s):  
T. T. Zhao ◽  
N. X. Zhao ◽  
Y. B. Gao
Keyword(s):  
Soil Phosphorus ◽  
Caragana Microphylla ◽  
Ecophysiological Response ◽  
Phosphorus Levels

scholarly journals Phosphorus relationships and production of extrametrical hyphae by two types of willow ectomycorrhizas at different soil phosphorus levels

1990 ◽  
Vol 115 (2) ◽  
pp. 259-267 ◽  
Author(s):  
MELANIE D. JONES ◽  
D. M. DURALL ◽  
P. B. TINKER
Keyword(s):  
Soil Phosphorus ◽  
Phosphorus Levels

Prediction of yield responses to phosphorus by established Greenleaf desmodium/grass pastures in south-east Queensland using chemical tests

1980 ◽  
Vol 20 (105) ◽  
pp. 477
Author(s):  
GE Rayment ◽  
RC Bruce ◽  
BG Cook
Keyword(s):  
Soil Phosphorus ◽  
Residual Variance ◽  
Total Soil ◽  
Plant Chemical ◽  
Diagnostic Samples ◽  
Total Soil Phosphorus ◽  
Independent Variable ◽  
Phosphorus Status ◽  
Yield Responses ◽  
Phosphorus Levels

Phosphorus topdressing experiments (rates to 60 kg P ha-1) on 18 commercial Desmodium intortum cv. Greenleaf/grass pastures were conducted over a 4-year period in south-east Queensland. The aim was to determine whether yield responses, which occurred only in the Greenleaf component at six sites, could be predicted using soil or plant chemical tests. Acid-(0.005 M H2SO4) and bicarbonate-(0.5 M NaHCO3) extractable tests of phosphorus status in 0-10 cm soil samples each explained about 60% of the variance in Greenleaf relative yields. The residual variance was not significantly reduced by the inclusion of terms for total soil nitrogen, total soil phosphorus, exchangeable calcium and pH into the independent variable. These empirical soil phosphorus tests had higher predictive value than plant tests based on phosphorus concentrations in tops and diagnostic samples of Greenleaf. With both acid- and bicarbonate-extractable phosphorus, yield responses are likely in the Greenleaf component when phosphorus levels in most soils are below 22 ppm. Above 29 ppm, no response would be expected

Using soil and plant analyses in decisions about fertilisers: a farmer’s perspective

1998 ◽  
Vol 38 (7) ◽  
pp. 745 ◽  
Author(s):  
W. R. Gibson
Keyword(s):  
Soil Phosphorus ◽  
Phosphorus Concentration ◽  
Plant Analysis ◽  
Ph Measurements ◽  
Initial Soil ◽  
Potassium Application ◽  
Phosphorus And Potassium ◽  
Yield Responses ◽  
The Relationship ◽  
Phosphorus Levels

Summary. This paper describes the part played by soil and plant analysis in decisions about fertilisers used on a mixed pastoral and cropping farm at Scone, in the Northern Midlands of Tasmania. Measurements of phosphorus and potassium concentrations in soils provide an essential framework for choosing fertilisers for crops and pastures. Use of lime with certain crops is determined by pH measurements. Neither soil nor plant analysis are used in choosing nitrogenous fertilisers. Fifteen paddocks were tested 7–8 years after initial soil tests (Colwell extracts). Phosphorus concentrations (mean ± s.e.) had risen by 13 ± 5 µg/g (P<0.05) and potassium by 89 ± 19 µg/g (P<0.001). In addition, the relationship between changes in these concentrations and the total phosphorus or potassium applied to individual paddocks was examined. Phosphorus concentration rose (P<0.001) by 5.9 µg/g for each 10 kg/ha additional phosphorus applied over the 7–8 years. Application of phosphorus at 7 kg/ha annually was enough to maintain soil phosphorus levels. No such relationship was detected for potassium. Application of lime at 4 t/ha raised the pH by about 1 unit. These results provide some reassurance about the behaviour of soils on Scone in response to the practices used in commercial mixed farming. The importance for the farmer of analyses being reliable is stressed, as is the need for well-based interpretation of the analytical results in order that the yield responses to fertilisers can be foreseen. Evidence about the financial returns produced by the increased yields is often lacking, especially for grazing enterprises.

Soil Phosphorus Levels and Stratification as Affected by Fertilizer and Compost Applications

2007 ◽  
Vol 4 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Douglas J. Soldat ◽  
A. Martin Petrovic
Keyword(s):  
Soil Phosphorus ◽  
Phosphorus Levels

Effect of Soil Phosphorus Levels on Phosphorus Runoff Concentrations from Turfgrass

2008 ◽  
Vol 199 (1-4) ◽  
pp. 33-44 ◽  
Author(s):  
Douglas J. Soldat ◽  
A. Martin Petrovic ◽  
Quirine M. Ketterings
Keyword(s):  
Soil Phosphorus ◽  
Phosphorus Runoff ◽  
Phosphorus Levels

Soil phosphorus levels needed for equal P uptake from four soils with different water contents at the same water potential

1992 ◽  
Vol 143 (1) ◽  
pp. 93-98 ◽  
Author(s):  
M. S. Cox ◽  
S. A. Barber
Keyword(s):  
Water Potential ◽  
Soil Phosphorus ◽  
P Uptake ◽  
Water Contents ◽  
Phosphorus Levels
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