Effect of sampling depth on bicarbonate soil phosphorus test values

1992 ◽  
Vol 32 (1) ◽  
pp. 121-124 ◽  
Author(s):  
M. D. A. Bolland
Keyword(s):  
Soil Phosphorus ◽  
Sampling Depth ◽  
Soil Phosphorus Test

The effects of different levels of N, P and K on the yields, nitrogen content and kernel weights of malting barley (var. Proctor)

1968 ◽  
Vol 70 (3) ◽  
pp. 361-367 ◽  
Author(s):  
T. F. Gately
Keyword(s):  
Soil Phosphorus ◽  
Malting Barley ◽  
Fertilizer N ◽  
Yield Increase ◽  
Kernel Weights ◽  
The Mean ◽  
Grain Nitrogen ◽  
Percent Nitrogen ◽  
Different Levels ◽  
Soil Phosphorus Test

SUMMARYThe effects of N, P and K applied broadcast on yields, percentage nitrogen and kernel weights of barley were studied over two seasons.The average yield increase over thirteen sites was 5·1 cwt and 8·2 cwt from applications of 35 lb and 70 lb/acre of fertilizer N respectively. A mean yield increase of 4·4 cwt/acre was obtained from 27 lb P at four sites where the soil phosphorus test did not exceed 2 ppm P. Potassium applied at rates varying from 0 to 168 lb K/acre increased yields at one site only and decreased them at another site.The mean grain nitrogen percent without fertilizer N was 1·47 and applications of 35 and 70 lb N/acre gave increases of 0·06 and 0·19% respectively. The overall effects of P and K on the percent nitrogen in the grain were small.Applications of 35 and 70 lb N/acre increased the mean 1000 kernel weights by 0·7 and 1·0 g respectively. When lodging occurred kernel weights were decreased. Fertilizer P and K had little effect on the kernel weights.The significance of these data are discussed in relation to previous cropping and rainfall during the growing season and during the previous winter.

THE REACTION OF TWO LUVISOLIC FOREST SOILS TO PHOSPHATE FERTILIZATION

1977 ◽  
Vol 57 (4) ◽  
pp. 385-395
Author(s):  
J. BAKER
Keyword(s):  
Forest Soils ◽  
Soil Phosphorus ◽  
Aluminum Phosphate ◽  
Phosphorus Compounds ◽  
Phosphorus Fertilization ◽  
Litter Layer ◽  
Reaction Products ◽  
Sampling Depth ◽  
Chemical Extractants ◽  
Phosphate Fertilization

Response of two forested Luvisolic soils to phosphorus fertilization was compared using chemical extractants known to be effective in removing certain soil phosphorus compounds. Fifteen months following fertilization application, the Mercoal series (Bisequa Luvisol) showed total phosphorus decreases in each of the soil horizons or layers sampled. To sampling depth, phosphorus concentrations in all but the NH4F extract (mainly aluminum phosphate) were lower in fertilized than in control samples. Vegetative uptake was considered to be mainly responsible for phosphorus decreases and movement, especially noticeable in the deeper mineral horizons. The Coalspur series (Orthic Luvisol) showed an appreciable phosphorus increase in the litter layer although both mineral horizons, Ae and Bt, exhibited losses. The Coalspur soil exhibited increases in soil phosphorus susceptible to all but the NH4F extractant. The data suggest a greater mobility and movement of soil phosphorus in these Luvisolic forest soils than usually observed in cultivated soils. Following fertilization, Mercoal probably had a greater number of phosphorus compounds (reaction products perhaps) more readily available than did the Coalspur.

Effects of topdressed superphosphate on the sheep and pasture production of dryland lucerne in central western New South Wales

1975 ◽  
Vol 15 (75) ◽  
pp. 475 ◽  
Author(s):  
H Brownlee ◽  
BJ Scott ◽  
RD Kearins ◽  
J Bradley
Keyword(s):  
New South ◽  
Soil Phosphorus ◽  
New South Wales ◽  
Stocking Rate ◽  
Gross Margin ◽  
Pasture Production ◽  
Wool Production ◽  
South Wales ◽  
Dry Conditions ◽  
Soil Phosphorus Test

Merino ewes at 3.7, 4.9 and 6.2 ha-1 grazed dryland lucerne (Medicago sativa cv. Hunter River) topdressed annually with superphosphate at 0, 125 and 251 kg ha-1, from September 1969 until December 1972, in an experiment at Condobolin, New South Wales. Superphosphate increased ewe liveweights, total forage available and phosphorus content of the forage by a small amount but did not increase wool production per head. The Bray soil phosphorus test in the top 8 cm of the soil profile rose from 8 p.p.m. to 48 p.p.m., but most of the phosphorus was concentrated in the 0-4 cm layer, where we consider that dry conditions reduced its availability to the lucerne. As stocking rate increased, ewe liveweights and wool production per head decreased and the sheep required more handfeeding for survival. The treatment with the greatest gross margin was the lowest stocking rate with nil fertilizer.

The ability of the DGT soil phosphorus test to predict pasture response in Australian pasture soils - a preliminary assessment

2015 ◽  
Vol 32 (1) ◽  
pp. 27-35 ◽  
Author(s):  
L. L. Burkitt ◽  
S. D. Mason ◽  
W. J. Dougherty ◽  
P. W. G. Sale
Keyword(s):  
Soil Phosphorus ◽  
Preliminary Assessment ◽  
Soil Phosphorus Test

scholarly journals Revised Soil Phosphorus Test Ratings (RSPTR), Critical Limits (CL) and Phosphorous Recommendation for Maize

2017 ◽  
Vol 6 (11) ◽  
pp. 295-309
Author(s):  
M. Chandrakala ◽  
C.A. Srinivasamurthy ◽  
Sanjeev Kumar ◽  
S. Bhaskar ◽  
V.R.R. Parama ◽  
...  
Keyword(s):  
Soil Phosphorus ◽  
Critical Limits ◽  
Soil Phosphorus Test

Evaluation of Mehlich 3 as an Agri-Environmental Soil Phosphorus Test for the Mid-Atlantic United States of America

2002 ◽  
Vol 66 (6) ◽  
pp. 2016-2032 ◽  
Author(s):  
J. T. Sims ◽  
R. O. Maguire ◽  
A. B. Leytem ◽  
K. L. Gartley ◽  
M. C. Pautler
Keyword(s):  
United States ◽  
United States Of America ◽  
Soil Phosphorus ◽  
Soil Phosphorus Test
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