Using Pi soil test to estimate available phosphorus in biosolids-amended soil*

In field experiments, conducted at 18 locations during a 3-year period, tuber yields on zero-P plots ranged from 49.7–95.5% of those obtained with optimum P fertilization. Each of three chemical methods used to estimate available soil P showed a wide range of values for the different locations.When Bray's modification of the Mitscherlich equation was used to express the relationship between soil test values and yield response to applied P, there were appreciable differences in c1 values which varied with soil series and soil test methods.Polynomial response curves showed that, irrespective of the chemical method used, if soils were grouped on the basis of available P into "high", "medium" and "low" classes, response to applied P was much less in the high than in the medium and low classes. Response curves also showed that both P requirements and maximum yields varied with different soil series.

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Simultaneous extraction of available phosphorus and potassium with a new soil test: A modification of Kelowna extraction

Communications in Soil Science and Plant Analysis ◽

10.1080/00103629409369068 ◽

1994 ◽

Vol 25 (5-6) ◽

pp. 627-635 ◽

Cited By ~ 86

Author(s):

P. Qian ◽

J. J. Schoenaru ◽

R. E. Karamanos

Keyword(s):

Available Phosphorus ◽

Soil Test ◽

Simultaneous Extraction ◽

Phosphorus And Potassium

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Evaluation of some soil test methods in acid soils for available phosphorus for pea of Senapati district of Manipur (India)

International Journal of Agriculture Environment and Biotechnology ◽

10.5958/2230-732x.2016.00010.3 ◽

2016 ◽

Vol 9 (1) ◽

pp. 63 ◽

Cited By ~ 2

Author(s):

Haribhushan Athokpam ◽

Goutam Kumar Ghosh ◽

Herojit Singh Athokpam ◽

Shabir Hussain Wani ◽

Somorjit Akoijam ◽

...

Keyword(s):

Acid Soils ◽

Test Methods ◽

Available Phosphorus ◽

Soil Test

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COMPUTER MAPPING OF ALBERTA SOIL TEST DATA

Canadian Journal of Soil Science ◽

10.4141/cjss70-001 ◽

1970 ◽

Vol 50 (1) ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

D. R. CAMERON ◽

J. A. TOOGOOD

Keyword(s):

Test Data ◽

Moving Average ◽

Mapping Function ◽

Available Phosphorus ◽

Soil Test ◽

Nitrogen Levels ◽

Ph Values ◽

Soil Zone ◽

Weighted Moving Average ◽

Phosphorus Levels

A circular mapping function based on the principle of a weighted moving average was applied in a computer program to the available Alberta soil test data, and nutrient levels of soils in the province were plotted and contoured. The finished maps displayed clearly marked trends. Variation in nitrate-nitrogen levels for samples from fallow and cropped land was readily seen, but correlation with soil zone was not well marked. Available phosphorus levels were relatively higher on the Solonetzic soils in central Alberta. Exchangeable potassium levels appeared to be closely related to the soil zones of Alberta. The mapped pH values presented the least variable picture. The electronic computer was essential for the mapping of data as reported in this study, and future applications of the computer to other soil data appear to be unlimited.

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An evaluation of several soil tests for predicting wheat yield response to superphosphate in Victoria

Australian Journal of Experimental Agriculture ◽

10.1071/ea9680052 ◽

1968 ◽

Vol 8 (30) ◽

pp. 52

Author(s):

JV Mullaly ◽

JKM Skene ◽

R Jardine

Keyword(s):

Field Experiments ◽

Wheat Yield ◽

Response Variability ◽

The Other ◽

Yield Response ◽

Available Phosphorus ◽

Soil Test ◽

Soil Tests ◽

Using Data ◽

Soil Groups

The predictability of three different measures of wheat yield response to superphosphate from each of four soil test measures of available phosphorus (0-6 inches) was examined, using data from field experiments over the period 1951 to 1965. The associations were studied separately within the three great soil groups that are dominant over the wheatgrowing areas of Victoria. Whichever measure of yield response was considered, soil bicarbonate P test measurement gave the best basis for prediction. However, at most, only 26 per cent of the yield response variability was predictable, and the other three tests were substantially less successful. Under the general conditions considered, where yield response is subject to a variety of uncorrected environmental deficiencies, it is concluded that the soil tests for P investigated in this paper are of doubtful practical value.

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