scholarly journals Assessing the ability of soil tests to estimate labile phosphorus in agricultural soils: Evidence from isotopic exchange

Geoderma ◽  
2019 ◽  
Vol 337 ◽  
pp. 350-358 ◽  
Author(s):  
Sabina Braun ◽  
Ruben Warrinnier ◽  
Gunnar Börjesson ◽  
Barbro Ulén ◽  
Erik Smolders ◽  
...  
Keyword(s):  
Isotopic Exchange ◽  
Agricultural Soils ◽  
Soil Tests ◽  
Labile Phosphorus

Soil Tests as Risk Indicators for Leaching of Dissolved Phosphorus from Agricultural Soils in Ontario

2012 ◽  
Vol 76 (1) ◽  
pp. 220-229 ◽  
Author(s):  
Y. T. Wang ◽  
T. Q. Zhang ◽  
I. P. O'Halloran ◽  
C. S. Tan ◽  
Q. C. Hu ◽  
...  
Keyword(s):  
Agricultural Soils ◽  
Risk Indicators ◽  
Soil Tests ◽  
Dissolved Phosphorus

Soil Tests for Estimating Labile, Soluble, and Algae‐Available Phosphorus in Agricultural Soils

1985 ◽  
Vol 14 (3) ◽  
pp. 341-348 ◽  
Author(s):  
A. M. Wolf ◽  
D. E. Baker ◽  
H. B. Pionke ◽  
H. M. Kunishi
Keyword(s):  
Agricultural Soils ◽  
Available Phosphorus ◽  
Soil Tests

scholarly journals Micronutrients limiting pasture production in Australia

2019 ◽  
Vol 70 (12) ◽  
pp. 1053 ◽  
Author(s):  
R. F. Brennan ◽  
B. Penrose ◽  
R. W. Bell
Keyword(s):  
Agricultural Soils ◽  
Animal Health ◽  
Farming Systems ◽  
Dairy Production ◽  
Micronutrient Deficiencies ◽  
Nutrient Inputs ◽  
Soil Tests ◽  
Pasture Production ◽  
Tropical Regions ◽  
Micronutrient Status

Low levels of plant-available micronutrients were an inherent feature of many agricultural soils in Australia, mostly due to the prevalence of highly weathered soil parent materials. The diagnosis and correction of the widespread deficiencies of micronutrients, especially copper (Cu), molybdenum (Mo) and zinc (Zn), were prerequisites for the development of productive, legume-based pastures in southern Australia. In subtropical and tropical regions, Mo deficiency commonly limited pasture-legume production. Soil treatments involving micronutrient fertiliser incorporated in soils, or applied as additives to superphosphate, were generally effective in alleviating micronutrient deficiencies. In the low-output dryland pasture systems, the annual removal of micronutrients in wool and meat is small compared with rates added in fertiliser. Hence, in general, the residues of soil-applied micronutrient fertilisers remain effective for many years, for example, up to 30 years for Cu. By contrast, shorter residual values occur for manganese (Mn) fertiliser on highly calcareous soils, and for Zn in high-output pasture systems such as intensive dairy production. In the last two decades since the recommendations for micronutrient management of pastures were developed, there have been many changes to farming systems, with likely implications for micronutrient status in pastures. First, increased cropping intensity and low prices for wool and meat have meant lower nutrient inputs to pastures or to the pasture phase of rotations with crops. However, when pastures have been rotated with crops, ongoing small additions of Cu, Zn and Mo have been common. In cropping phases of farming systems, lime application and no-till may have altered the chemical and positional availability of micronutrients in soils to pastures. However, there has been little study of the impacts of these farming-systems changes on micronutrient status of pastures or profitability of the production system. The intensification of dairy production systems may also have altered the demand for, and removal rates of, micronutrients. Soil tests are not very reliable for Mn or Mo deficiencies, and well-calibrated soil tests for boron, Cu and Zn have been developed only for limited areas of pasture production and for a limited range of species. There is limited use of plant tests for nutrient management of pastures. In conclusion, there is limited knowledge of the current micronutrient status of pastures and their effects on animal health. Pasture production would benefit from targeted investigation of micronutrients status of pasture soils, pasture plants and micronutrient-linked animal-health issues.

Soil Analysis: An Interpretation Manual

1999 ◽  
Keyword(s):  
Test Data ◽  
Nutrient Management ◽  
Agricultural Soils ◽  
Soil Analysis ◽  
Soil Test ◽  
Calibration Data ◽  
Soil Tests ◽  
Factors Affecting ◽  
Related Group

Soil Analysis: An Interpretation Manual is a practical guide to soil tests. It considers what soil tests are, when they can be used reliably and consistently, and discusses what limits their application. It is the first nationally accepted publication that is appropriate for Australian soils and conditions. The first three chapters review the general principles and concepts of soil testing, factors affecting soil test interpretation and soil sampling and handling procedures. The next two chapters describe morphological indicators of soil and include colour plates of major Australian agricultural soils. These are followed by a series of chapters which present soil test calibration data for individual elements or a related group of tests such as the range of soil tests used to interpret soil acidity. Each of these chapters also summarises the reactions of the particular element or parameter in the soil and describes the tests commonly used in Australia. The final chapter presents a structured approach to nutrient management and making fertiliser recommendations using soil test data. The manual will be of particular interest to soil and environmental scientists, farm advisers, consultants and primary producers who will find the manual an essential reference to understanding and interpreting soil test data. Many of the soil tests evaluated in the book are used throughout the world. Soil Analysis: An Interpretation Manual was commissioned and developed by the Australian Soil and Plant Analysis Council (ASPAC). It comprises the work of 37 experts, which has been extensively peer reviewed.

scholarly journals Differences in available phosphorus evaluated by soil tests in relation to detection by colorimetric and ICP-AES techniques

2010 ◽  
Vol 56 (No. 6) ◽  
pp. 297-304 ◽  
Author(s):  
J. Matula
Keyword(s):  
Agricultural Soils ◽  
Colorimetric Detection ◽  
Water Extraction ◽  
Available Phosphorus ◽  
Soil Test ◽  
Colorimetric Determination ◽  
Soil Tests ◽  
Analytical Technique ◽  
End Point ◽  
Phosphorus Determination

Differences in the evaluation of soil phosphorus status by three soil tests (Mehlich 3, extraction with NH<sub>4</sub>-acetate and water extraction) were tested on 63 agricultural soils with different agrochemical characteristics from the territory of the Czech Republic. Differences between the colorimetric determination of phosphorus and ICP technique were studied. The median of the values of phosphorus supply in soils determined by soil tests was considerably different. Compared to the colorimetric detection of water extraction of soils the median of the NH<sub>4</sub>-acetate test showed 2.2 times higher values and in Mehlich 3 test the values were 34.8 times higher. The largest difference between the end-point analytical techniques of phosphorus determination, colorimetry and ICP-AES, was observed in the soil test of water extraction. The median of the values determined by ICP-AES was higher by 47%. In NH<sub>4</sub>-acetate extraction of soils the median of the measured values of phosphorus was higher by 12% and in Mehlich 3 extraction by 7%. Differences in phosphorus concentrations determined by colorimetry and by ICP-AES increased as the phosphorus supply in soils decreased. When the supply of 'available' phosphorus in soil is given, it is always necessary to specify the used soil test including the end-point analytical technique of phosphorus determination to avoid the misleading interpretation of results. The problem of phosphorus in agriculture and in the environment requires thorough revision and methodical standardization.

Comparing soil test kits with standard lab-based soil tests for agricultural soils

Crops & Soils ◽  
2019 ◽  
Vol 52 (2) ◽  
pp. 18-20
Author(s):  
Swati Sharma ◽  
Amitava Chatterjee
Keyword(s):  
Agricultural Soils ◽  
Soil Test ◽  
Soil Tests

scholarly journals Possible phosphorus losses from the top layer of agricultural soils by rainfall simulations in relation to multi-nutrient soil tests

2009 ◽  
Vol 55 (No. 12) ◽  
pp. 511-518 ◽  
Author(s):  
J. Matula
Keyword(s):  
Agricultural Soils ◽  
Soil Layer ◽  
Water Extraction ◽  
Phosphorus Leaching ◽  
Soil Test ◽  
Soil Tests ◽  
P Concentration ◽  
Extreme Load ◽  
Minimum Interval ◽  
Phosphorus Losses

The objective of the study was to examine a possibility of predicting phosphorus leaching from the top layer of agricultural soils by rainfall simulations by means of three multi-nutrient soil tests: Mehlich 3, NH<sub>4</sub>-acetate extraction and water extraction (1:5, w/v). Another objective was to determine parameters of maximum phosphorus losses after an extreme load of rainfall on the top layer. Forty soils from different localities of the Czech Republic were used for the experiment. A leaching experiment was conducted in pedological cylinders with a soil layer of about 1 cm and with the bottom from a glass microfibre filter with pores 1.2 μm in size. Within 15 days the soils were flooded ten times with 25 mm of simulated rainfall in a minimum interval of 1 day. The closest regression between the soil test and phosphorus leaching was computed for NH<sub>4</sub>-acetate soil test (<i>R</i><sup>2</sup> = 0.8831) and Mehlich 3 test (<i>R</i><sup>2</sup> = 0.8572) after the first application of 25 mm of rainfall. In water extraction it was for the mean of 10 simulated rainfalls (<i>R</i><sup>2</sup> = 0.8674). As leaching proceeded, the closeness of regression diminished due to fluctuations of P concentration in leachates (increases and decreases), mainly in soils with higher <i>P</i>-test. The increase in P concentration could be caused by the activation of phosphorus from Fe-phosphates under anaerobic conditions in wet soils. The steepest decrease in P concentration in leachates was observed in light soils with low CEC value and higher initial <i>P</i>-test.

Examination of NOxand CO2production in agricultural soils

2007 ◽  
Vol 35 (2) ◽  
pp. 689-692 ◽  
Author(s):  
Krisztina Kristóf ◽  
Györgyi Kampfl ◽  
György Heltai ◽  
Erika Nótás ◽  
Abdousalam Algaidi
Keyword(s):  
Agricultural Soils
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