Bray/Kurtz, Mehlich III, AB/D and ammonium acetate extractions of P, K and MG in four oklahoma soils

Hanlon, Edward A.; Johnson, G. V.

doi:10.1080/00103628409367475

Cited by 75 publications

(30 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As expected, the slope of the equation relating the Mehlich3 and Bray1 extractants was close to one. Similar results have been obtained for soils from 67 locations across Pennsylvania (USA), [9] in four Oklahoma soils, [34] and from diverse locations throughout the United States. [35] There appear to be some differences in the ability of the different extractants to access the inherent, well-stabilized pool of phosphorus on the different soils as suggested by the equation intercepts.…”

Section: Phosphorus Soil Tests Forsupporting

confidence: 72%

“…The R 2 values obtained for the relationship between the different agronomic soil tests are within the range obtained by others. [9,[34][35][36] Wolf and Baker [35] found that the relationship between Bray1-P and Olsen-P for noncalcareous soils was influenced by the texture of the soils from diverse regions of the United States. They observed that the quantity of P removed by the Bray1 test was almost three times greater than that of the Olsen test.…”

Section: Phosphorus Soil Tests Formentioning

confidence: 99%

See 1 more Smart Citation

Phosphorus Soil Tests for Environmental Assessment in Subtropical Soils

Sotomayor‐Ramírez

Martínez

Mylavarapu

et al. 2004

Communications in Soil Science and Plant Analysis

View full text Add to dashboard Cite

Soil test phosphorus (P) is used to evaluate the nutritional status of a soil in relation to a crop's yield response. Recently, there is interest to calibrate agronomic soil tests to predict risk of P transport in runoff. An experiment was conducted to evaluate the relationships among three agronomic soil test P extraction methods (Olsen, Bray1, Mehlich3) and dissolved P in water (0.01 M CaCl 2 extractable P) in five representative soils of tropical and subtropical areas in Puerto Rico and Florida. The soils were of the series Astatula (Entisol), San Anto´n (Mollisol), Caguabo (Inceptisol), Corozal (Ultisol), and Bayamo´n (Oxisol). Soils were amended with three inorganic P levels as triple super phosphate, three organic P levels as broiler litter, and their combinations in an incomplete factorial design for a total of 11 treatments. Soils were sampled during 46 weeks and soil test P was measured. Exploratory statistics were used to evaluate relationships among the variables. Relationships using the Astatula soil were studied separately as inherently high soil test P values influenced regressions greatly. A near 1:1 relationship between soil test P extracted using Bray1 and Mehlich3, and Mehlich3 and Olsen extractants was obtained. In general, improved relationships were obtained using individual soils as soil pH and mineralogy influenced the amount of P extracted. Critical soil test concentrations to reach dissolved P concentrations of 1 mg P L À1 were (95% confidence intervals in parenthesis) 179 (174-185), 197 (190-207), and 252 (243-266) ppm for Olsen, Bray1, and Mehlich3 extractants, respectively for all soils combined excluding Astatula. The critical values obtained in combination with soil-landscape information can be used to establish guidelines for P management in agricultural soils.

show abstract

Section: Phosphorus Soil Tests Forsupporting

confidence: 72%

Section: Phosphorus Soil Tests Formentioning

confidence: 99%

Phosphorus Soil Tests for Environmental Assessment in Subtropical Soils

Sotomayor‐Ramírez

Martínez

Mylavarapu

et al. 2004

Communications in Soil Science and Plant Analysis

View full text Add to dashboard Cite

show abstract

“…Iowa on soil testing 28 mg P kg -1 as Bray-I (B-I) method [28 mg P M-III kg -1 using conversion equations in Hanlon and Johnson (1984), Wolf and Baker (1985) and Tran et al (1990)]. Bullock et al (1993) found no response of corn to P in Illinois on a soil testing 68 mg P B-I kg -1 [63 mg P M-III kg -1 using conversion equations in Hanlon and Johnson (1984), Wolf and Baker (1985) and Tran et al (1990)].…”

Section: Soil Test Partitioning Modelsmentioning

confidence: 99%

Agri-environmental models using Mehlich-III soil phospho rus saturation index for corn in Quebec

Pellerin¹,

Parent²,

Tremblay³

et al. 2006

Can. J. Soil. Sci.

View full text Add to dashboard Cite

L. 2006. Agri-environmental models using Mehlich-III soil phosphorus saturation index for corn in Quebec. Can. J. Soil Sci. 86: 897-910. Soil phosphorus (P), which is potentially a risk for environmental contamination, is currently interpreted using soil P saturation in North America. Our objective was to assess the ratio of P to aluminum (Al) in the Mehlich-III (M-III) soil test to build P requirement models for corn and soybean. We analyzed 129 corn and 19 soybean P fertilizer trials. For corn, the (P/Al) M-III ratio improved soil fertility classification compared with P M-III alone. The critical P M-III value as determined by the Cate-Nelson procedure was found to be 31.5 mg P M-III kg -1 , close to published values. The critical (P/Al) M-III ratios of 0.025 for > 300 g clay kg -1 soils and 0.040 for ≤ 300 g clay kg -1 soils differed significantly between the two soil groups. For (P/Al) M-III ratios above 0.214, there was no positive response to added P for all soils regardless of texture. Using published critical environmental (P/Al) M-III ratios of 0.076 for > 300 g clay kg -1 soils and 0.131 for ≤ 300 g clay kg -1 soils as benchmarks values, agri-environmental P requirement models were built using conditional expectations of 50 to 80% of computed optimum P values within a soil class. A validation study supported the low critical (P/Al) M-III ratios and the 50% conditional expectation model except for a high carbon soil which was outside the application range of the models. However, banded P decreased corn yield at four validation sites although the model predicted positive response to P. Soybean did not respond to P except at extremely low fertility levels ((P/Al) M-III ≤ 0.02) and behaved as a P-mining crop even in low-P soils. Corn-soybean rotations can reduce soil P to low (P/Al) M-III ratios with minimal agronomic risk. For personal use only.

show abstract

“…Differences in soil:solution ratio and shaking times probably account for much of this variability. Hanlon & Johnson (1984) used a 1 :20 soil:solution ratio and a 5 min extraction time whereas Doll & Lucas (1973) did not specify the method precisely.…”

Section: K Extraction By Different Methodsmentioning

confidence: 99%

“…The Inter-method comparisons made by Hanlon & Johnson (1984) showed that mean extractable soil K values, using the Bray No. 1 method, were 19% lower than the NH 4 0Ac method.…”

Section: K Extraction By Different Methodsmentioning

confidence: 99%

A comparison of methods used for the extraction of K in soils of the Western Cape

Thompson

1995

South African Journal of Plant and Soil

View full text Add to dashboard Cite

A number of com mon soil extractants, mainly those used for soil P, were used to extract K from a range of widely differing soils which occur in the Western Cape; the objective being to evaluate the simultaneous determination of P and K availability. Soil samples were taken mainly from the upper horizons of 110 profiles representing the dominant soil forms occurring in this region. The soils varied from highly weathered, deep, well-drained acid Oxisols (Hutton form) to younger less developed duplex Alfisols (Swartland, Glenrosa and Kroonstad forms) and deep sandy Inceptisols (Fernwood form). The soils exhibited a wide range of values of clay content, CEC, pH and exchangeable K. Seven soil P extraction methods (Bray No.1, Bray No.2, citric acid 1 %, Olsen, ISFEI (Na), Ambic and Mehlich No.3) were compared with two K e~traction methods, (0.5M NH 4 CI and M NH 4 0Ac). All the methods gave K indices which were significantly correlated with one another (r> 0.9). The extractants containing NH4 + were better correlated with one another than with the other extractants. Significant linear relationships were obtained with all the methods between extractable K and soil K-values determined using the NH 4 0Ac method over a range of values from < 10 mg kg-1 to over 300 mg kg-l. Apart from the results of the Bray NO.1 and ISFEI methods, which exhibited lower extractability, all fi2 values were greater than 0.9. It appears that any of the methods used for extracting soil P are suitable for assessing the K status of the soils of this region.'n Aantal algemene grondekstraheermiddels, hoofsaaklik die wat gebruik word vir grond P, is gebruik om K te ekstraheer van 'n reeks uiteenlopende gronde wat in die Wes-Kaap voorkom. Die doel van die studie was om die g-bruik van die metodes vir die gelyktydige bepaling van P en K te evalueer vir toeganklikheid. Grondmonsters is geneem hoofsaaklik van die bogrond horisonte van 110 profiele wat verteenwoordig is van die dominante grondvorms wat in die gebied voorkom. Die grond het gevarieer van hoogs verweerde, diep, goedgedreineerde suur Oksisols (Hutton vorm), jonger, minder-ontwikkelde dupleks Alfisols (Swartland, Glenrosa en Kroonstad grondvorms), en diep sanderige Inceptisols (Fernwood vorm). Die gronde het wyd verskil met betrekking tot klei-inhoud, KUK, pH en uitruilbare K-waardes. Sewe grond P ekstraksiemetodes (Bray No.1, Bray No. 2, sitroensuur (1 %), Olsen, ISFEI (Na), Ambic en Mehlich No.3) is met twee K ekstraksiemetodes (0.5 M NH 4 CI en M NH 4 0Ac) vergelyk. AI die metodes het K indekse gelewer wat betekenisvol met mekaar gekorrelleer is (r > 0.9). Die ekstraheermiddels wat NH4+ bevat, het beter met mekaar gekorreleer teenoor die ander metodes. Betekenisvolle liniere vergelykings is gekry met al die metodes tussen ekstraheerbare K teenoor die NH 4 0Ao-metode vir grond K-waardes van minder as 10 mg kg-1 tot oor 300 mg kg-l. Behalwe vir die Bray No.1 en ISFEImetodes wat 'n laer K ekstraksie getoon het, is aile fi2 waardes hoer as 0.9. Dit kom voor asof enige een van die metodes wat...

show abstract

Bray/Kurtz, Mehlich III, AB/D and ammonium acetate extractions of P, K and MG in four oklahoma soils

Cited by 75 publications

References 15 publications

Phosphorus Soil Tests for Environmental Assessment in Subtropical Soils

Phosphorus Soil Tests for Environmental Assessment in Subtropical Soils

Agri-environmental models using Mehlich-III soil phospho rus saturation index for corn in Quebec

A comparison of methods used for the extraction of K in soils of the Western Cape

Contact Info

Product

Resources

About