Effect of tillage treatments upon soil tests for soil acidity, soil phosphorus and soil potassium at three soil depths

1970 ◽  
Vol 1 (6) ◽  
pp. 367-375 ◽  
Author(s):  
W. M. Walker ◽  
J. C. Siemens ◽  
T. R. Peck
Keyword(s):  
Soil Acidity ◽  
Soil Phosphorus ◽  
Soil Tests ◽  
Soil Potassium

Correlation of soil phosphorus tests with the response of irrigated perennial pasture to phosphorus fertilizer

1978 ◽  
Vol 18 (91) ◽  
pp. 243 ◽  
Author(s):  
AJ Montgomery ◽  
G Rubenis
Keyword(s):  
Soil Phosphorus ◽  
Maximum Yield ◽  
Correlation Coefficients ◽  
Response Functions ◽  
Phosphorus Fertilizer ◽  
Soil Tests ◽  
Yield Data ◽  
P Values ◽  
Olsen P ◽  
Pasture Yield

The level of soil phosphorus and the response of irrigated perennial pasture to phosphorus fertilizer were measured on 33 sites in the Goulburn Valley of northern Victoria. Eleven of the 33 sites were found to have Olsen P values above 10 p.p.m. and Colwell P values above 30 p.p.m. Of these 11, 9 did not give a pasture response to superphosphate and 2 gave a relatively small response. Functions of the form Y = a - be-CX (where Y = total pasture yield over 12 months (t ha-1), X = rate of superphosphate application (t ha-1), and a, b and c are constants respectively denoting maximum yield, maximum response, and the rate at which maximum yield is approached) were fitted to the yield data from those sites at which a response did occur. b was found to be correlated with a number of soil tests, the highest correlation coefficient being -0.74 for Colwell P. a was significantly correlated with some tests (P < 0.01) but was generally less predictable, and c gave very low correlation coefficients with all soil tests.

scholarly journals Comparison of Soil Phosphorus Tests for Assessing Plant Availability of Phosphorus in an Ultisol Amended with Water-Soluble and Phosphate Rock Sources

2010 ◽  
Vol 10 ◽  
pp. 1679-1693
Author(s):  
E. W. Gikonyo ◽  
A. R. Zaharah ◽  
M. M. Hanafi ◽  
A. R. Anuar
Keyword(s):  
Dry Matter ◽  
Soil Phosphorus ◽  
Cost Effective ◽  
Water Soluble ◽  
Paper Strip ◽  
Triple Superphosphate ◽  
Soil Tests ◽  
Nutrient Sources ◽  
Extractable P ◽  
Bray 1

The effectiveness of different soil tests in assessing soil phosphorus (P) in soils amended with phosphate rocks (PRs) is uncertain. We evaluated the effects of triple superphosphate (TSP) and PRs on extractable P by conventional soil tests (Mehlich 3 [Meh3] and Bray-1 [B1]) and a nonconventional test (iron oxide–impregnated paper, strip). Extracted amounts of P were in the order: Meh3 >B1 > strip. All the tests were significantly correlated (p= 0.001). Acidic reagents extracted more P from TSP than PRs, while the strip removed equal amounts from the two sources. The P removed by the three tests was related significantly to dry matter yield (DMY), but only in the first harvest, except for B1. Established critical P levels (CPLs) differed for TSP and PRs. In PR-fertilized soils, CPLs were 27, 17, and 12 mg P kg-1soil for Meh3, B1, and strip, respectively, and 42, 31, and 12 mg P kg-1soil, respectively, in TSP-fertilized soils. Thus, the strip resulted in a common CPL for TSP and PRs (12 mg P kg-1soil). This method can be used effectively in soils where integrated nutrient sources have been used, but there is need to establish CPLs for different crops. For cost-effective fertilizer P recommendations based on conventional soil tests, there is a need to conduct separate calibrations for TSP- and PR-fertilized soils.

Soil phosphorus tests II: A comparison of soil test–crop response relationships for different soil tests and wheat

2013 ◽  
Vol 64 (5) ◽  
pp. 469 ◽  
Author(s):  
Simon D. Speirs ◽  
Brendan J. Scott ◽  
Philip W. Moody ◽  
Sean D. Mason
Keyword(s):  
Grain Yield ◽  
Confidence Intervals ◽  
Buffer Capacity ◽  
Soil Phosphorus ◽  
Soil Test ◽  
Soil Tests ◽  
P Values ◽  
Soil P ◽  
Soil P Test ◽  
R Value

The performance of a wide range of soil phosphorus (P) testing methods that included established (Colwell-P, Olsen-P, BSES-P, and CaCl2-P) and more recently introduced methods (DGT-P and Mehlich 3-P) was evaluated on 164 archived soil samples corresponding to P fertiliser response experiments with wheat (Triticum aestivum) conducted in south-eastern Australia between 1968 and 2008. Soil test calibration relationships were developed for relative grain yield v. soil test using (i) all soils, (ii) Calcarosols, and (iii) all ‘soils other than Calcarosols’. Colwell-P and DGT-P calibration relationships were also derived for Calcarosols and Vertosols containing measureable CaCO3. The effect of soil P buffer capacity (measured as the single-point P buffer index corrected for Colwell-P, PBICol) on critical Colwell-P values was assessed by segregating field sites based on their PBICol class: very very low (15–35), very low (36–70), low (71–140), and moderate (141–280). All soil P tests, except Mehlich 3-P, showed moderate correlations with relative grain yield (R-value ≥0.43, P < 0.001) and DGT-P exhibited the largest R-value (0.55). Where soil test calibrations were derived for Calcarosols, Colwell-P had the smallest R-value (0.36), whereas DGT-P had an R-value of 0.66. For ‘soils other than Calcarosols’, R-values >0.45 decreased in the order: DGT-P (r = 0.55), Colwell-P (r = 0.49), CaCl2-P (r = 0.48), and BSES-P (r = 0.46). These results support the potential of DGT-P as a predictive soil P test, but indicate that Mehlich 3-P has little predictive use in these soils. Colwell-P had tighter critical confidence intervals than any other soil test for all calibrations except for soils classified as Calcarosols. Critical Colwell-P values, and confidence intervals, for the very very low, very low, and low P buffer capacity categories were within the range of other published data that indicate critical Colwell-P value increases as PBICol increases. Colwell-P is the current benchmark soil P test used in Australia and for the field trials in this study. With the exception of Calcarosols, no alternative soil P testing method was shown to provide a statistically superior prediction of response by wheat. Although having slightly lower R-values (i.e. <0.1 difference) for some calibration relationships, Colwell-P yielded tighter confidence intervals than did any of the other soil tests. The apparent advantage of DGT-P over Colwell-P on soils classified as Calcarosols was not due to the effects of calcium carbonate content of the analysed surface soils.

Waste stream utilisation for sustainable viticulture

2005 ◽  
Vol 51 (1) ◽  
pp. 1-8 ◽  
Author(s):  
R.H. Agnew ◽  
D.C. Mundy ◽  
T.M. Spiers ◽  
M.M. Greven
Keyword(s):  
Soil Phosphorus ◽  
Grape Juice ◽  
Field Trials ◽  
Leaf Nitrogen ◽  
Wine Industry ◽  
First Year ◽  
Soil Potassium ◽  
Site Variation ◽  
Second Year ◽  
Phosphorus Levels

Field trials were established at four vineyards in January 1999 to evaluate the effects of four mulch mixtures on different soil and plant parameters. Mulches were made from wine industry and other commercially available plant and animal wastes. Soil, grape petioles, grape leaves and grape juice were analysed over three seasons. The mulches applied released considerable quantities of nutrients, which were available for use by the grapevines. Generally, the type of mulch used had little impact on the parameters that were measured and the greatest differences occurred between non-mulched and mulch treatments. Soil pH showed an increase at three of the four sites after application of mulch. Soil phosphorus increased moderately at one site and substantially at the other three sites in the first year and soil potassium levels increased dramatically at all sites in the first year. After the application of mulches in 1999 the petiole nitrate levels increased dramatically at all sites, however there were no differences in the second year. In the third year petiole nitrate levels were again high indicating that the differences between years was probably largely attributable to differences in rainfall received among the three seasons. Petiole potassium levels also increased after the application of mulch, however the increase was nowhere near as large as the increase in soil potassium. The use of mulch increased leaf nitrogen and potassium levels but not phosphorus levels. The use of mulch did increase juice potassium, however there was greater seasonal and site variation than variation due to the effect of mulch.

scholarly journals The Effect of Efficacy Local Isolates of Paenibacillus Bacteria on Available Soil Phosphorus and Growth of Cultivars Wheat (Triticum Aestivum L.)

2021 ◽  
Vol 923 (1) ◽  
pp. 012073
Author(s):  
Ghanim Bahlol Noni ◽  
Abd Ayat Hassan
Keyword(s):  
Triticum Aestivum ◽  
Field Experiment ◽  
Plant Height ◽  
Potassium Concentration ◽  
Soil Phosphorus ◽  
Dry Weight ◽  
Triticum Aestivum L ◽  
Silty Clay ◽  
Soil Potassium ◽  
Phosphorous Concentration

Abstract A field experiment was carried out to study the effect of bio-inoculation with three local isolates of P. polymyxa and three Varieties of wheat on the growth and yield of the wheat plant (Triticum aestivum L). In the second agricultural research station affiliated to the College of Agriculture - University of Al-Muthanna, a field experiment was conducted in Al-Muthanna Governorate for the year 2020 in silty clay Loam soil texture. The experiment was designed in a randomized complete block method (RCBD) and with three replications. The experiment included two factors, where the first factor represents the local isolates of four levels, symbolized by P0-P1-P2-P3, and the second factor represents the three wheat varieties, Buhouth class 22, Iraq class, and Ibaa 99, which symbolized C1-C2-C3 respectively. The results showed the following: First: The P3 bio-pollination treatment achieved a significant increase in soil phosphorus, potassium, and nitrogen in the available part at the flowering stage, as the highest average was recorded for them (11.39 mg kg −1 soil - 1.4300%-1.4,000%), and the P2 treatment was superior for both soil potassium and plant height. And the dry weight, the highest average for them was recorded (157.8 mg kg −1 - 92.6 cm - 10.61 g plant −1). Second: As for the cultivars, they differed in most of the characteristics of the study. The Iraq cultivar excelled in soil phosphorous concentration with an average of (11.06 mg kg −1 soil), while Buhouth cultivar 22 was superior in soil potassium with an average of (158.02) mg kg −1 soil. Ibaa 99 had been recorded concentration nitrogen and potassium in plants with averages of (1.4208,1.3474%). Third: When the isolates overlapped with the cultivars, a discrepancy was observed. It gave Samawa isolate with Bohouth class 22 by recording the highest average in soil potassium concentration and plant height amounting to (166.7 mg kg −1 soil, 99.8 cm) respectively, while Al-Khidr isolate with Ibaa 99 cultivar in nitrogen and potassium concentration plant, where it reached (1.4567-1.4400)%, while the isolate without addition outperformed with the cultivar Iba 99 for dry weight, as it reached its highest average (11.40 gm plant −1). The isolate of vegetables also outperformed Iraq cultivar for phosphorous concentration in soil, as it recorded the highest average of (12.30) mg kg −1 soil.

Comparative study of phosphorus and potassium levels of basaltic soils associated with scrub and forest communities on the Darling Downs

Soil Research ◽  
1983 ◽  
Vol 21 (4) ◽  
pp. 527 ◽  
Author(s):  
CR Ahern ◽  
SE MacNish
Keyword(s):  
Forest Soils ◽  
Soil Phosphorus ◽  
Strong Association ◽  
Soil Series ◽  
Soil Tests ◽  
Surface Samples ◽  
Forest Sites ◽  
Extractable Phosphorus ◽  
Phosphorus And Potassium ◽  
Soil Groups

Morphologically similar scrub and forest basalt soils were investigated for differences in soil phosphorus and potassium levels. Surface samples (0-10 cm) from 181 scrub and 111 forest sites were analysed for five soil tests: 0.05 M H2SO4-extractable phosphorus, 0.5 M NaHCO3- extractable phosphorus, 0.05 M HCl-extractable potassium, total phosphorus and total potassium by X-ray fluorescence. Highly significant differences (P <0.001) between scrub and forest soils were found for each soil test when all sites were assessed in terms of regional differences based on vegetation. These differences were then investigated further for each of the three common Great Soil Groups - black earths, euchrozems and lithosols - and then for six individual soil series common to both the scrub and forest areas. An unexplained geographic trend in phosphorus values previously reported (1972) in the same area could be accounted for by this difference between scrub and forest soils. Similar differences in soil phosphorus and potassium for scrub and forest soils on other parent materials are also discussed. It was clearly shown that the scrub means were always greater than the forest means for all five soil tests for all soils combined, each Great Soil Group and each soil series, and that there is a strong association between vegetation distribution and these soil differences.

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