Calcium, magnesium and potassium in clay, silt and fine sand fractions of some Finnish soils

Kaila, Armi; Ryti, Ritva

doi:10.23986/afsci.71693

Cited by 7 publications

(6 citation statements)

References 2 publications

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“…The same appears to be true also in respect to the occurrence of K, though to somewhat lesser degree. The relative poorness of clay fraction in Ca observed in the previous paper (Kaila and Ryti 1968) is revealed in the lower average content of total Ca in the heavy clay soils than in the samples with less than 60 % clay, and also in the low but statistically significant negative correlation between the Ca and clay contents of these soils.…”

Section: Discussionmentioning

confidence: 71%

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Calcium, magnesium and potassium in mineral soils from the southern half of Finland

Kaila

1973

AFSci

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Abstract. 210 samples of mineral soils from the southern half of Finland with mainly an acid precambrian bedrock, were analysed for the total contents of Ca, Mg and K, and for the portion of these nutrients which could be exchanged by N NH 4 OAc (pH 7), dissolved by 0.1 N HCI at room temperature, or released by N HCI at 50°C.The total content of Ca was lowest in samples of heavy clay, 0.78±0.14 % in the surface soils and 0.92±0.10 % in the deeper layers. The mean content in the groups of other soils was at least about 1.1 %. The total content of Mg increased with an increase in the clay content (r = o.Bl***). It ranged from 0.6±0.1 % in the sand and fine sand samples to 1.53±0.19 % in the heavy clay soils of the surface layers and to 1.89±0.12 % in those of the deeper layers. Also in the groups of loam and silt soils and of the coarser clay soils, respectively, the Mg content was in the deeper layers higher than in the surface soils.The total content of K also increased with the clay content (r=o.73***) from 1.7 ± 0.1 % in the sand and fine sand soils to 2.74±0.21 % in the heavy clay soils of the surface layers and to 3.10±0.07 % in those of the deeper layers.The portion of exchangeable Ca was relatively high: in the groups of surface soils from more than one tenth to one third of the total amount. The corresponding average amounts released by even the more drastic treatment with acid were not markedly higher.Only a few per cents of total Mg were exchangeable and slightly higher amounts were dissolved by 0.1 N HCI, whereas the treatment with N HCI at 50°C released about half of the total Mg. Exchangeable K and K dissolved by 0,1 N HCI did not exceed 1 % of the total K, except slightly in the heavy clay soils; the average amounts released by N HCI ranged from 5 to 18 % of the total K.The plant availability of these nutrients was discussed.In a previous work (Kaila and Ryti 1968), characteristic differences in the total contents of Ca, Mg and K in various particle size fractions of some Finnish mineral soils were found. In all the 30 samples analysed, the Ca content was in the clay fraction (< 2/

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Section: Discussionmentioning

confidence: 71%

“…In a previous work (Kaila and Ryti 1968), characteristic differences in the total contents of Ca, Mg and K in various particle size fractions of some Finnish mineral soils were found. In all the 30 samples analysed, the Ca content was in the clay fraction (< 2/<m) distinctly lower than in the silt (2-20 /on) and fine sand (20 -200 /urn) fractions.…”

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confidence: 99%

Calcium, magnesium and potassium in mineral soils from the southern half of Finland

Kaila

1973

AFSci

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“…Soil exchangeable cations, such as Mg, are closely related to clay content and the type of clay minerals (Metson, 1974). Kaila and Ryti (1968) investigated Mg distribution across soil particle sizes and indicated that the clay size fraction had about 14 times more exchangeable Mg than the fine sand fraction in Finnish soils. In addition, Kaila and Ryti (1968) reported high correlations of total Ca and Mg with clay content ( r = 0.80 and 0.79, respectively).…”

Section: Resultsmentioning

confidence: 99%

Soil texture and organic matter prediction using Mehlich‐3 extractable nutrients

Drescher,

Slaton,

Roberts

et al. 2024

Agrosystems Geosci & Env

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Soil organic matter (SOM) and texture are key properties influencing soil nutrient and water dynamics but are time‐consuming procedures for analytical laboratories. Our objective was to evaluate SOM and soil texture predictions using Mehlich‐3 nutrients and pH in Arkansas soils. Particle size was determined by the hydrometer method (2‐ and 8‐h readings) and SOM by loss on ignition. Two datasets were used to calibrate clay and sand (n = 409) and SOM (n = 1019) prediction models using simple and multiple regression. Estimated cation exchange capacity was highly correlated with clay, resulting in significant prediction models alone or combined with phosphorus (P); pH and copper (Cu); or pH, sodium (Na), and Cu (R2 = 0.84, 0.88, 0.89, and 0.90; p < 0.0001, respectively). Soil nutrients were weakly correlated with sand, resulting in a prediction model with moderate accuracy when using Mehlich‐3 P, calcium (Ca), Na, iron (Fe), and manganese (Mn) (R2 = 0.49; p < 0.0001). Clay and sand prediction models presented comparable accuracy when validated on a new dataset (n = 103). Predicted sand and clay showed good accuracy in grouping soils into medium (65%) and fine (96%) textural categories but had limited ability to define the coarse‐textural group (9%). SOM had moderate goodness‐of‐fit statistics for calibration and validation datasets using pH, P, Ca, Na, Mn, and zinc (R2 = 0.65 and 0.70, respectively; p < 0.0001). Mehlich‐3 nutrients can be used to estimate soil texture and assist with crop management decisions, but further research is needed to improve SOM prediction.

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“…The type of the soil also seems to determine the cation composition in the leachate. It is likely that seepage water from a clay soil is more diluted but contains relatively more magnesium than seepage water from coarser soils, because our clay soils are quite rich in exchangeable magnesium (Kaila 1973).…”

Section: Discussionmentioning

confidence: 99%

Leaching of plant nutrients from cultivated soils: I Leaching of cations

Hartikainen

1978

AFSci

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Leaching of native and added basic cations was studied in a lysimeter experiment. The trial was carried out with three surface soil samples: sand, fine sand and sandy clay. The effect of the acidic precipitation on the leaching losses was studied by using 0.025 M sulfuric acid as irrigation solution. The cation concentration in the leachate seemed to be determined by the CEO of the soil sample. The relative and absolute leaching losses were lowest in the sandy clay and highest in the sand soil. Five percolations extracted most abundantly calcium and least abundantly sodium, the losses of magnesium and potassium were of about the same magnitude. In regard to cation reserves of the soils the relative amounts leached usually followed the sequence: Na >Mg≈ Ca>K. Fertilization seemed to promote the leaching of cations, especially that of soil calcium. Water extracted 10 to 37 % of added magnesium, but only 2 to 6 % of added potassium due to the effective retention. The acid in the irrigation water increased the losses of all cations studied, most drastically the losses of divalent ones.

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Calcium, magnesium and potassium in clay, silt and fine sand fractions of some Finnish soils

Abstract: Samples of three layers of ten mineral soils were separated into the fractions

Cited by 7 publications

References 2 publications

Calcium, magnesium and potassium in mineral soils from the southern half of Finland

Calcium, magnesium and potassium in mineral soils from the southern half of Finland

Soil texture and organic matter prediction using Mehlich‐3 extractable nutrients

Leaching of plant nutrients from cultivated soils: I Leaching of cations

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