Potassium-Fixing Clay Minerals as Parameters that Define K Availability of K-Deficient Soils Assessed with a Modified Mitscherlich Equation Model

Bilias, Fotis; Barbayiannis, Nikolaos

doi:10.1007/s42729-019-00082-3

Cited by 17 publications

(10 citation statements)

References 38 publications

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“…Determination of soil available phosphorus was performed according to Lu et al [34]. We measured soil available potassium by flame photometry method with NH 4 OAc extraction [35]. The pH was measured in an aqueous soil extract in deionized water (1:5 soils: water) [32].…”

Section: Collection and Analysis Of Soil Samples And Potato Tuber Sammentioning

confidence: 99%

The Correlation between Soil Nutrient and Potato Quality in Loess Plateau of China Based on PLSR

et al. 2020

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Potato tuber quality is influenced by the interaction of soil nutrients. Hence, simple correlation analysis cannot accurately reflect the true relationship between soil nutrients and potato tuber quality. In this study, potato tuber quality and soil nutrient content were used as research materials in the Loess Plateau of China. The partial least square regression (PLSR) method was used to establish the regression equation between potato quality and soil nutrient. The major soil nutrient indexes influencing potato quality were screened out to provide theoretical basis for potato field management. The results showed that the major soil nutrient factors influencing the potato tuber quality in Loess Plateau were soil ammonium nitrogen, soil nitrate nitrogen, soil available phosphorus, pH, and soil available potassium. Soil pH value is the most important factor affecting potato starch, reducing sugar content, and soluble protein content. Soil nitrate nitrogen is one of the important factors affecting potato tuber soluble total sugar content, vitamin C, browning intensity, and polyphenol oxidase activity. Soil ammonium nitrogen was positively correlated with the total soluble sugar content of potato tubers, and negatively correlated with reducing sugar content, browning intensity, and polyphenol oxidase activity. However, soil available potassium has positive effects on potato starch and reducing sugar content, and negative effects on soluble protein and browning strength. Results of this study indicates that the major soil nutrient factors influencing potato tuber quality were soil nitrate nitrogen and soil pH value.

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Section: Collection and Analysis Of Soil Samples And Potato Tuber Sammentioning

confidence: 99%

The Correlation between Soil Nutrient and Potato Quality in Loess Plateau of China Based on PLSR

et al. 2020

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“…This nutrient functions to maintain the vigor of potato plants, positively affecting shoot growth, dry matter (DM) accumulation, and the duration of tuber bulking, with consequent effects on tuber yield and quality (Allison et al 2001;Khan et al 2012;Moinuddin et al 2005). However, the management of K fertilization in potato crops is difficult because in addition to adjusting the optimum K rate considering the initial availability of this nutrient in the soil, it is also necessary to establish the most appropriate application timing of K fertilizer (Bilias and Barbayiannis 2019).…”

Section: Introductionmentioning

confidence: 99%

Biomass Accumulation and Nutritional Requirements of Potato as Affected by Potassium Supply

Soratto

Job

Fernandes

et al. 2020

J Soil Sci Plant Nutr

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Potassium (K) supply affects the growth and tuber yield of potato (Solanum tuberosum L.) as well as the uptake and removal of certain nutrients. However, information on this is scarce or inconsistent. Thus, this study was undertaken to evaluate the dry matter (DM) accumulation and the uptake and removal of nutrients by potato 'Agata' as affected by K fertilizer management (rates and application timings) in tropical clay soils with varied K availability. In soils with low K availability, K fertilization increased (P ≤ 0.05) the biomass of potato plants without differences among management types; however, in soils with medium and high K availability, K fertilizer did not alter the plant DM accumulation. K fertilization increased (P ≤ 0.05) N, K, Ca, Mg, S, B, Mn, and Zn uptake and removal in the soil with low K availability, while in soils with medium and high K availability, K fertilization had less influence on the uptake and removal of nutrients, except that K uptake and removal increased (P ≤ 0.05) under K fertilization, evidencing luxury uptake. In the soil with medium K availability, K application reduced (P ≤ 0.05) Mg uptake by plants, but this effect was not observed in soils with high K availability. Mn uptake and removal increased (P ≤ 0.05) under K fertilization in soils with low and high K availability. The increases in the uptake and removal of almost all nutrients in response to K fertilization were related to the increase in plant DM accumulation, but changes in the concentrations of K and some other nutrients also contributed to their increased uptake and removal.

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“…The latter might be attributed on the fact that such concentration corresponds to the upper range of soil solution K that mainly occurs in most agricultural soils under common cultivation practices (1-10 mg L −1 K) (Halvin et al 2014), and thus it could reflect more accurately both K dynamics, as well as the K-Ca equilibria (Hernández-Pérez et al 2020). In addition, the above relationships were further improved when CEC was included as part of the dependent variable, especially for the -ΔΚ 0 prediction, indicating the key role that CEC plays in expressing the competitive relationship of K with the rest of the exchangeable cations of soil solid phase (Bilias and Barbayiannis 2019b). Correlation analysis between predicted values of -ΔΚ 0 and AR e K parameters of K-depleted soils derived from equations of Table 3b and corresponding values obtained from Table 1 reveal the effect of K depletion on the single-point Q/I parameters' prediction accuracy.…”

Section: Discussionmentioning

confidence: 98%

Towards a Single-Point Approach for Estimating Potassium Quantity-Intensity Parameters in Soils at Different K Saturation Ratios

Bilias

Barbayiannis

2020

J Soil Sci Plant Nutr

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The objective of this study was to obtain sufficient estimates of quantity-intensity (Q/I) parameters using a single-point method, and to evaluate the role of cation exchange capacity (CEC) and Gapon selectivity coefficient (K G ) as parameters that improve prediction model's estimation accuracy or explain its limitations under conditions of K deficiency. Regression models were applied on raw data derived from previews Q/I experiments conducted on 20 soils of northern Greece at initial and K-depleted treatment states. Relationships between soil K adsorbed or released (ΔΚ), or K activity ratios at each K addition (AR K ) and respective values at equilibria (-ΔΚ 0 , AR e K ) were tested to find the best fitting models. CEC was included in regression models to improve their performance, while K G parameter was assessed for initial and K-depleted soils. The study showed that Q/I parameters were well predicted with the single-point method for a wide range of K saturation ratios, by applying 0.01 M CaCl 2 and 10 mg L −1 K addition. Furthermore, CEC significantly improved model's estimation accuracy. Under the ΔG breakpoint of − 14.67 kJ mol −1 , specific adsorption sites of the soil inner-sphere region weaken the single-point prediction efficacy, as was clearly indicated by the K G formation under conditions of K depletion. The study suggests that the proposed method is applicable for estimating Q/I parameters for soils covering a wide range of K activity ratios. Moreover, CEC and K G parameters constitute useful tools in improving prediction model's estimation accuracy, or explaining their limitations under conditions of K deficiency.

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Potassium-Fixing Clay Minerals as Parameters that Define K Availability of K-Deficient Soils Assessed with a Modified Mitscherlich Equation Model

Cited by 17 publications

References 38 publications

The Correlation between Soil Nutrient and Potato Quality in Loess Plateau of China Based on PLSR

The Correlation between Soil Nutrient and Potato Quality in Loess Plateau of China Based on PLSR

Biomass Accumulation and Nutritional Requirements of Potato as Affected by Potassium Supply

Towards a Single-Point Approach for Estimating Potassium Quantity-Intensity Parameters in Soils at Different K Saturation Ratios

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