DETERMINATION OF K QUANTITY- INTENSITY PARAMETERS IN A TOPOSEQUENCE

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HASHEMIMOFRAD S.M.; HOSSEINPUR A.R.; MOTAGHIAN H.R.

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Journal: Journal of Water and Soil Conservation Year:2017 | Volume:24 | Issue:3 Page(s): 267-282

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Title

DETERMINATION OF K QUANTITY- INTENSITY PARAMETERS IN A TOPOSEQUENCE

Author(s)

HASHEMIMOFRAD S.M. | HOSSEINPUR A.R. | MOTAGHIAN H.R. | Issue Writer Certificate

Keywords

POTASSIUM FORMSQ1

QUANTITY-INTENSITY PARAMETERSQ1

TOPOGRAPHYQ2

Abstract

Background and Objectives: Spatial variability of soil properties is related to environmental factors such as climate, slope position, TOPOGRAPHY, slope gradient, elevation, parent material and vegetation. TOPOGRAPHY variability and soil formation cause the significant differences in soil characteristics in a hillslope. TOPOGRAPHY affects the amount of nutrients, including potassium (K) in the soil. Therefore, knowledge of variability in soil K availability to achieve better production and sustainable management is essential. The relationship of quantityintensity (Q/I) offers a relatively full of soil K status. The present study was to evaluate the effect of TOPOGRAPHY on K quantity- intensity parameters using the six horizons in both depths on a sequence in Shahrekord plain.Materials and Methods: Soil samples were air dried, to pass a 2 mm sieve and then, selected physical and chemical properties of soil were measured by laboratory standard methods. In these samples Q/I parameters including activity ratio at equilibrium (AR0), labile K (DK0), potential buffering capacity (PBCK) and hardly exchangeable K (Kx) also K forms were determined.Results: The results showed that the effect of TOPOGRAPHY on K quantity- intensity parameters in both depths was significant (P<0.05). The K activity ratio in the surface soils ranged from 0.012-0.057 (mmol L-1) 0.5. The labile K surface soil ranged from 1.46-0.34 (mmol kg-1). K potential buffering capacity was 36.79-22.54 (mmol kg-1) / (mmol L-1) 0.5 in the surface horizons. The hardly exchangeable K (Kx) varied in soils surface 2.39-0.10 (mmol kg-1). In soils located on the lower slope, the amount DK0 (0.90-1.46 mmol kg-1) and AR0 (0.035-0.055 mmol L-1) 0.5 higher than the soil located at upper slope (DK0 in the range of 0.34-0.53 (mmol kg-1) and AR0 with a range of 0.011-0.014 mmol L-1) 0.5, respectively. But PBCK and AR0 have different values at different slopes. Study the correlation between Q/I parameters and soil properties suggested that correlation was observed between AR0 with organic carbon in surface layers (r=0.74**), CEC (r=0.78**) and clay (r=0.62**). Correlation between ΔK0 and CEC (r=0.80**) and clay (r=0.66**) was also significant. In subsoil horizon significant correlation was found between PBCK with CEC (r=0.56*) and clay (r=0.70**); between DK0 with exchangeable K (r=0.83**) and organic carbon (r=0.89**).Conclusion: The results showed that TOPOGRAPHY caused changes in the soil properties, especially clay, organic carbon and CEC, therefore, can affect the quantity-intensity potassium.

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APA: Copy

HASHEMIMOFRAD, S.M., HOSSEINPUR, A.R., & MOTAGHIAN, H.R.. (2017). DETERMINATION OF K QUANTITY- INTENSITY PARAMETERS IN A TOPOSEQUENCE. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 24(3), 267-282. SID. https://sid.ir/paper/156144/en

Vancouver: Copy

HASHEMIMOFRAD S.M., HOSSEINPUR A.R., MOTAGHIAN H.R.. DETERMINATION OF K QUANTITY- INTENSITY PARAMETERS IN A TOPOSEQUENCE. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2017;24(3):267-282. Available from: https://sid.ir/paper/156144/en

IEEE: Copy

S.M. HASHEMIMOFRAD, A.R. HOSSEINPUR, and H.R. MOTAGHIAN, “DETERMINATION OF K QUANTITY- INTENSITY PARAMETERS IN A TOPOSEQUENCE,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 24, no. 3, pp. 267–282, 2017, [Online]. Available: https://sid.ir/paper/156144/en

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