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The potential of organic phosphorus in acidic soils of eastern Slavonia (CROSBI ID 632335)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Popović, Brigita ; Lončarić, Zdenko ; Karalić, Krunoslav ; Semialjac, Zoran ; Pećar, Nina The potential of organic phosphorus in acidic soils of eastern Slavonia // Proceedings of the 9th International Symposium on Plant-Soil Interactions at Low pH / Lončarić, Zdenko ; Kochian, Leon (ur.). Osijek: Poljoprivredni fakultet Sveučilišta Josipa Jurja Strossmayera u Osijeku, 2015. str. 37-37

Podaci o odgovornosti

Popović, Brigita ; Lončarić, Zdenko ; Karalić, Krunoslav ; Semialjac, Zoran ; Pećar, Nina

engleski

The potential of organic phosphorus in acidic soils of eastern Slavonia

Phosphorus is often sparingly soluble in soils and, consequently, P deficiency in plants represents a major constraint to world agricultural production. Plants possess many potential mechanisms to increase P uptake from soil, including an upregulation of P membrane transport systems, the increased growth of root hairs, enhanced mycorrhizal association, the release of phosphatases, changes in root architecture and the release of organic acids. The concentrations of plant available phosphorus in soil is closely connected with the chemical properties of the soil, basically soil pH. In fact, the relationship of fractions of inorganic phosphorus in the soil depends primarily on the pH and, in acidic soils (especially in pHKCl <5, 5), the dominant ions are iron and aluminum, which easily enter into chemical reactions with phosphate ions in the soil and form Al-Fe-phosphates, which are generally plant unavailable forms. In such acidic soils, organic phosphorus has a great potential for plant nutrition. Organic phosphorus in soil is part of more than 50% of total phosphorus, mostly in the form of inositol penta- and hexa- phosphate bound in iron and aluminum. Phosphatase enzyme activity in the soil is crucial for organic phosphorus availability, because most plants can adopt phosphorus exclusively in inorganic form. The organic phosphorus can be released through mineralization processes mediated by soil organisms and plant roots in association with phosphatase secretion. These processes are highly influenced by soil moisture, temperature, surface physical-chemical properties, soil pH and Eh (for redox potential). Also, the amount of organic phosphorus in the soil is closely related to the organic matter content in soil. So, the aim of paper was to determine the potential of organic phosphorus in acidic soils of eastern Slavonia due to the organic matter content, as well as total and mineral phosphorus concentrations in the soil. Soil samples (n=40) were taken from the field of eastern Slavonija (0-30 cm) and laboratory analysis of the common soil chemical properties were determined: the soil pH (ISO 10390, 1994), the content of organic matter in the soil by dichromate method (ISO 14235, 1994), the concentration of AL- available phosphorus and potassium (Egner et al., 1960). The organic phosphorus in the soil was determined by three step extraction and three fractions of phosphorus were determined: mineral phosphorus obtained by extraction (labile, unstable medium, the humic acids), total phosphorus obtained by digestion (labile, medium labile phosphorus in humic acids) and organic phosphorus (labile, medium labile phosphorus in humic acids). The results of soil samples analyzes were statistically analyzed with PC applications SA for Windows (SAS Institute Inc., Cary, NC, USA), StatSoft Statistica and Excel for determination of analysis of variance (ANOVA) and correlation. Results of actual acidity pHH2O were ranged from 5, 10 to 6, 69 and substitutional acidity pHKCl from 3, 88 to 5, 92 which indicating a range of weak acid to very acid soils in the analyzed samples. Furthermore, the results of AL-phosphorus concentration were from 23, 33 to 95, 42 mg P2O5 100g-1 of soil. The AL- potassium concentrations were in the range of 16, 62 to 36, 81 mg K2O 100g-1 soil. The organic matter content in acidic soils was from 2, 17 to 3, 30 %. The extraction of organic phosphorus (stable, bound phosphorus) were within the range of 320, 75 mg/kg to 579, 50 mg/kg with an average of 419, 15 mg/kg. It actually represents the organic fraction of the soil obtained the in humic acids. In acidic soils of eastern Slavonia were, also, established the concentrations of total phosphorus in soil (ranged from 511, 00 mg/kg to 766, 50 mg/kg average 647, 40 mg/kg), as well as mineral phosphorus fraction concentration which was ranged from 163, 75 mg/kg to 375, 00 mg/kg with average 228, 25 mg/kg. This concentrations represent labile fraction phosphorus in soil (potentially more plant available forms in soils) and were used for calculated the ratio of mineral/total phosphorus and organic/total phosphorus in soil which was 35 % for mineral fraction in total phosphorus and 64, 74 % for organic fraction in acid soils. So, compared to mineral labile fraction, in acidic soils were established higher concentration and potential of organic phosphorus, regardless of the content of organic matter in soil. Also, between total and organic phosphorus was found a high correlation, r = 0.98. Although the correlations between organic phosphorus and organic matter content were not determined, results can be used to create a model for predicting the organic phosphorus concentrations in soil, based on common soil properties, as well as for correction of fertilizer recommendations based on the AL methods. Furthermore, the obtained results can be used for further analysis, to study the influence of organic matter content and available mineral phosphorus to the organic fraction of phosphorus regardless to pH.

organic phosphorus ; soil pH ; fertilization ; eastern Croatia ; AL method

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Podaci o prilogu

37-37.

2015.

nije evidentirano

objavljeno

978-953-7871-40-6

Podaci o matičnoj publikaciji

Proceedings of the 9th International Symposium on Plant-Soil Interactions at Low pH

Lončarić, Zdenko ; Kochian, Leon

Osijek: Poljoprivredni fakultet Sveučilišta Josipa Jurja Strossmayera u Osijeku

Podaci o skupu

9th International symposium on Plant-Soil Interactions at Low pH

poster

18.10.2015-23.10.2015

Dubrovnik, Hrvatska

Povezanost rada

Poljoprivreda (agronomija)