Naslov
Phosphorus and potassium availability in hydromorphic soils of the Sava valley area in Croatia
(Phosphorus and potassium availability in hydromorphic soils of the Sava valley area in Croatia)

Autori
Petošić, Dragutin ; Kovačević, Vlado ; Kaučić, Dražen

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), stručni

Izvornik
Procedings, 2nd International Balkan agriculture congress / İstanbulluoğlu, Ahmet ; Önemli, Fadul - Tekirdağ : Namık Kemal University Faculty of Agriculture, Süleymanpaşa-Tekirdağ, 2017, 980-987

ISBN
978-605-4265-49-7

Skup
2nd International Balkan agriculture congress

Mjesto i datum
Tekirdağ, Turska, 16.05.2017. - 18.05.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
phosphorus availability ; potassium availability ; AL-method ; hydromorphic soils ; Croatia

Sažetak
In this study a part of agricultural land of eastern part of Sava valley area was covered. It is narrow belt longitude approximately 150 km and width form 5 to 10 km in west-eastern direction. Slobostina and Josava rivers are border toward west and east direction, respectively. Also, it is delimited by river Sava toward south and by Psunj, Pozeska gora and Dilj Mountains toward north. Unfavorable air-water relationships have been limiting factors of field crop yields in Croatia. Considerable increases of main arable crops yields were made by applied hydromelioration. However, retardation of growth and typical chlorosis as symptoms of either phosphorus (violet colouration of leaves) or potassium deficiencies (edge necrosis of leaves and inclination to lodging at maturity stage) were observed on some soils, mainly in maize crops. With aim of testing P and K availabilities, we analyzed a total of 480 soil profiles covering area of 31227 ha. Plant available P and K were determined by the Ammonium- Lactate method. P availability in the 0-30 cm of soil layer in about 30% of the tested agricultural land was very low P (until 5 mg P2O5 100 g-1 of soil), next 32% was in the range low P availability (from 5.1 to 10 mg), while only 17% has good or very good P availability (above 20 mg). Especially a high frequency of low P availability was found in vertic gley, amphygley and hypogley soils (28% tested agricultural land). Concerning the degree of K availability in the depth 0-30 cm nearly one third of the tested area was low supplied with potassium (less than 10 mg K2O/100 g of soil). Especially high frequency of this range of K availability is found in hypogley (near 50% of area covered by this soil type). The most favorable K status was found in semigley alluvial soils: only 7.7% of the area of this soil is moderate supplied with K and even 27.5% of the area is in range of very high K availability (above 25 mg K2O/100 g of soil).

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

Napomena
Rad je dostupan u Zborniku radova:
http://agribalkan2017.nku.edu.tr/ http://ziraat-
en.nku.edu.tr/

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