Acta Univ. Agric. Silvic. Mendelianae Brun. 2018, 66, 111-118

https://doi.org/10.11118/actaun201866010111
Published online 2018-02-28

Phosphorus Availability and Spring Barley Yields Under Graded P-Doses in a Pot Experiment

Gabriela Mühlbachová1, Pavel Čermák1, Radek Vavera1, Martin Káš1, Miroslava Pechová1, Kateřina Marková1, Jaroslav Hlušek2, Tomáš Lošák2

1Crop Research Institute, Drnovská 507/73, Prague 6, CZ-161 06, Czech Republic
2Mendel University in Brno, Faculty of Regional Development and International Studies, Zemědělská 1/1665, Brno CZ-613 00, Czech Republic

The pot experiment with graded P doses was carried out in 2015 and 2016 in the Crop Research Institute, Prague – Ruzyně (undermentioned CRI). Three soil types were chosen for the experiment – Chernozem, Cambisol, Haplic Luvisol. The soils were treated by graded P doses (0.3–0.6–1.2 g P/5 kg of soil). The soil without any treatment served as a control. The spring barley (variety KWS Irina) was grown up to the milky ripeness stage. Plants were regularly watered with the deionised water. Two-year results of experiments showed that the increase of spring barley dry matter was noted under graded P doses particularly in the year 2015, whereas in the year 2016 the plant growth despite to increasing trends generaly was not significant. The P-uptake by plants increased in correspondence to graded P doses and correlated with the P contents in soils determined by Mehlich 3 and NH4-acetate soil tests. The proportion of readily available P-NH4-acetate fractions increased in Chernozem and Luvisol in comparison with total available P-Mehlich 3 fractions under graded P doses. No evident increase of P-NH4-acetate fractions was obtained in Cambisol having the lowest CEC from all tested soils. The correlations between P content in plants of spring barley, P-uptake and phosphorus determined by Mehlich 3 and NH4‑acetate methods, with exception of relationship between P-barley and Mehlich 3, showed significant positive relationships. The highly positive relationship between P-Mehlich 3 and NH4-acetate methods indicating the suitability of both tests to predict phosphorus supply in soils.

Funding

The research was supported by grant of National Agency for Agricultural Research of Czech Republic no.: QJ 1530171.

References

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