Tag Archives: mineral fertilizers

xxx L. Hlisnikovský, P. Čermák, E. Kunzová and P. Barłóg
The effect of application of potassium, magnesium and sulphur on wheat and barley grain yield and protein content
Abstract |
Full text PDF (498 KB)

The effect of application of potassium, magnesium and sulphur on wheat and barley grain yield and protein content

L. Hlisnikovský¹*, P. Čermák¹, E. Kunzová¹ and P. Barłóg²

¹Department of nutrition management, Crop Research Institute, Drnovská 507, CZ16101 Prague 6, Ruzyně, Czech Republic
²Department of Agricultural Chemistry and Environmental Biogeochemistry, Poznan University of Life Sciences, Wojska Polskiego 71F, PL60-625 Poznan, Poland
*Correspondence: l.hlisnik@vurv.cz

Abstract:

The objective of our experiment was to study the effect of mineral fertilizers, rich mainly in the K, Mg and S content, and compare their effect on grain yield and protein content of winter wheat and winter barley with fertilizer treatments without these elements. The analyzed fertilizer treatments were 1) Control, 2) mineral nitrogen treatment (N), 3) mineral nitrogen with phosphorus (NP), 4) NP with potassium, magnesium, and sulphur (NP+KMgS), and 5) NP with magnesium, sulphur and minor part of manganese (4%) and zinc (1%) (NP+MgSMnZn). The experiment was established in Lukavec experimental station (the Czech Republic) in 2013 and lasted until 2017. The crop rotation consisted of four arable crops: winter wheat, winter barley, rapeseed, and potatoes, but only winter wheat and winter barley are analyzed in this paper (grain yields and crude protein content).
In comparison with the Control, the application of mineral fertilizers significantly increased grain yield and protein content of both kinds of cereal. Comparing mineral fertilizers, no significant differences were recorded between N, NP, NP+KMgS and NP+MgSMnZn treatments, showing that nitrogen was the most limiting factor affecting yield and protein content, and initial concentrations of K and Mg were suitable and capable to cover cereal’s demands. However, application of fertilizers has increased the K and Mg soil content and thus prevents the soil from the element’s deficiency, which does not has to be recognized in the early stages by visual observation of arable plants. The effect of the year was also significant as two out of four seasons were characterized by high temperatures and drought.

Key words:

, , , , , , ,




1613–1620 J. Hůla, M. Kroulík and I. Honzík
Critical velocity of solid mineral fertilizers in a vertical upward airstream and repose angle
Abstract |
Full text PDF (519 KB)

Critical velocity of solid mineral fertilizers in a vertical upward airstream and repose angle

J. Hůla*, M. Kroulík and I. Honzík

Czech University of Life Sciences Prague, Faculty of Engineering, Kamýcká 129, CZ165 21 Prague 6 – Suchdol, Czech Republic
*Correspondence: hula@tf.czu.cz

Abstract:

Critical velocity of mineral fertilizers in airstream is important not only at the application of fertilizers by spreaders but also at combine of fertilizing and sowing. The knowledge of angles of repose is important to design hoppers on spreaders for solid mineral fertilizers. Critical velocities for six solid mineral fertilizers were measured in the vertical aspiration duct of a laboratory sorting machine. Variation curves were constructed for particular fertilizers and the mean critical velocity of fertilizers (velocity of uplift) was computed. The mean critical velocity of fertilizers was between 8.53 and 12.43 m s-1. The lowest critical velocity was found out in the fertilizer UREA 46%, the highest in the fertilizer LAV. Statistical significance of differences in the critical velocity of fertilizers was assessed. Angles of repose of eight solid mineral fertilizers were also measured and statistical significance of differences was evaluated. The highest values of repose angle were determined for potassium salt and ammonium sulfate (35.9° respectively 34.9°), the lowest values for UREA and LAV (28.7° respectively 29.6°). The obtained results extend information applicable to an assessment of parameters of the operation quality of spreaders during mineral fertilizer application.

Key words:

, ,