Žieminių kviečių grūdų kokybinių rodiklių priklausomumas nuo tręšimo azoto trąšomis. (Lithuanian)

THE DEPENDENCE OF QUALITY INDICATORS OF WINTER WHEAT GRAIN ON FERTILISATION WITH NITROGEN FERTILISERS. (English)

The paper investigates the dependence of quality indicators of winter wheat grain on fertilisation with nitrogen fertilisers. The field experiment was conducted at the Experimental Station of Aleksandras Stulginskis University in the carbonate shallow gleyic leached soil Calc(ar)i-Epihypogleyic Luvisol in the period between 2011 and 2012. In the research, the wheat cultivars with very good baking qualities, 'Zentos' and 'Ada', were assessed. Granular superphosphate (P60) and potassium chloride (K60) fertilisers were spread during sowing, while ammonium nitrate (N60) in spring, in the tillering time (BBCH 23-25), after the vegetation had resumed. Additionally, the plants were treated with the foliar fertilizer urea solution: (N30), (N40) at the booting stage (BBCH 34-36) and (N15), (N30) at the milk ripening stage (BBCH 71-74). It has been established that the application of nitrogen fertilisers at booting and milk ripening stages improved the protein content in 'Zentos' and 'Ada' wheat grain on the average by 2.20-1.76 percentage points, the wet gluten content by 4.89-4.66 percentage points and sedimentation values by 12.58-14.20 ml. The correlation and regression analysis of the data has verified that there is a statistically significant correlation between quality indicators of wheat grain and nitrogen fertiliser application rates. The correlation received was very strong (r = 0.902- 0.922 and r = 0.883-0.927). [ABSTRACT FROM AUTHOR]

Darbe tirtas žieminių kviečių kokybinių rodiklių priklausomumas nuo tręšimo azoto trąšomis. Lauko eksperimentas vykdytas 2011-2012 m. Aleksandro Stulginskio universiteto Bandymų stotyje, karbonatingame sekliai glėjiškame išplautžemyje (Calc(ar)i-Epihypogleyic Luvisol). Vertintos labai geras kepamąsias savybes turinčios kviečių veislės: 'Zentos', 'Ada'. Granuliuoto superfosfato (P60) ir kalio chlorido (K60) trąšos išbertos sėjos metu, o amonio salietra (N60) - pavasarį, atsinaujinus vegetacijai, krūmijimosi tarpsniu (BBCH 23-25). Papildomai per lapus tręšta karbamido tirpalu: (N30), (N40) - bamblėjimo (BBCH 34-36) ir (N15), (N30) - pieninės brandos (BBCH 71-74) tarpsniais. Nustatyta, kad azoto trąšų naudojimas bamblėjimo ir pieninės brandos tarpsniais veislių 'Zentos' ir 'Ada' kviečių grūdų baltymingumą pagerino vidutiniškai 2,20-1,76 proc. vnt., šlapiojo glitimo kiekį - 4,89-4,66 proc. vnt., sedimentacijos vertes - 12,58- 14,20 ml. Atlikta koreliacinė regresinė duomenų analizė patvirtino, kad kviečių grūdų kokybės rodikliai statistiškai patikimai koreliavo su azoto trąšų normomis. Koreliaciniai ryšiai gauti labai stiprūs (r = 0,902-0,922 ir r = 0,883-0,927). [ABSTRACT FROM AUTHOR]

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