Fotosintezės produktyvumas skirtingų veislių žieminių kviečių lapuose

Abstract

The key objective of the research is the comparison of the fertility rate, leaf area index and dry matter content of different varieties of winter wheat (Triticum aestivum L.). The field research was performed at Experimental Station of Aleksandras Stulginskis University in 2017–2018. Prior to the experiment, the arable layer of the soil was alkaline – pH 7.4, with the medium humus content (2.22 percent), high phosphorus content (230 mg kg-1) and medium potassium content (116 mg/kg). Object of the research – varieties of winter wheat: ‘Ostroga’, ‘Hondia’, ‘Arkadia’, ‘Skagen’ and ‘Julius’. The experiment was performed in four repeating cycles. The repeating cycles were randomised. Seedtime – the 14th of September. Preceding crop – black fallow. In the spring, during the vegetation period (on the 28th of March), the soil was fertilised with ammonium saltpeter (N20). Afterwards, on the 12th of April, the soil was fertilised with ammonium saltpeter N51, and on the 26th of April, with N68. The highest leaf area index (4.31) and dry matter content (1680.76 g m-2) were established of the winter wheat varieties ‘Arkadia’ and ‘Ostroga’ in the stem elongation stage compared with to the average of the varieties studied. Over the experimental period, the yield of different varieties of winter wheat changed slightly compared with to the average yield. The highest crop yield (8.45 t ha-1) and the yield supplement (0.83 t ha-1) was established ‘Hondia’ wheat variety compared with to the ‘Ostroga’ winter wheat yield.