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Browsing Archive by Author "Bijelić, Z."

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    Response of Italian ryegrass seed crop to nitrogen fertilization and trinexapac-ethyl application.
    (University of Banja Luka Faculty of Agriculture, 2020-09-24) Jovanović-Radovanov, K.; Simić, A.; Radivojević, M.; Mandić, V.; Bijelić, Z.; Sokolović, Dejan; Babić, Snežana
    Italian ryegrass (Lolium multiflorum Lam) is prone to lodging as consequence of high precipitation levels during growth period, and/or high nitrogen fertilizers application rates in spring. The aims of the studies were to determine the possible changes of Italian ryegrass growth in the first production year using different nitrogen spring application rates and growth regulator doses. Field trials were conducted during two consecutive years under no irrigation conditions. Tetraploid Italian ryegrass cv. K-29 was seeded each autumn with seedling rate of 20 kg ha–1 and fertilizer addition (NPK 8:16:24) 250kg ha-1 . Three rates of nitrogen (0, 50 and 100 kg ha-1 ) were applied at early spring, and somewhat later three doses (0, 0.5 and 1 L ha−1 ) of growth regulator trinexapac-ethyl. Trials were set as complete randomized block design with four replications and plot size of 10 m2 . Prior to the seed harvest, biometrical traits such as number of generative tillers, internodes’ length, stem length, spike length and the number of spikelets per spike were measured on 10 randomly sampled tillers from each plot. Due to different precipitation levels (relatively low in the first and relatively high in the second year of examination) there was significantly different effect of trinexapacethyl on Italian ryegrass. All morphological parameters measured except 5th internodes’ length and spikelet number were statistically significantly different from control in the first year while the only difference was evident for the 4th internodes’ length in the second year. As for nitrogen application there were significantly differences in 5th and 6 th internodes’ length as well as in tiller and spike length in the first year but only in regard to tiller length in the second year. The opposite effect of those treatments could be useful for optimizing Italian ryegrass seed production in Serbian environmental conditions.