Abstract
Purpose. To investigate the influence of different types of mineral nutrition on the spring barley plants height formation and indicators of average daily linear growth after different precursor crops. Methods. Study of the action and interaction of factors: A – precursor; B – levels of mineral nutrition. Gradation of factors 3x3. Threefold repetition of the experiment with the systematic placement of variants was used. The accounting area made up 30 m2 . Precursor crops for spring barley were winter rapeseed, grain corn, sunflower. Soil preparation in the pre-sowing period depended on the precursor crop and was aimed at maximum preservation and accumulation of moisture in the soil and destruction of weeds. Results. The formation of spring barley plant height dynamics under the influence of different levels of mineral nutrition taking into account the precursor crop is highlighted. It was established that the use of N90P60K60 contributed to the intensive growth of spring barley. Growing spring barley after sunflower without fertilizer made it possible to obtain plant height in the phase of full maturity at the level of 50 cm. Application of mineral fertilizers at the rate of N60P60K60 allowed to increase the height parameters to 55 cm, while application of N90P60K60 – to 63 cm. Analysis of average daily linear growth of spring barley plants during the growing season proved the significant influence of the levels of mineral nutrition on the process of growth. The lowest rates of growth were in the variant without fertilizers – 0.60-0.63 cm/day, while with N60P60K60 – 0.63-0.67 cm/day. The highest rates of average daily linear growth were noted under mineral fertilizing with N90P60K60, and depending on the precursor crop, they were 0.70-0.71 cm/day. Conclusions. The positive role of mineral fertilizers, in particular nitrogen fertilizers, in the formation of high growth rates, starting from the tubing phase till the harvesting ripeness one, has been established. The highest height indicators, 63-67 cm, were confirmed by the measurements carried out in the phase of full ripeness on the variants with N90P60K60 use.
Publisher
Publishing House of National Academy Agrarian Sciences of Ukraine
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