The regulation of production process of spring barley by nitrogen application
1999
Candrakova, E. | Bakula, J. | Kulik, D. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic))
The effects of year, variety and nitrogen fertilization on the yield formation in spring barley were evaluated in field experiments carried out in the beet-growing district of Slovakia during 1997-1998. Differences in the process of the formation of yield components between four varieties of spring barley (Kompakt, Garant, Atribut and Expres) were estimated. The yield of grain was significantly dependent on a variety and interactions between year x variety and year x fertilization. The year influnced all yield components. In a 2-year average, the Expres variety produced the highest yield of grain (7.59 t/ha) whereas the Kompakt showed the lowest one (7.19 t/ha). The effects of the fertilization variants used significantly depended on the year conditions. In 1997, the lowest yield of grain was observed for the control variant, but in 1998, the lowest yield was found in the variants where ammonium nitrate was apllied at the growth stage, at the beginning of tillering. However, the foliar application of nitrogen, in the form of DAM-390, at the end of tillering increased grain yield. It is concluded that a number of grains per square m and higher accumulation of above-ground phytomass in the period of grain formation (heading stage - maturity) are the main factors for high yield production in spring barley. Higher values for above-ground phytomass had a substantial effect on a weight of 1,000 grains
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