Root system size of alfalfa varieties under different plant densities
2012
Al-Mosanif, E., Mendelova Univ., Brno (Czech Republic). Ustav Pestovani, Slechteni Rostlin a Rostlinolekarstvi | Vejrazka, K., Vyzkumny Ustav Picninarsky, Troubsko (Czech Republic) | Juzl, M., Mendelova Univ., Brno (Czech Republic). Ustav Pestovani, Slechteni Rostlin a Rostlinolekarstvi | Drapal, K., Mendelova Univ., Brno (Czech Republic). Ustav Pestovani, Slechteni Rostlin a Rostlinolekarstvi
A field experiment was established from pre-grown alfalfa sprouts in 2008. Plants were harvested in 2009 and 2010. Yields and the size of root systems (RSS) were evaluated in the total of five cuts. Two localities of diverse soil and weather conditions, Zabcice and Troubsko, were selected. Zabcice is a dry location with a highly permeable sandy soil layer, but at the same time with a considerable fluctuation of the underground water level; Troubsko, on the other hand, represented a location with a higher content of clay in soil suitable for growing alfalfa. The trial was established in two types of plant spacing, 25 x 25 cm (16 plants per square m) and 50 x 50 cm (4 plants per square m). Two alfalfa varieties were used, Hodoninka (an old variety) and Oslava (a new variety). The following factors were evaluated by statistical means: location, variety, plant spacing, and cut number. The effect of location on the aboveground phytomass and the RSS value were statistically significant. The higher average values of aboveground phytomass as well as RSS were achieved on the Troubsko location where the aboveground phytomass was 19.57 t/ha and RSS was 2.71 nanofarad (nF). The impact of the variety was highly significant only in respect to RSS. Higher average RSS values were reached by the Hodoninka variety (2.59 nF) than by the Oslava variety. The effect of the plant spacing on both the aboveground phytomass and the RSS values was highly significant. Higher average aboveground phytomass was achieved when the 25 x 25 cm plant spacing was employed (18.64 t/ha), higher RSS value was reached when the plant spacing was 50 x 50 cm (2.99 nF). The impact of the cut number on both the aboveground phytomass and the RSS was highly significant. The highest average aboveground phytomass and RSS were measured in the third cut. The aboveground phytomass was 30.36 t/ha and RSS was 3.86 nF.
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