Effect of drought stress on the formation of yield elements in spring barley and the potential of stress expression reduction by foliar application of fertilizers and growth stimulator
Svobodova, I.(Zemedelsky Vyzkumny Ustav, Kromeriz (Czech Republic))E-mail:[email protected] | Misa, P.(Zemedelsky Vyzkumny Ustav, Kromeriz (Czech Republic))
Spring barley plants were exposed to water stress at different growth stages as follows: 1) from the period after emergence to the beginning of stem elongation, 2) from emergence to the end of anthesis, 3) from the beginning of stem elongation to the end of anthesis in pot experiments. The effects of foliar fertilizers and Atonik preparation (applied before the growth stage DC 30 or at DC 33) were tested in variants exposed to water deficit from emergence to the end of anthesis and from the beginning of stem elongation to the end of anthesis. During the growing season, formation and reduction of tillers, florets per spike and the yield structure at full ripeness were investigated. The water deficit at stem elongation caused a withering of the established tillers, drought during the formation of the florets reduced their number as well as their development into grains. In the variant under water stress till the beginning of stem elongation, the plants were able to compensate for stress implications by productive tillers that developed later (at stem elongation). The previous water deficit did not decrease the thousand grain weight, however protein content in grain increased due to the low grain yield per pot. If foliar fertilizers and Atonik were applied before DC 30, a reduction of fertile florets decreased, which led to slight increase in grain number per spike.
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