The Effect of drought occurring at different growth stages on productivity of grain amaranth Amaranthus cruentus G6
Grobelnik Mlakar, Silva ...
A greenhouse pot experiment was conducted to study the effect of drought induced at different phenological stages on growth, biomass production and yield performance of grain amaranth Amaranthus ...drought (W2) throughout the growing period, drought intiated at crop inflorescence formation (W3), drought condition during pre-inflorescence formation (W4) and treatment W5 were drought condition occurred in the period from the beginning of inflorescence formation to the beginning of flowering. Crop samples were takenat the maturity. The growth and yield performance of amaranth were assessed by measuring root lenght, stem height and inflorescence lenght, and by evaluating fresh and dry weight of plant parts, grain yield and harvest index. Drought stress initiated at different phenological stages affected the evaluated morphological parameters, assimilate allocation and grain yield. Drouhgt throughout the growing period resulted in grain and biomass yield reduction for 51 % and 50 %, respectively. Water deficit during inflorescence formation appears to be critical growing stage influencing grain yield, while soil drying in the vegetative growth stages improve the assimilate allocation to the above-ground biomass and particularly to the grain.
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