Abstract
Water stress adversely affects plant productivity. Plant growth and curdproduction of cauliflower are limited under water stress. Hence, this research was anattempt to determine the effect of water regimes on cauliflower yield, enhance theproductivity in the sandy calcareous soils by using active dry yeast extract orpotassium humate and maximize of the water unite production. The cauliflowerplants have shown varying responses against water regimes, which was irrigationwith 80% of Reference Evapotranspiration (ETo) gives the highest values for allstudied parameters. Moreover, soil applications of active dry yeast extract orpotassium humate had the greatest stimulation effect on plant growth charactersunder different irrigation regimes (100%, 80% and 60% of ETo) in compared withcontrol. The results of the interaction revealed that the second irrigation (80% ofETo) plus adding active dry yeast extract or potassium humate to soil recorded thelargest curd diameter, biggest curd weight, and also the highest total yield ofcauliflower during 2014/2015 and 2015/2016 seasons, respectively.
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