Physiological Response Of Onion To Water Stress And Bio Fertilizers

In this study, the results indicated that maximum marketable bulbs yield (t/fed), and the minimum total losses percentage in bulb yield are producing by irrigation at 24cb tensiometer reading (2328.38 m3 /fed) and fertilization with 75% from recommended NPK i.e. 75 kg N + 30 kg P2O5 + 18 kg K2O/fed plus spraying 1000 ppm Amino Total at three times or spraying 4000 ppm Soft Guard at three times. Irrigation at 36cb tensiometer reading (1097.70 m3/fed) and reducing mineral fertilization (NPK) by 25% with spraying 4000 ppm Soft Guard or 1000 ppm Amino Total for three times maximized water use efficiency by 41.11% and reducing total losses percentage in bulb yield after six months by 39.12% compared with irrigation at 24cb tensiometer reading (2328.38 m3 / fed) and fertilization with 100% NPK as an average in both seasons.

Autorentext

Ahmed A. Leilah, Assistant Lecturer, Agronomy department, Faculty of Agriculture, Mansoura University. Bachelor of Agricultural Science, Faculty of agriculture, Mansoura University, 2004. Ranked 1st with Honors. Master of Sciences in Agricultural Sciences (agronomy). Email: ahmedleila@mans.edu.eg.