|Authors: ||R.E. Abdelraouf, S.D. Abou-Hussein, M.A. Badr, N.M. El-Tohamy|
|Keywords: ||fish water effluent, nitrogen levels, onion, water use efficiency, agronomic efficiency|
Fish water effluent has great potential to improve agricultural crops.
The aim of this study was to evaluate benefits of fish water effluent (FW) as a source of bio-fertilizers coupled with different nitrogen (N) levels on yield, water use efficiency (WUE) and agronomic efficiency of N (AEN) for sprinkler irrigated onion grown on sandy soil.
Nitrogen treatments were, 0 (N0), 20 (N20), 40 (N40), 60 (N60) and 80% (N80), kg N ha-1 of recommended dose.
The combined treatments were termed as FWN0, FWN20, FWN40, FWN60, FWN80, respectively.
This was done along with application of 100% (N100) of recommended dose applied from mineral source.
FW coupled with different N levels was fertigated periodically from fish ponds via sprinkler irrigation during the whole season of onion.
FW coupled with N at 80% of recommended dose (FWN80) gave comparable yield to N100 in the first year while higher yield was obtained in the second year.
Similarly, the value of WUE and AEN under FWN80 was as high as their corresponding value under N100 in the first year but the both values were appreciably higher in the second year.
These results indicate to the benefits of fish water effluent and the validity and possibility of sustained agronomic performance of onion yield besides reducing 20% of N fertilizer cost.
Download Adobe Acrobat Reader (free software to read PDF files)