الفهرس 
REVIEW OF LITERATURESOnly 14 pages are availabe for public view
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Abstract
SUMMARY AND CONCLUSIONS
Fertigation technique is widely used in Mediterranean basin countries where nutrients are injected through irrigation water in concentrations meeting the actual plant requirement. Effective fertigation management requires a highly qualitative database to achieve the maximum profit of either yield production or conserving agricultural and physical resources for sustainable agriculture and minimizing potential negative impacts on either irrigation system efficiency or environmental and human hazards.
A. Objectives of this study were:
1. Build, verify and validate a simulation model for managing fertigation of potato crop under Egyptian conditions.
2. Improve yield production for potato crop via maximizing fertigation management efficiency using simulation models.
B. The material and methods used in this work can be summarized as following:
1. A simulation model named Fertigation Mag-SM (Fertigation Management Simulation Model) was coded and compiled using Microsoft visual basic 2013. The study presented the proposed model with its components, the built up reference information (location information, soil properties, climatic data, crop data, and irrigation and fertilizing options) and all equations as well as rules used for estimating fertigation management parameters.
2. The Fertigation Mag-SM simulation model was validated by carrying out a field experiment at the Experimental Farm of Agricultural Production and Research Station (APRS), National Research Centre (NRC), El Nubaria District, El-Behaira Governorate, Egypt for a growing season of 2015, 2016. A solid set sprinkler irrigation system was set up to apply the fertigation needs to the plants precisely and at the proper time.
The experiment included the following factors:
• Estimating crop evapotranspiration,
• Estimating Irrigation and fertilizers requirements,
• Irrigation systems (Solid set sprinkler irrigation system) and
• One vegetable crop (Potato).
The obtained results showed that:
1. The estimation of irrigation requirements for each crop is more accurate than the followed by the conventional control system.
2. The fertigation scheduling estimated by Fertigation Mag-SM model is more accurate than the scheduling used by the conventional control.
3. Yield: the highest yields of potato at 75% of FI and 100% of NPK were (14.05 ton fed-1) based on simulated water and fertilizers using Fertigation Mag-SM and (13.21 ton fed-1) using the conventional control during season 2015 and Were (14.5 ton fed-1) based on simulated water and fertilizers using Fertigation Mag-SM and (13.78 ton fed-1) using the conventional control during season 2016 whereas the lowest yield of potato at 50% of FI and 50% of NPK were (7.56 ton fed-1 ) based on simulated water and fertilizers using Fertigation Mag-SM and (7.25 ton fed-1 ) using the conventional control in season 2015, and were(8.46 ton fed-1 ) based on simulated water and fertilizers using Fertigation Mag-SM and (8.13 ton fed-1 ) using the conventional control in season 2016.
4. Water use efficiency: maximum value of WUE for potato was at 75% of FI and 100% of NPK (5.77 Kg m-3) based on simulated water and fertilizers using Fertigation Mag-SM and (5.14 Kg m-3) using the conventional control in season 2015 and were 6.02 Kg m-3) based on simulated water and fertilizers using Fertigation Mag-SM and (6.77 Kg m-3) using the conventional control in season 2016.
5. Fertilizers use efficiency: Maximum value for FUE for potato was at 75% of FI and 50% of NPK, as NUE (268.9 Kg Kg-1), PUE (372.3 Kg Kg-1) and KUE (169.8 Kg Kg-1) based on simulated water and fertilizers and were NUE (242.0 Kg Kg-1) PUE (372.3 Kg Kg-1) and KUE (161.3 Kg Kg-1) using the conventional control in season 2015, and were NUE (274.5 Kg Kg-1), PUE (417.2 Kg Kg-1) and KUE (183 Kg Kg-1) based on simulated water and fertilizers and were NUE (260.8 Kg Kg-1) PUE (401.2 Kg Kg-1) and KUE (173.8 Kg Kg-1) using the conventional control in season 2016.
The recommendations of this study:
1. The suggested simulation model is able to estimate and manage fertigation technique precisely and work effectively in all conditions in Egypt.
2. The precise estimation of fertigation requirements can maximize yield and improve water and fertilizer use efficiency under any conditions.