الفهرس 
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Abstract
to design a fertigation program using the expert system (ES).To achieve the objective of this study, the following steps were required:
i. Identification of the problem
ii. Analysis of the information
iii. Characterizing the variables of the key factors and qualifiers.
The study involved also a comparison between the ES program outputs and the corresponding ones recommended by the Ministry of Agriculture. To establish such a comparative study, a field experiment was executed on bean plant after dividing the field of study into two sections. In the first, the experimental work was carried out using the ES fertigation management, while in the second section, the well-known “CROPWAT Program”, was used for the scheduling of the irrigation together with the traditional methods of fertigation outlined by the Ministry of Agriculture, Egypt.
Results of this study could be summarized as the following:
1. In July, the evapotranspiration by OA-Fertigation program depending FAO-Penman-Monteith (PM) decreased by 21.6%, 24.7% and 19.8% for HG, CROPWAT and CLAC, respectively.
2. Data analyses showed that, the agreement between the OA-Fertigation program depending on Penman-Monteith equation (PM) and Hargrives equation (HG) was 96.29% (Figure 4.13).
3. Data analyses showed that, the agreement between the OA-Fertigation program depending on Penman-Monteith equation (PM) and CROPWAT was 98.07% (Figure 4.14)
4. Data analyses showed that, the agreement between the OA-Fertigation program depending on FAO-Penman-Monteith equation (PM) and CLAC method was 91.3% (Figure 4.15).
5. Regression analyses were carried out to evaluate the results of water requirement under various methods. They show the agreement between the OA-Fertigation program and CROPWAT was 96.05% under drip irrigation and subdrip irrigation systems (Figure 4.17).
6. Data analyses showed that, the agreement between the OA-Fertigation program and CROPWAT program was 83.21% under furrow irrigation (Figure 4.18).
7. Data analysis for bean crop showed that, in mid stage, the water requirement determined by OA-Fertigation program decreased by 61.76 %, 61.76 and 67.4% as compared to the corresponding determind ones by the CROPWAT under drip, subdrip and furrow irrigation systems respectively.
8. For bean crop, In the mid growth stage, the water requirement determined by OA-Fertigation program decreased by 46 %, 46% and 53.3 % as compared with corresponding ones recorded by CROPWAT under drip, subdrip and furrow irrigation systems respectively.
9. Higher values for bean crop yield were obtained by using ES (under furrow irrigation, subdrip and drip irrigation systems) than the corresponding values of yield obtained for TR method (under drip, subdrip and furrow irrigation systems).
10. The values of cucumber yield obtained by using ES under drip, subdrip and furrow irrigation systems were higher than the corresponding values of yield obtained by using the TR method.
11. The results of comparison assured the superiority of the ES over the other traditional one, where higher values of water use efficiency “WUE” and nutrient use efficiency “NUE” were achieved by the former than the latter.
12. Using Expert system effect on increasing of crop yield were (53.4 % , 39.3% and 54.1 %) for bean crop and (9.3 %, 9.1% and 53.8 %) under drip, subdrip and furrow irrigation system respectively.
13. Using Expert system effect on increasing in WUE were (64.8 % ، 56.1 %، 55.9 %) for bean crop and (57.8 %, 59.2 %, 60.9 %) cucumber crop under drip, subdrip and furrow irrigation system respectively.
14. Using Expert system effect on increasing in NUE were (34.3 %, 15.5 % and 10.4 %) for bean crop and (19.1 %, 21.7 % and 27.1 %) under drip, subdrip and furrow irrigation system respectively.
15. The aforementioned results impose the importance of applying an expert system program for management of fertilization and irrigation of vegetable crops such as the ones used in this investigation. Such a program besides of its ability to save water used for irrigation which in turn, reflected on higher values of water use efficiency as compared with the traditional fertilization and irrigation managements.
Recommendations for future studies:
Results of this thesis can be used to help the farmers to manage their farms in Fertigation technique. Works may be required to develop such future such technique under various soil conditions to fulfill the farmers requirements. Also, this system can be developed for different crops rather than the crop used under this study to predict their requirements in terms of water and fertilizers.