الفهرس 
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Abstract
Field experiment was conducted in private Farm at Maghnin Village, Kom Hamada city, El-Behera Governorate, Egypt in 2016/2017 and 2017/2018 seasons to evaluate the response of fennel plant to NPK doses, stimulant acids (AA, SA, and TR), and their interaction.
Fennel seeds of local variety was sown on 1st and 2nd Nov.2016 and 2017 seasons, respectively in rows 60 cm apart and hills 30 cm in between. The experiment was designed as a split plot design, where the NPK doses were arranged as mean plots, while the used acids were arranged as sub plots.
The treatments were conducted as follows:
• NPK doses:
1- NPK full dose (100% NPK) 2-75% NPK dose 3- 50% NPK dose 4- 25% NPK dose.
Where, NPK suggested full dose were 150+150+50 kg/fed of ammonium sulphate (20.5%N), calcium superphosphate (15.5% P2O5), and potassium sulphate
(48%K2O), respectively. (7.5+7.5+2.5 g/plant of aforementioned NPK fertilizers, respectively). Calcium superphosphate was added as one dose at soil preparation before planting. N and K fertilizers were divided into two equal doses, the first one was added two days after thinning and the second one was added one month later.
• AA, SA, and TR were used as foliar spraying as follows: 1- Control (without spraying 2- AA+SA each at 200 mg/l. 3-AA+TR each at 200 mg/l. 4-SA+TR each at 200 mg/l. 5-AA+SA+TR each at 100 mg/l. Where, the plants were sprayed 3 times on 26th Dec., 26th Jan., and 25th Feb in the first season and30th Dec., 30thJan., and 1st March in the second one.
The obtained results could be summarized as follows:
5.1. Vegetative growth parameters:
For NPK doses effects. The significantly highest values of plant height, shoots number/plant, main stem diameter, and shoots dry weight/plant resulted from application of 100% NPK dose in the two seasons. Also the decrement in the values of such traits was gradually with decreasing NPK dose in the both seasons.
In respect to acids effect: data cleared that the most positive effect on vegetative traits mentioned before was the treatment of 100 mg/l of each AA, SA, and TR, while the least significant values of such traits resulted from control (unsprayed plants) in the two seasons.
Concerning the interaction effect between the used factors, the results indicated that the treatment of 100% NPK dose combined with 100mg/l of each AA, SA, and TR was the best in improving the plant height, shoots number/plant, main stem diameter and shoots dry weight/plant. On the other hand, the least significant values of such traits were recorded for 25% NPK dose without spraying with any acid in the both seasons.
5.2. The flowering and fruit yield parameters:
Regarding NPK doses effect, data indicated that the treatment of 100% NPK dose achieved the significantly highest values of umbel numbers/plant and diameter and weight of 100 fruits in the both seasons. While the highest significant fruit yield/plant resulted from the application of 75% NPK dose in the both seasons. On contrary, 25% NPK dose gave the least significant values of such traits in the two seasons.