**2. Result and discussion**

Some blooming characteristics for Festival cv. rose dramatically at photoperiod 4 h, such as blossom number. Similar to (Hidaka et al., 2014), plant-1 (32.200) in the second season, viability pollen grain percentage (80.156%) in the first season, and fruit set percentage (86.120%) in the second season (**Figure 1**).

Some fruit parameters increased significantly at photoperiod 4 h, such as fresh weight of strawberry fruit (13.782 g) in the second season and dry weight of strawberry fruit (3.467 g) in the first season; dry weight percentage recorded the highest value (29.515%) for Albion cv. in the first season, while Festival cv. recorded the

*Effect of photoperiod on some flowering parameters of two cultivars in two seasons 2017–2018.*

*Response of Strawberry (*Fragaria X ananassa *Duch.) Flowering and Yield to Photoperiod DOI: http://dx.doi.org/10.5772/intechopen.105442*

#### **Figure 2.**

*Effect of photoperiod on some fruit parameters of two cultivars in two seasons 2017–2018.*

lowest value (7.357%), Number of fruits. Plant-1 significantly increased (27.943) for Festival cv. at photoperiod 4 h in the first season and the lowest value recorded (11.111) for Albion cv. at control treatment in the first season. Finally, fruit fall percentage recorded the highest value (21.942%) for Albion cv. at control treatment in the second season and the lowest value (10.108%) for Festival cv. at photoperiod 4 h in (**Figure 2).**

Strawberry fruit diameter increased significantly to 3.984 cm for Festival cv. at photoperiod 4 h in the first season of planting, while fruit length increased dramatically to 4.688 cm in the second season for Albion cv. at photoperiod 4 h, and fruit size recorded the highest value (4.307 cm3 ) in the second season for Albion cv. at photoperiod 4 h and the lowest value recorded (1.321 cm3 ) for Festival cv. at (**Figure 3**).

*Effect of photoperiod on yield of two cultivars in two seasons 2017–2018.*

#### **Figure 5.**

Yield per plant-1 (g) and yield per hectare-1 (Kg) rose considerably at photoperiod 4 h for Festival cv. (100.591) in the second season and (96.633) in the first season, respectively (**Figure 4**).

Strawberry marketable fruits percentage increased significantly (89.344%) for Albion cv. in the second season at photoperiod 4 hours, while unmarketable fruits recorded the highest value (17.932%) for Festival cv. at control treatment in the first season and the lowest value (9.769%) for Albion cv. in the second season at photoperiod 4 hours (**Figure 5**).
