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Abstract

The aim of this experiment was to study the effect of irrigation on growth and yield of strawberry grown in coir base substrate in greenhouse. This experiment was divided into 2 steps, the first step was the selection the substrate for strawberry cultivation. The substrate used in this experiment were coconut coir, a coir-sand mix, coconut coir compost, a coir compost-sand mix, a coir compost-coir mix and a coir compost-coir-sand mix. This experiment compared some physical properties of the substrate, including total porosity. water holding capacity and air porosity. The results showed that, a coir compost-coir mix had the highest the total porosity content (55.89 % by volume). Coconut coir, coconut coir compost, a coir compost-sand mix and a coir compost-coir-sand mix had the total porosity content was not significantly different, and a coir-sand mix had the lowest total porosity content (47.62 %). Coconut coir had the highest water holding capacity content (35.34 %). coconut coir compost, a coir compost-coir mix and a coir compost-coir-sand mix had the water holding capacity was not significantly different, a coir compost-sand mix and a coir-sand mix had the lowest water holding capacity content (17.80 %). a coir compost-sand mix and a coir compost-coir mix had the highest air porosity content (25.78 and 22.98 % respectively), followed by a coir-sand mix, coconut coir compost and a coir compost-coir-sand mix respectively. Coconut coir had the lowest air porosity content (12.28 %). The substrates that had the optimum water holding capacity content were coconut coir compost, a coir compost-sand mix, a coir compost-coir mix and a coir compost-coir-sand mix. Moreover, after experimental, a further experiment on the collapse of thesubstrate was performed, it was found that the collapse of the substrate depended on the material being mixed. Coconut coir compost has the most collapse (0.58 cm). The substrates mixed with sand had a smaller collapse in ratio to the mix. But sand is heavy, it can be causing obstacle in cultivation in greenhouses. Therefore, a coir compost-coir-sand mix was chosen as the experimental substrate in the next step. The next step is studying the effect of watering regimes on the growth of strawberries. Strawberry (Pharachatan 80) was grown in A coir compost-coir-sand mix with 4 different irrigation: (1) Irrigation according to farmer (control) (2) according to water requirements of plant (ETc) (3) controlling the material moisture at water holding capacity (WHC) and (4) controlling the material moisture at 90% WHC, Measuring crown diameter, crown number, plant height, leaf greenness, root length, leaf area, fresh weight of stem, dry weight of stem, fresh weight of root and dry weight of root. There was no significant in crown diameter, crown number, leaf greenness, leaf area and dry weight of root. However, Plant height of (2) (3) and (4) irrigation was significantly lower than the control. But Root length is highest in plant growing in (4) (29.60 cm) irrigation followed by (3) (24.20 cm), (2) (23.80 cm) and (1) (19.10 cm) irrigation respectively. Fresh weight of stem is highest in plant growing in (1) (21.75 g) followed by (2) (16.84 g), (3) (11.18 g) and (4) (11.00 g) irrigation respectively. Dry weight of stem is highest in plant growing in (1) (6.20 g) followed by (2) (4.63 g), (4) (2.84 g) and (3) (3.08 g) irrigation respectively. Fresh weight of root is highest in plant growing in (1) (22.25 g) but it was no significant in plant growing in (2), (3) and (4) (11.82, 10.87 and 9.56 g respectively). As a result of these data, (4) irrigation could be recommended because it can reduce water loss which leads to reduced production costs.