Tomatoes (Lycopersicon esculentum Mill.) were grown on a
fine sandy soil using drip irrigation and polyethylene mulch to evaluate the
effects of irrigation scheduling on yield parameters. Under typical Souss Massa
production conditions. Capacitive sensors were used to automatically schedule
irrigations. And twelve irrigation treatments have been applied with a
combination between three doses (50%, 75% and 100% ETC) and frequencies
(f=0.10, f=15% and f=20%).
The result of this study shows that irrigation dose and frequency doesn‟t affect fruits number in grafted tomato plant (medium number =4.25 fruits/cluster); no significant effect on medium fruit size has been observed, unlike each separate fruit size. However, irrigation have a moderate effect on total yield (reducing dose by 50%ETC generate a loss of 7% of yield). The effect of Irrigation frequency on yield doesn‟t exceed 2%.
Although, we can achieve the same performance with two completely different irrigation frequencies, this is explained by the regulation of soil water content which is limiting the effect of irrigation frequencies. According to our study we can confirm that irrigation scheduling can also control the size of marketable fruits.