Soil-Water Journal, vol.2, no.2, pp.1273-1280, 2013 (Refereed Journals of Other Institutions)
Fertigation consists of application of irrigation water with plant nutrients to plants. Therefore, both application time and doses of plant nutrients and application time of irrigation and application amounts of water are highly important. Excess watering caused yield reduction because of leaching of plant nutrients below rooting depth and reverse effects of excess water to soil aeration while deficit irrigation caused yield losses because of plant water stress. In this study watering of tomatoes by FAO-56 Penman-Monteith Method which allows estimation of plant water evapotranspiration according to weather data and plant coefficients were carried out. Estimated evapotranspiration amounts for 1, 3 and 5 days intervals applied to tomatoes with a drip irrigation system. Sufficiency of amount of irrigation water applied was checked by monitoring soil water. According to the results, it was concluded that wetting ratio under drip irrigation for closely spaced plants should be higher near to 1. Watering of tomatoes with FAO-56 Penman-Monteith Method may be suitable but great fields are required for this method. And plant coefficient for a region must already be determined.