Z. Razmi , A.a. Ghaemi,
Volume 2, Issue 3 (Journal of Science and Technology of Greenhouse Culture 2011)
Abstract
Abstract
In order to determine the actual evapotranspiration of tomato in the greenhouse, crop and soil-water stress coefficients were surveyed. To compare the actual evapotranspiration at different irrigation intervals (1, 2, 4, 6 and 8-day), a completely randomized blocks design with four replications was performed. The present study was carried out in a greenhouse covered by 4 mm thick glass. Maximum and minimum temperatures and solar radiation were measured inside the greenhouse once in 24 h. Relative humidity was measured in the greenhouse once in 2 h. Microclimate data were measured in a metrological station, 100 m from the greenhouse, simultaneously, at outside the greenhouse. Reference crop evapotranspiration was calculated by FAO Penman-Monteith method for inside and outside of the greenhouse. Results indicated that the reference evapotranspiration in the inside of the greenhouse was 73% of outside the greenhouse. The actual evapotranspiration of tomato for inside of the greenhouse was determined by using the water balance method. By using the pergeometer and albidometer data, the crop coefficient for inside the greenhouse at three different stages (development, mid, and end) of growth was determined as 0.85, 1.0 and 0.77, respectively. Soil-water stress coefficient, with readily available coefficient of 0.7, was determined to be in the range of 0.53 to 0.98 for all the treatments. This coefficient was 0.88 for water-stressed 4-day treatment, and reduced to 0.72 for 8-day treatment.
En Ali Asghar Ghaemi, En Mohammad Hossein Salimi, A. Tabarzad,
Volume 8, Issue 3 (Journal of Science and Technology of Greenhouse Culture 2017)
Abstract
Scarcity of conventional water resources and high volume of wastewaters have increased the important role of crop residues to reduce evaporation from soil surface and optimal use of water, especially in greenhouse cultivation. In the present research, the impact of crop residues and fishery’s wastewater on yield, qualitative characteristics and water productivity of cherry tomato was studied. The experiment was carried out with two main treatments (tap water (from a well), w0, and fishery’s wastewater, w1) and four levels of crop residues (0, 5.5, 11 and 16.5 gram crop residue per kg of soil, as M1, M2, M3 and M4, respectively) based on a split-plot design with four replications, in Research Greenhouse of College of Agriculture, Shiraz University. Results showed that fishery’s wastewater increased the yield of cherry tomato more than well water. But application of crop residues in both wastewater and well water treatments increased the yield up to a certain level (11 gram per kg soil), and in 16.5 gram crop residues per kg soil (treatment M4) decreased the yield and evapotranspiration. Fishery’s wastewater did not have any harmful effect on fruit quality. Results also showed that water productivity of wastewater treatment, at all levels of crop residues, was more than well-water treatment. Maximum and minimum fruit yields (0.732 and 0.32 kg per plant) were obtained in W1M3 and W0M4 treatments, respectively. Maximum and minimum amount of net consumptive water use (434 and 348 liters) were obtained in W0M1 and W1M4 treatments, respectively.
