Mojtaba Delshad; Roghayeh Alfatahi; Toktam Sadat Taghavi; Masud Parsinejad
Abstract
Abstract
Low water holding capacity of soilless substrates increases water stress and waste of nutrient solution. Irrigation time management can reduce such problems. In this research, responses of hydroponically cultured greenhouse strawberries were evaluated under different irrigation schedules. In ...
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Abstract
Low water holding capacity of soilless substrates increases water stress and waste of nutrient solution. Irrigation time management can reduce such problems. In this research, responses of hydroponically cultured greenhouse strawberries were evaluated under different irrigation schedules. In first step, plant daily water need was estimated and then delivered to plants through two methods: One time irrigation (total amount delivered to plants at early morning) and multiple irrigation in which the amount of nutrient solution divided in to 4 parts and delivered to plants during day. Result showed that graduate irrigation could improve medium moisture status, reduce stomatal resistance, improve leaf water potential and finally increase yield and plant water use efficiency.
Keywords: Irrigation, Stomatal resistance, Leaf water potential, Strawberry yield
Azadeh Esfandiari; Toktam Sadat Taghavi; Mesbah Banalar; Mojtaba Delshad
Abstract
Abstract
In order to provide optimal yield and quality of tomato fruit (Lycopersicon esculentum Mill. cv. Beril), different growing media for soilless culture of tomato plants were studied. seedling of tomato (Lycopersicon esculentum Mill, cv. Beril ) were cultivated in perlite, mixture of perlite with ...
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Abstract
In order to provide optimal yield and quality of tomato fruit (Lycopersicon esculentum Mill. cv. Beril), different growing media for soilless culture of tomato plants were studied. seedling of tomato (Lycopersicon esculentum Mill, cv. Beril ) were cultivated in perlite, mixture of perlite with NH4-zeolite and with raw zeolite (z:p ratio 10v:90v) and fed by two nutrient sources: a) complete nutrient solution (N+) b) nutrition solution with 30% decrease in N concentration. The experimental design was split plot with complete randomized block design. Fruit quality and yield were determined during growth. Result indicated that fruit yield, length of fruits and titrable acidity decreased and small fruits increased with reducing nitrogen in solution. Solution didn’t significally effects in yield. Fruit weight were reduced significantly with nitrogen decreasing in nutrition solution, But solution types didn’t affect on yield. Media significantly affected yield, Weight of fruit, number of fruit per plant and medium fruits (70-100g). The highest of this characteristic obtained in saturated zeolite and perlite. Interaction effect of incomplete solution and saturated zeolit media caused a reduction in weight of fruit, dry mater, small fruit ratio in yield and vitamin C in comparison to other media. There weren’t significantly difference among TSS, firmness and density.
Key words: soilless culture, media, zeolite, nitrogen
Maryam Haghighi; Mohsen Kafi; Toktam Taghavi; Abdolkarim Kashi; Gholamreza Savaghebi
Abstract
Abstract
study on photosynthetic and enzym Activity changes in lettuce under cadmium stress has been done in greenhouse. Of zhejang university in Chine The experimental design was a CRD factorial design organized in hydroponic system with 7 replications. Cadmium was added to nutrient solution in CdCl2 ...
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Abstract
study on photosynthetic and enzym Activity changes in lettuce under cadmium stress has been done in greenhouse. Of zhejang university in Chine The experimental design was a CRD factorial design organized in hydroponic system with 7 replications. Cadmium was added to nutrient solution in CdCl2 in three concentrations (0, 2, 4 mg/l). Stomatal photosynthetic factors (transpiration, stomatal and mesophyl conductance, internal CO2 concentration), enzyme activity changes (Proxidase and Superoxid Dismutase),chlorophyll, leaf length and number, biomass, transfer coefficient, was measured. Results showed that peroxidase and superoxide dismutase increased but biomass, photosynthesis, transpiration, stomatal conductance, internal CO2 concentration and leaf length was decreased as cadmium increased in nutrient solution, transfer coefficient was increased also.
Key Words: Photosynthesis, Chlorophyll, Stomata, Antioxidant, ,Cadmium, Lettuce
