Jafar Massah; Hassan Tahmasebi; Mahmoud Reza Roozban; Behzad Azadegan
Abstract
The use of methods to reduce energy consumption in greenhouses such as reduced heat losses, and improved efficiency of heating, cooling, and irrigation systems cancut energy consumption for the production of any crop to several times. The present research has designed and built an automated system ...
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The use of methods to reduce energy consumption in greenhouses such as reduced heat losses, and improved efficiency of heating, cooling, and irrigation systems cancut energy consumption for the production of any crop to several times. The present research has designed and built an automated system for climate control of a rose greenhouse. This system is consisted of control and measurement stations. The control unit, itself, is consisted of a human-machine interface (HMI) device; while the measurement station is formed of one humidity, one light, and eight temperature sensors. Climate conditions of the greenhouse is received by the measurement station, there to be sent to the control one. Also, energy consumption in both systems are calculated and analyzed, too. The present research compares the impacts of the built automated system for climate control of greenhouse on the qualitative and quantitative traits of three cut-roses cultivars including 'Angelina', 'Samurai', and 'Red One' with the control system. Quality index and shoot weight of the cut-roses are improved under the automated system than the control. But there no difference could be found in traits of flowering stem length and number, stem diameter, number of lateral and blind shoots, internodes length, and vase-life, between the crops of two systems compared. The results also indicate a reduction in energy consumption under the automated climate management system than the control, equal to 12%. In sum, considering that the use of climate control system has improved the efficiency of energy consumption without having a negative impact on the quantitative and qualitative characteristics of the crop, it is recommended.
Behzad Azadegan; Reza Kouhestani; Mahmoud Mashal
Abstract
This study aims at investigating morphological and physiological characteristics as well as water use efficiency of the stock plant in various low irrigation treatments and culture media. For so doing, a research has been conducted in the form of split plots with a completely randomized block design ...
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This study aims at investigating morphological and physiological characteristics as well as water use efficiency of the stock plant in various low irrigation treatments and culture media. For so doing, a research has been conducted in the form of split plots with a completely randomized block design with three replications in the crop year 2018-2019 in the research greenhouse of the College of Abouraihan, University of Tehran. The treatments include four culture media (perlite, perlite + enriched manure, perlite + zeolite, and perlite + vermicompost) and three low irrigation levels (100% (control), 75%, and 50% of water needs). Results indicate the significant effects (P < 0.01) of culture medium on plant height, stem diameter, leaf area, root fresh and dry weight, plant fresh and dry weight, as well as water use efficiency, and the perlite + vermicompost media improves all these traits. Moreover, severe irrigation treatment (50%) has had negative effects on plant growth parameters, i.e., root fresh weight and diameter, while irrigation at 75% of water needs does not have any undesirable effect on plants, significantly increasing water use efficiency (P < 0.01). The perlite + vermicompost with 75% low irrigation treatment increases the water use efficiency by about 1.8 times, compared to the control in the perlite culture media. Due to the decrease in the quality of growth characteristics in severe low irrigation treatments (50%), this plant’s production is recommended in irrigation at 75% of the water needs.
Behzad Azadegan; Reza Amiri
Volume 12, Issue 1 , May 2010, , Pages 1-9
Abstract
The objective of this research was to study the effect of fertilizer management on the yield increase of crop plants. The extra amounts of applied fertilizers were studied by comparison between allocated, applied and recommended fertilizers’ amounts for: wheat, barley, corn and alfalfa with four ...
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The objective of this research was to study the effect of fertilizer management on the yield increase of crop plants. The extra amounts of applied fertilizers were studied by comparison between allocated, applied and recommended fertilizers’ amounts for: wheat, barley, corn and alfalfa with four replicates and the other data was gathered via questionnaires. Soil analysis of phosphorus, potassium and nitrogen amounts was performed in 20 fields and analysis of data was conducted base on complete randomized block design. Comparison of the averages was showed that there were significant differences between the amounts of allocated, applied and recommended fertilizers (P? 0.05). The average amounts of extra applied and extra distributed fertilizers were 382.9 and 150.6 Kg.ha-1 more than the recommended amounts, respectively. However, there was no significance increase in yield. 12 and 28% of farmers used the fertilizers in the basis of recommended and allocated, respectively and 60% of them used more than recommended amounts. Excess fertilizer application due to improper management causes reduction of soil and water quality.