During the past few decades, vertical farming has attracted a lot of interest as an alternative food production method. Vertical farms use engineered growth environments and hydroponic cultivation techniques for growing plants indoors. One of the important factors in vertical farming for the cultivation of different plants is the amount of nutrients, which can be measured as electrical conductivity (EC). Studying the optimal EC is important for avoiding nutrient loss and deficiency in vertical farms. In this study, we investigated the effect of five EC levels (2, 1.2, 0.9, 0.7, and 0.5 dS m−1) of Hoagland nutrient solution on the growth and development of basil cultivar ‘Emily’ and lettuce cultivar ‘Batavia-Caipira’. During the study, the environmental parameters were kept fixed using an automatic dosing machine. The experiment was done in automatic vertical farms using the hydroponic ebb–flow cultivation technique with a temperature of 20 ± 1 °C, relative humidity of 50–60%, CO2 concentration of 450 ppm, pH = 6, the PPFD (photosynthetic photon flux density) of 215 ± 5.5 μmol m−2 s−1, and the photoperiod of 16:8 h (day/night). Each treatment was replicated four times. We studied the effects on several growth parameters (including the dry and fresh weight of leaves and roots, number of leaves, and leaf area) as well as the chlorophyll and nitrogen concentration of the leaves. According to the results, the basil and lettuce growth parameters among the five treatments have been significantly higher in the treatment with EC of 1.2 and 0.9 dS m−1. These EC values are lower than the recommended EC value given as the optimum in the previous studies. However, the concentration of chlorophyll and nitrogen show different trends and were higher in full strength of nutrient solution with EC = 2 dS m−1.
The agricultural sector in developing countries is one of the most vulnerable sectors to climate change and water scarcity. Iran is one Middle Eastern country facing a growing water crisis. Rafsanjan county, located in the province of Kerman, is losing its pistachio orchards to water shortages and climate change. The modernisation of irrigation methods and transfer of water from other regions have been the main strategies taken by the governmental authorities. The lack of success of these strategies has led to the emergence of more participatory approaches in the transformation of the agricultural sector and local urban planning in Rafsanjan. This study analyses the actor network of transformation in the agricultural sector and the rise of high-tech urban agriculture, and aims to understand the role of technologies in supporting citizen participation in local urban planning. The research draws on the concept of Technology-Driven Transitions (TDT). The interactions among social and materials entities and the impact of technological novelties on the re-configuration of their relationships in the transition process were studied. The research comprised an exploratory case study, and data were gathered through observations, document study and in-depth interviews with farmers, planners, researchers, and policy makers in Rafsanjan. The results of the study show that governmental planning organizations and their implementation bodies, such as the Agricultural Research, Education and Extension Organization (AREEO) and the 10-year plan for the development of greenhouses, were the most influential actants in the transition process. Their relationships with the other actants involved, such as the private sector, knowledge institutes and farmers, were re-configured by technological novelties. This re-configuration of relationships has led to strengthened participatory decision making in local urban planning in Rafsanjan.
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