Growing Food in Cities: Rooftops, Window Sills, Vertical Farms, Urban Agroecology

Our objective was to characterize the growth, physiological responses, fruit yield, and quality of tomato (Solanum lycopersicum L.) plants grown under different daily light integrals (DLIs) and photoperiods. In experiment I, nine compact tomato cultivars were grown indoors using broadband white light-emitting diode (LED) fixtures. Plants were grown under low (10.4 mol·m⁻²·d⁻¹) and high (18.4 mol·m⁻²·d⁻¹) DLIs with 12 and 16 h photoperiods, respectively, and two intermediate DLIs of 13.8 mol·m⁻²·d⁻¹ with either 12 or 16 h photoperiods. In experiment II, three compact tomato cultivars were grown under the same low DLI with either 8 or 12 h photoperiods, and the same high DLI with either 12 or 16 h photoperiods. Generally, higher DLIs decreased plant growth and increased the fruit yield. Changing the DLI delivery strategy by adjusting the photoperiod and photosynthetic photon flux density (PPFD) did not have major effects on the growth, yield, and fruit quality of the compact tomato plants evaluated in this study, even though net photosynthesis increased under higher PPFDs in experiment II. Although several cultivars were affected by intumescence, only two cultivars showed treatment responses, for which the severity was generally higher in lower PPFDs using the same DLI. Full article

The amount of green is relatively low in most cities. Often, the cause of this situation is urban policy which favours developers. Far-reaching urbanization results in various environmental and social problems. In those circumstances, a need for the wider revitalization and reorganization of urban space becomes even more important and necessary. Our article is a review. It discusses the significance of community gardens in Poland due to people’s limited access to private gardens and the growing development of housing estates in cities. In recent decades, cities have developed rapidly in Poland. However, this development was often uncontrolled because very compact building patterns were applied in new housing estates. As a result, in many places the urban tissue lacked common public space. Urban planners adopted a new approach to public goods, including green spaces, and reconsidered the development of cities. Common space was found to be fundamental for the development of the identity of individual neighbourhood groups and, consequently, for social changes. Community gardens are an example of changes introduced to the urban landscape as a consequence of considering common space significant. As a result, local residents can integrate and change their attitude to public space, which is perceived as part of the community. Users gain a sense of community, solidarity, and shared responsibility. The community garden becomes a reason for neighbourhood residents to integrate despite the fact that they may differ in their political views, background, and age. Community gardens are established in a similar way all over the world. However, there might be local differences in the legal system, people’s mentality, and access to land. Community gardens are a new phenomenon in Poland. They are established mainly in big cities, e.g., in Warsaw, Kraków, and Poznań. Community gardens have numerous advantages. Their users are physically active, and they are thus at lower risk of chronic and non-infectious diseases. They grow vegetables and thus change their eating habits. In addition, community gardens reduce stress. Due to gardening, users feel better, broaden their social contacts, participate in cultural events, and enrich their diet. This article shows how the intensive development of housing estates in Poland affects the availability of green areas. The advantages of community gardens in Poland and other countries, methods of plant cultivation and how community gardens functioned during the COVID-19 pandemic are discussed. With this short review, we want to broaden the knowledge about community gardens as their development in Poland is different than in other countries and to encourage their establishment due to the decreasing amount of green space and dense urban development. Full article

The growing need for clean energy and food production are favoring the use of underused spaces, such as rooftops. This study aims to demonstrate the compatibility of the use of rooftops both for the production of photovoltaic energy and for the production of food, despite the fact that both compete for the same resource, sunlight (rooftop agrivoltaic). In the experiment reported in this study, which was carried out in Almería (Spain) during the spring and summer of 2021, three shade treatments were tested for a lettuce crop, produced by photovoltaic modules with different arrangements: concentrated shade (CS), scattered shade (SS) and full sun (FS). This experiment was repeated in two seasons with high radiation levels and temperature. The results show that in these environmental conditions, the cultivation of plants that demand little sunlight, such as lettuce, is compatible with the shading produced by photovoltaic panels. In addition, it is shown that the same percentage of the area covered with shade (22%), but using mini-PV modules arranged in patterns, improves the productivity (fresh weight, dry matter, number of leaves, maximum length and dry matter of roots) of lettuce cultivation, both in spring and summer. Full article