Within the framework of the project “Boosting Circular Systemic Solutions through Virtual Regional Circular Economy Spaces,” Project acronym “CSSBoost,” a study is being conducted on the creation of biostimulants through the cultivation of fava beans for tomato cultivation. The study is carried out in Heraklion, Crete, in the Malades area, with the collaboration of the producer Mr. Evangelos Vassalos and the support of Xalkiadakis Supermarkets.
The cultivation of fava beans took place in November 2024. During the period from November to January, there was a slight but steady increase in plant growth, accompanied by fertilization. From January to April 2025, systematic inspections of the experimental fava bean cultivation were performed, revealing a gradual effect of the fertilizer on the plant tissue. Normal vegetative growth was observed, along with regular photosynthetic activity and no signs of phytopathology or nutrient deficiencies.
During this period, the first inflorescences were recorded on over 10% of the plants, with a growth rate aligned with the predicted crop phase models. Mechanical hoeing was performed to achieve weed reduction (exceeding 85% weed destruction) and improve soil aeration. Soil moisture measurements (TDR sensors) indicated increased permeability and better moisture distribution in the root zone, which is expected to enhance water and nutrient uptake.
Soil sampling was conducted at five predetermined points, collecting three subsamples per point at depths of 10, 20, and 30cm. Precise tools, including a soil auger and depth gauge, were used. Overall, 2–3 kg of soil samples were collected per depth and sent to an accredited laboratory for analysis of physicochemical properties (pH, EC, organic matter), macronutrients (N, P, K, Mg, Ca), and micronutrients (Fe, Zn, Mn). Sampling focused on the surface zone of 0–35 cm, corresponding to the absorptive root system of fava beans.
The installation of the irrigation system with state-of-the-art electrovalves connected via a LoRa wireless network for remote monitoring and control was completed. The Smart Agrogenius system, operated by the Mediterranean Agronomic Competence Center (MACC), has been activated for continuous recording of irrigation and soil parameters. Additionally, a meteorological station base was installed for precise recording of climatic data (temperature, humidity, wind). The full flowering phase was recorded (>90% inflorescences). In early March, a fungicide spray approved for controlling scab was applied, and fertilization through the irrigation system using water-soluble fertilizers was scheduled.
Three cultivation rows were delineated for early incorporation. Plants are currently at 50% flowering, with reduced vegetative growth likely due to increased temperatures (recorded daily mean temperature >25°C), characteristic of the late growth phase. Pollination and pod development are progressing normally. The Smart Agrogenius system continues uninterrupted operation, with the producer fully trained in its use and monitoring. Data from the system indicate optimized water and nutrient use, contributing to yield maximization.
Currently, the field is being prepared for the planting and cultivation of tomatoes, which is the second stage of the pilot application of the biostimulants.
Useful links:
https://macc.gr/en/cssboost-in-crete-a-model-of-circular-agri-food-transition-through-the-collaboration-of-macc-chalkiadakis-supermarkets-vagelis-vassalos/
https://macc.gr/to-cssboost-stin-kriti-protypo-kyklikis-agrodiatrofikis-metavasis-meso-tis-synergasias-macc-sm-chalkiadakis-vaggeli-vassaloy/
https://www.instagram.com/p/DI1PZfCplMZ
https://macc.gr/apo-to-chorafi-sto-rafi-to-montelo-ton-sm-chalkiadakis-poy-endynamonei-tin-viosimotita-toy-topoy-mas/
https://macc.gr/macc-proothisi-kyklikis-oikonomias-meso-viosimon-agrodiatrofikon-lyseon/
https://maps.app.goo.gl/5SR1hc9yGhkxJAsJ8