How weather stations, sensors, precision irrigation, rain- and hail-sheltered vineyards and modern crop-protection systems help manage yields and climate risks.
This article reports on a visit to one of Moldova’s distinctive farming operations. It examines Terra Vitis’s commercial experience with Y-shaped grape trellises, pergola training, rain-cover film, smart sensors, process automation, improved decision-making, weather stations and, of course, its extensive collection of table grape cultivars. The farm has more than 130 cultivars, although some sources put the figure as high as 180. The farm manager also discusses crop-protection strategies and plant protection product programmes, market requirements for produce quality and safety, intensive sweet cherry production, and the farm’s experience using bumblebees for pollination.
You can also watch a video of a visit to the farm by a delegation of leading farmers from Uzbekistan, supported by an FAO/EBRD project.
The village of Burlacu lies in Cahul District, in the warm, dry south of Moldova. It is home to Terra Vitis, a family-owned agricultural business managed by agronomist Petru Mihov, with his son Dumitru playing an active role in its development.
Petru explains the company name literally: terra means land, while Vitis vinifera is the cultivated grapevine. Hence, “grape land.”
According to Mihov, the farm manages about 2,000 ha in 2026. Perennial crops occupy roughly 150 ha: 40 ha of table grapes, 59 ha of wine grapes, 13 ha of sweet cherry and 21 ha of pear. The remainder is devoted to arable crops; the video states that the rotation comprises 11 crops.
In 2025, EastFruit reported on the family’s collection of more than 130 cultivars, its on-farm weather station, soil-moisture sensors, three reservoirs and modern irrigation system.
A Cultivar Trial Block as a Laboratory for Commercial Selection
Terra Vitis’s trial blocks contain seeded and seedless cultivars from a range of countries. The collection is not about setting a record; its purpose is to identify cultivars that can withstand the local climate while also appealing to buyers.
“We are looking for commercially viable cultivars: easy to manage in production, able to withstand transport, with a long shelf life and good storability,” says Petru Mihov.
These requirements illustrate the complexity of cultivar selection for the fresh market. Buyers want visual appeal, flavour and seedlessness; growers need yield, resistance to cracking, diseases and frost; exporters need firm berries, transportability and long storage life. A single cultivar rarely combines all of these traits.
The farm’s main commercial red cultivar remains Moldova, a late-ripening table grape bred in Moldova. “I would put up a monument to whoever created this cultivar, because it is a lifeline for many of our farmers. It is very well suited to commercial production,” says the farm manager.
By “well suited to commercial production,” Mihov means that the cultivar performs predictably and has relatively straightforward agronomic requirements. Seedless cultivars are in demand in Europe, but the family has found that many withstand local winters less well. Terra Vitis therefore evaluates plant material from North America, Ukraine, Russia, Italy and elsewhere, assessing not only flavour and appearance but also winter injury to the vines.
An important caveat is needed here. A statement such as “this cultivar tolerates −22 °C” cannot be treated as a fixed specification. Bud and cane cold hardiness changes during winter and depends on the cultivar, preceding weather, degree of acclimation, tissue age and rate of warming. Research shows that grapevines can deacclimate quickly after a warm period, so a subsequent sharp freeze can indeed be more damaging than the same temperature in the middle of a stable cold spell. This supports Mihov’s distinction between frost tolerance and the broader concept of winter hardiness, but it does not validate the cultivar-specific temperature limits he cites without dedicated trials.
Beyond Trellising: How Canopy Architecture Changes the Economics
Terra Vitis compares a conventional vertical trellis, a Y-shaped open-gable system and a pergola. Some structures were fabricated on the farm; others were purchased in Italy. The imported system is considerably more expensive, but it is designed to carry hail netting and rain-cover film.
The advantage of wide systems is a larger, better-distributed leaf area. This allows growers to retain more fruiting wood without proportionally increasing canopy density. University of California publications on table grapes likewise associate open-gable systems with higher potential productivity than a standard T-trellis, although the outcome depends on the cultivar, pruning, light interception and crop-load management.
Terra Vitis’s own figures are impressive:
“Without irrigation, we could not harvest more than 10–12 tonnes per hectare on a conventional trellis. Increasing the leaf area raised yield by 30–40%. Adding irrigation increased it two- to threefold. This block has produced 35–42 tonnes of grapes per hectare for six consecutive years,” Petru Mihov explains.
The video also gives an indicative cost for the complete system: the support structure, film and irrigation amount to approximately €52,000 per hectare. This is the farm’s estimate, not a universal market price; the figure depends on metal costs, structure height, planting layout, film type, installation and supporting infrastructure.
Rain-Cover Film: Crop Protection and a New Agronomy
For the late-ripening Moldova cultivar, the critical risk period comes just before harvest. Autumn downpours increase the risk of berry cracking and bunch rots. Terra Vitis continues to expand the area of vineyards protected by rain-cover film and hail netting.
“After the rain, many growers saw their grapes crack. About 100 millimetres fell in three or four days, while we were able to harvest normally once the rain had passed,” the farmer says.
The family observes a cooler microclimate under the film; the grapes are slightly larger and more uniform, and ripening may be delayed. The farm also describes a small in-house trial: after simulating 20 mm of rainfall, considerably more water remained beneath the more heavily shaded training system eight days later than under a conventional trellis.
Film does not eliminate the need to manage every disease. Infection by Plasmopara viticola, the pathogen that causes grape downy mildew, depends on free water and the duration of leaf wetness, so excluding rainfall generally reduces the risk. Powdery mildew, caused by Erysiphe necator, can develop without rain and remains a threat under cover. Moreover, in table grapes, protection of the rachis and marketable appearance may be required for longer than in wine grapes. UC IPM specifically advises table-grape growers not to stop powdery mildew control merely because berries have reached 12 °Brix.
Water: Volume Matters, but So Does Chemistry
For Terra Vitis, irrigation is both a solution and a source of risk. According to Mihov, the water contains about 700 mg/L of dissolved salts and has a pH of approximately 8.
“When we irrigate, the water also brings salt into the soil. That means we have to consider how to reduce its adverse effects,” Petru Mihov says.
Under the FAO classification, water containing 700 mg/L of total dissolved solids does not fall into a ‘limit’ category; it lies within the broad range associated with slight to moderate restrictions: 450–2,000 mg/L. The TDS figure alone is insufficient. Risk assessment also requires electrical conductivity, sodium, calcium, magnesium, the sodium adsorption ratio (SAR), bicarbonate, chloride and boron concentrations, as well as information on soil properties and drainage. FAO emphasises that there is no universal threshold: the main way to prevent salt accumulation is controlled leaching below the root zone, provided drainage is adequate.
A pH of 8 alone proves neither high water hardness nor hazardous salinity. pH indicates active acidity, whereas acid demand is determined primarily by alkalinity and bicarbonate concentration. Nitric or phosphoric acid can indeed lower pH and neutralise bicarbonates, helping to prevent carbonate precipitation and manage fertigation. However, the dose cannot be calculated from initial pH alone: excess acid is hazardous to equipment, soil and people, while nitric and phosphoric acids also supply plant nutrients.
Gypsum and soluble calcium salts are used when excessive sodium is impairing infiltration. Calcium helps displace sodium from the soil cation-exchange complex, after which the sodium must still be leached out. This is not the ‘neutralisation of all salts’. Calcium nitrate, gypsum, sulphur and magnesium sulphate should be prescribed on the basis of water and soil analyses and a complete nitrogen, calcium, magnesium and sulphur balance.
Sensors at 30 and 60 Centimetres
Rather than irrigating blindly, Terra Vitis measures soil-water tension at depths of 30 and 60 cm.
“Water is scarce here. We use electronic sensors to monitor soil moisture so that we do not waste water, but also do not apply too little and subject the plants to stress,” the farmer says.
A reading in kilopascals indicates how strongly water is held by the soil: the higher the value, the harder it is for roots to extract that water. During filming, the instruments read 16 and 19 kPa, considered moist under the farm’s working scale. The family uses the following reference points: up to 30 kPa means water is adequate; at 30–50 kPa, irrigation should be considered; above 50 kPa, irrigation is required.
These readings correspond to different amounts of plant-available water in sandy, loamy and clay soils. Rooting depth, sensor position relative to the drip emitter and cultivar sensitivity also matter. A sound system therefore relies not on a single sensor but on local calibration, several monitoring points, verification of wetting depth and, where possible, plant-based indicators of vine water status.
Water Cannot Be Saved at Every Growth Stage
A grape berry follows a double-sigmoid growth curve: an initial period of rapid growth is followed by a lag phase, then ripening and renewed berry growth. Terra Vitis uses its own phenological chart for the late-ripening Moldova cultivar to redistribute scarce water over the course of the season.
Another point is particularly important for Terra Vitis: water deficit and salinity act together. The drier the root zone becomes, the higher the salt concentration in the remaining soil water. Water-saving measures must therefore preserve the required leaching fraction and include monitoring of soil electrical conductivity.
A Radio-Wave Device: An Interesting Trial, but Not a Proven Technology
At its irrigation headworks, the farm has installed a device purchased in Greece. According to the supplier, it exposes the water to ultrashort radio waves and is intended to alter the behaviour of dissolved salts.
Mihov’s own caution is reassuring: “We are not yet sure that it works… We will see whether we spent the money for nothing.”
The scientific literature does contain laboratory and small-scale field studies of magnetic or electromagnetic water treatment. Some report changes in calcium carbonate crystallisation, filtration or salt distribution; results depend on water chemistry, field strength, flow rate and device design. Even an early study reporting positive effects noted that field-test outcomes varied among regions and operating conditions. See this experimental study of magnetic treatment of irrigation water.
A Weather Station Does Not Replace an Agronomist
The farm uses weather stations, disease and pest forecasting models, and a camera trap. The system sends temperature, rainfall and wind data, as well as photographs of captured insects, to a mobile phone. Using temperature and humidity data, the software estimates potential infection periods and pest development stages.
Mihov defines the limits of such automation precisely: “It only provides a theoretical indication of how everything is developing. We then decide what to do. It is a signal.”
Mating Disruption against European Grapevine Moth
Terra Vitis uses passive pheromone dispensers at a rate of approximately 300–350 per hectare. A high background concentration of synthetic sex pheromone interferes with males’ ability to locate females, reducing mating.
This dispenser density is consistent with standard practice: research papers cite roughly 200–500 passive dispensers per hectare. Field trials show that mating disruption can substantially reduce bunch damage. It works best on sufficiently large, contiguous blocks, when initial pest pressure is low and wind exposure and field edges are properly accounted for.
However, zero male catches in a conventional pheromone trap within a mating-disruption block do not mean the pest is absent: trap shutdown is expected when the air is saturated with pheromone. A decision to omit insecticide should therefore consider not only trap catches but also surveys of eggs, inflorescences and bunches, crop damage and the locally established economic threshold.
Pesticide Residues: Market Specifications and Resistance Risk
According to the family, Terra Vitis exports table grapes to Romania, Poland and Germany. The video states that exports approached 800 tonnes in 2025. To meet European buyer requirements, the farm tests its produce in a local laboratory and sends samples to Italy.
Under the film, the family detected a greater number of active substances and higher residues of some products than in the uncovered block. The suggested explanation—no wash-off by rain and altered degradation conditions—is plausible but not universal. Dissipation depends on the specific substance, whether the product is systemic, ultraviolet exposure, temperature, humidity, dose and the pre-harvest interval.
Representatives of Terra Vitis and several other Moldovan farms visited by the Uzbek delegation said that “fruit should contain no more than four or five active substances.” This is important to frame correctly: it is a private specification used by certain buyers and has become fairly common, but it is a market requirement rather than an EU-wide rule. EU law does not impose a general limit of four or five active substances in fruit. Instead, it sets a maximum residue level (MRL) for each pesticide–product combination. EFSA explicitly notes that the presence of multiple residues does not in itself constitute non-compliance, provided each is within its legal limit; cumulative exposure is assessed separately. Retailers may nevertheless impose stricter private specifications, including limits on the number of active substances detected or the percentage of the MRL.
The video suggests repeatedly using a product with a single active substance during the second half of the season so that fewer different residues are detected at harvest. However, this approach carries a serious countervailing risk: repeated use of a single mode of action intensifies selection for resistant fungal or insect populations.
Gibberellic Acid: A Useful Tool with a Very Narrow Application Window
In its cultivar trial, Terra Vitis is testing gibberellic acid (GA₃) to loosen clusters and increase berry size. Applications before or during bloom can reduce fruit set and loosen the cluster; after bloom, the compound is used to size berries, particularly in seedless cultivars.
“In Egypt, they talked about ‘gibberellic acid week’—a short window in which the effect is greatest. We still do not know; we are studying it here,” the farmer says.
Science confirms both the benefits and the risks. GA₃ is indeed used to reduce cluster compactness and increase the size of seedless berries. However, recommendations depend strictly on the cultivar, growth stage, application method, spray volume and desired effect. In University of California trials on Scarlet Royal and Sweet Scarlet, rates at bloom and after fruit set differed severalfold; higher or repeated treatments increased the proportion of small berries, caused berry shatter or reduced return fruitfulness in the following season. The researchers stress that a separate programme must be developed for each cultivar.
The video mentions a programme of “100 mg/L for all seedless cultivars and 50 mg/L for seeded cultivars.” This should be regarded as the experience of one specific farm rather than a universal recommendation.
Sweet Cherries under Netting and Pollination by Bumblebees
In addition to grapes, the farm grows 13 ha of sweet cherry; part of the orchard is covered by rain-protection film and hail netting. The covers help protect ripening fruit from rain and cracking, but the netting is installed only after pollination. In 2026, purchased bumblebee colonies were added to the honeybee hives.
“In the block where we had bumblebees, we harvested about 20% more. That suggests pollination was better,” Petru Mihov says.
The Core Technology Is Not a Sensor, but a Cycle of Verification
What makes Terra Vitis interesting is not the number of individual devices, but the way they are integrated into a single production logic. A cultivar first undergoes local testing. The training structure is selected with yield, labour and future covers in mind. Irrigation is adjusted using sensor readings and the crop’s growth stage. The weather station does not issue a spray command; it provides a signal to the agronomist. The produce undergoes laboratory testing before export.
The strongest point in the video is not a high yield figure or an expensive system. When discussing unsuccessful gibberellic acid treatments, the family openly shows photographs and acknowledges its mistakes. This approach—trial first, then measurement, then scaling—is the foundation of precision agriculture and an efficient business.
The visit was organised under the FAO/EBRD initiative on climate and environmental sustainability in the agrifood sector, specifically the subcomponent “Greening the Fruit and Vegetable Value Chain in Uzbekistan,” with support from Moldova’s Federation of Agricultural Producers, FARM.
The organisers sincerely thank Petru Mihov for the opportunity to learn from his extensive experience and tour the company’s orchards and vineyards.
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