Yokohama OHT Scientific VF Tyre Data for Farmers' Enthusiasm

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Yokohama (YOHT)
Published on
July 1, 2022

In partnership with TAMA and Topcon, Yokohama Off-Highway Tires (YOHT) hosted a press event to highlight two of the company's outstanding tyre options for farmers and contractors, the Alliance 372 VF and the Agri Star II.

On May 25, 2022, in Maastricht, a press conference and field demonstration was held to present the findings of a recent scientific study in Denmark. "We highly value and appreciate scientific input from independent parties such as SEGES Innovation in Denmark, and we indeed appreciate consistently positive results. Whilst scientific evaluations are an indispensable element of any tire development at YOHT and Alliance, receiving confirmation from the field that our products deliver as planned – or even better – is truly encouraging", highlighted Angelo Noronha, President Europe at ‎Yokohama Off-Highway Tires.

Measurable benefits for farmers

The experiment was summarised briefly by Henning Sjrslev Lyngvig, Senior Specialist, Agricultural Machinery Crops & Environment at SEGES Innovation, who accompanied and evaluated the field trials in Denmark. The 'conventional tyre plots' used conventional tyres with inflation pressures of 2.2-2.5 bar (tractor) and 3.0 bar (liquid manure spreader), while the 'VF tyre plots' used Alliance 372 VF on the tractor and Alliance 389 VF on the liquid manure spreader, both with inflation pressures of 1.0 bar.

Dimensions of conventional and VF tires were identical. "The low inflation pressure of the Alliance VF tires cut the track depth during the application of liquid manure in half – from 79 to 45mm. At the same time, wheel slip was reduced by 4.4 per cent. When we measured soil density with a penetrometer, we were able to show lower soil compaction in the 'VF tire tracks' at a depth of 0 to 40 cm. This effect was even significant at a depth of 20 to 25cm", reported Henning Sjørslev Lyngvig.

According to these independent results, and as further proof of the positive effects, the maise yields in the tracks on 'VF tire plots' exceeded those in the tracks on the 'conventional tire plots' significantly by about 12.9 harvest units per hectare, i.e. by about 10 per cent. The conclusion of Henning Sjørslev Lyngvig was unambiguous: "In sum – and depending on the working width of the liquid manure spreader – the measured effects translate to measurable benefits for farmers in terms of yield increases between 1.5 and 2.2 per cent per hectare, and calculated profit gains due to higher yields and reduced tire slippage in the 'VF tire plots' between 21.8 and 32 EUR per hectare. Farmers who use these tires on a 100-hectare field will achieve several thousand euros savings. Moreover, the experiment showed that VF tires reduced the wheel slip by 4,4 per cent, which will undoubtedly lead to additional fuel savings."

This Danish study further supports an earlier French study by IRSTEA (Institut national de recherche en sciences et technologies pour l’environnement et l’agriculture) in 2020 on key characteristics of the Alliance 372 VF. With great results concerning fuel efficiency, traction, slip in soft soil and footprint, the Alliance 372 VF was a clear match for a comparable premium competitor's tire and outperformed all competitors' premium IF tires.

Holistic approach

Gerrit Vinkers, Customer Quality Improvement and Application Specialist at YOHT, explained the manufacturer's holistic approach to soil conservation, including the entire tractor-trailer or tractor-implement combination.

"The positive effects of tractor tires with VF technology that were developed and introduced by YOHT's Alliance brand in recent years are undisputed. And yet, in practice, they will be annihilated when tractors with VF tires are followed by trailers or implements with standard tires, featuring an inflation pressure of 2 to 4 bar in the field. If, however, the entire machinery combination is equipped with VF tires, involving tires like the Alliance A389 VF-IMP that is capable of inflation pressures down to 0.8 bar in the field, this will bring decisive benefits in terms of lower impacts on the soil – resulting in higher yields!"


Convincing customer feedback

In addition to Alliance 372 VF, the unique Agri Star II radial tractor tire is particularly popular with customers. With 12 additional sizes, a total of 70 sizes is now available throughout YOHT's distribution network across Europe. "We can see with pride that our customers in different countries, highly appreciate and value the Agri Star II and give very positive feedback via our field engineers, representatives and distribution partners", said Angelo Noronha and continued: "We are particularly pleased that they recognise clear advantages when comparing the Agri Star II to tires of other brands that they used previously. Traction, durability and stability being at the top of the list of characteristics that are mentioned – and particularly appreciated – by owners and operators."

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