CU LTIVATION AND TECHNOLOGY Control of hormone regulation in potato plants with right knowledge and resources hormone regulation. With that knowledge, you can start using products that can restrict or stimulate hormone production. These products also contain certain minerals that serve to support the product and not directly as nutrients for the plant.’ Product can break through dormancy The gibberelline hormone plays an important role in breaking dormancy, Schriever takes as an example. Stoller has the Vigor Seed product available for this purpose. ‘We also did some tests with that. What you see here are the effects on varieties. Four varieties don’t show a positive result after application in combination with nitrate, but Innovator does. With this, the tuber count is as much as 42 percent higher than in the untreated area. We did the same with urea and we saw a completely different result. Innovator, Marquis and Jelly all had a higher yield and a higher number of tubers. What we can provisionally conclude from the trial is that Vigor Seed can break the dormancy of certain varieties. Furthermore, the effect is different when fertilising with nitrate and urea.’ More root growth through extra cytokinine production All-in-all, Agro-Sud has tested a range of Stoller products, both in the trial field and in practice. For example, fields have been treated with Citocalcium. This was on Innovators that were planted too far apart and Hansas that had been planted too late and their haulm failed to close in the row. Citocalcium promotes the production of the hormone cytokinine, which in turn stimulates root growth and the aim was to see if this was enough compensation for the over large planting distance and This graph of Stoller’s shows the hormone fluctuations in the potato plant. Knowledge about this process makes it possible to adjust the hormone balance for a better harvest result. haulm development. Agro-Sud is also following a practical test in the Royal variety in which too much nitrate was used. The tubers remained too small and that’s why Bioforge was used here. This product reduces the production of the stress hormone ethylene in the plant that reduces the supply of nutrients to the tuber. What follows is many years of trials in order to also get an idea of the annual influences, Schriever says. ● Leo Hanse All-in-all, Agro-Sud has meanwhile tested a range of Stoller products, both in the trial field and in practice. Potato World 2019 • number 1 25 Pagina 24
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