b'quantities of seed, let alone the dif- othersdidnotrespondtotreat- ratios,whichwouldbeadvanta-ficulty and inconsistent in calculat- ments.TakeforexampleSangregeousforincreasefryyieldon ingthecorrectpartspermillioncompared to Dark Red Norland. Allprocessed potatoes (Figure 4). (ppm). plantgrowthregulatortreatments Before you start using plant growthcausedSangretohaveaquickerWhatdoesthisallmean?Using regulators,youmustasktheques- emergence, increased stem numberplant growth regulators as a liquid tionofwhatareyoutryingto(Figure1),increasedtubercount,seed treatment can establish a stan-accomplishandwhatcompoundschangedthetubersizeprofileanddard usage rate. Plant growth regula-will be help you achieve that goal.slightlyincreasedyield(Figure2).torsmanipulatestemandtuber To help unravel this mystery, we setHowever, there were no differencesnumberandthiscanbeusedto up an experiment to test some dif- in Dark Red Norland from the treat- improvetubersizeprofileforthe ferent commercial plant growth reg- ments applied. This is a good exam- desired use. Plant growth regulator ulators to see if we could define aple of how each cultivar has a differ- sensitivityistiedtocultivarand standard seed treatment method toentdose-responsetoplantgrowthseed age. If this is something inter-adjuststemandtubernumbertoregulators. Similarly, when we treat- estingtoyou,tryexperimenting improvetubersizeprofile,andtoedDakotaRussetandBannockwith different rates of plant growth identifywhichcultivarsrespondedRusset,weobservedchangesinregulators until you establish com-favorablytotheratesused.OurDakotaRussetbutnotBannockfortwithspecificratesoncertain treatments consisted of 1) non-treat- Russetyield(Figure3).Anothercultivars. edcheck,2)aseedtreatmentofinteresting response on certain cul-Stimulate (which contained 0.16 oztivars was improved length to width cytokinin/ton of seed + 0.09 oz gib-berellicacid/tonofseed+0.09ozPlease Come Enjoyindole-3-butyric acid/ton of seed, 3)Potato Golf Open 2022aseedtreatmentof0.05oz ProGibb/tonofseed+0.15ozand Potato Associate Day!Rejuvenate/ton of seed and 4) a seed treatment of 0.05 oz ProGibb/ton ofThursday, July 21st seed+0.15ozRejuvenate/tonof Fair Oaks Golf Course seed followed by a two foliar appli-cationofStimulate(0.05oz Grafton, N.D.cytokinin/a+0.03ozgibberellicQuestions? Contact the acid/a + 0.03 indole-3-butril acid/a)Northern Plains Potato at dime-sized tubers and 10-14 daysGrowers Association. after dime-sized tubers. We planted BannockRusset,DakotaRusset,218-773-3633IvoryCrisp,Atlantic,SangreandAll involved in the potato Dark Red Norland. industry are welcome! What did we find? The treatments did not always work because there was varietal sensitivity. Some culti-vars responded as we desired, while 14 POTATO GROWER APRIL 2022'