Nabarka Blackspot waa walaac tayo leh iyada oo aan loo eegin suuqa warshadaha ee baradho ayaa loo qorsheeyay. Nabarka bar madow wuxuu dhacaa marka tuberka uu saameeyo xoog dibadda ah. Xooggan waxaa laga yaabaa inuusan jebin maqaarka, laakiin taa beddelkeeda wuxuu waxyeeleeyaa unugyada hoose. Nabarka Blackspot waxa uu samaysmaa marka unugyada dhaawacan ee phenolic-ga ay oksaydheeyaan enzyme polyphenol oxidase (PPO), kaas oo isna soo saara quinones (midabka casaanka), ka dibna isu beddela midab madow (melanin). Ka dib marka baradhada la diiriyo, unugyada dhaawacan waxay u muuqdaan meel madow ama madow.
Horumarinta aagga madow maaha mid degdeg ah waxayna qaadataa wakhti si ay u muuqato muuqaal. Madoobaadku waa mid aan laga noqon karin waxaana loo arkaa cillad baradhada cusub iyo habaynta labadaba. Saamayn ayaa loo baahan yahay si ay u keento nabar barta madow ku samaysma. Fikrad ahaan, sida ugu dhakhsaha badan ee aad uga warqabto xaaladaha ama qalabka keenaya saamaynta, sida ugu dhakhsaha badan ee aad u samayn karto isbeddel ama hagaajin si aad u yarayso suurtagalnimada nabarada barta madow. Diil baradhada si loo aqoonsado saamiga leh calaamadaha nabarka madow waxay noqon kartaa qalab weyn oo lagu garto meelaha lagu hagaajinayo xakamaynta nabarrada.
Si fudud u muunad baradhada meelo kala duwan marka la goosto, la maaraynayo iyo meel ka baxsan kaydinta, ama baakadaha ama gaadiidka ka dib. Xeerka guud ee suulka ayaa ah in baradhada lagu hayo 70F 24-48 saacadood ka dibna lagu qiimeeyo nabarada barta blackspot. Waqti gaaban (6-12 saacadood) heerkul sare oo ah 80-90F ayaa la isticmaalay si loo dedejiyo horumarka nabarada barta madow si loo ogaado goor hore. Talooyinkani waxay ku salaysnaayeen wakhtiga iyo heerkulka loo baahan yahay midabka madow ee ugu badan.
Su'aashu waxay tahay, miyaad heli kartaa fikrad wanaagsan oo ku saabsan heerka nabarada Blackspot (tusaale, midab ka yar) waqti gaaban gudaheed si aad u sameyso qalab ama wax ka bedel si dhakhso ah?
Daraasad ay dhawaan samaysay Jaamacadda Idaho ayaa go'aamisay haddii aad qiimeyn karto nabarrada wax ka yar 24 saacadood iyo adiga oo aan isticmaalin heerkul sare. Ujeedada ugu weyn waxay ahayd in wax laga qabto horumarka nabarada blackspot muddo 5 saacadood ah oo la barbar dhigo horumarka nabarka ka dib 24-saac ee Russet Burbank iyo Russet Norkotah. Pendulum-ka saamaynta leh ayaa lagu dejiyay meel hoos u dhac ah oo ah 7 ama 12 inches waxaana la gaadhsiiyay 4 nabaro labis ah baradho kasta.
Tubers waa la nabarray, waxaana la dhigay 70⁰ F (tusaale heerkulka qolka), ka dibna si muuqaal ah ayaa loo qiimeeyay nabarka barta madow ee 1, 2, 3, 4, 5, iyo 24 saacadood ka dib saamaynta. Midab-baxa, ugu horrayn midabka casaanka, ayaa bilaabay inuu horumariyo saacaddii ugu horreysay ka dib saameynta. Tusaale ahaan, Russet Burbank oo ay saamaysay hoos u dhac 12-inji ah ayaa muujisay 50% meelaha saamaynta ku yeeshay midab casaan ah 1 saac ka dib.
Isbeddelka midabka nabarrada ee casaanka ilaa bunni wuxuu dhacay ugu horreyntii 2 ilaa 3 saacadood ka dib saameynta, iyo midabka casaanka ayaa si degdeg ah hoos ugu dhacay wakhtigaas ka dib labadaba labadaba. Dhacdooyinka ugu sarreeya iyo darnaanta nabarrada madow waxay dhaceen 24 saacadood; si kastaba ha ahaatee, in ka badan 80% wadarta nabarrada ayaa la arki karaa 3 ilaa 5 saacadood ka dib taas oo ku xidhan awoodda saamaynta iyo beerashada. Meelaha madow ee madow waxaa lagu arki karaa wax ka yar 5 saacadood, laakiin midabka ugu badan ayaa weli qaadan doona ilaa 24 saacadood. Natiijooyinkani waxay muujinayaan awoodda loo isticmaalo nabarrada casaanka ah ama bunni/madaw sida tilmaame hore ee qiimaynta nabarrada gudaha qalliinka.
Midabadaan hoos loo dhigay ayaa laga yaabaa inay muujiyaan nabarrada ugu cusub waxayna u oggolaan karaan tilmaamida isha nabarka. Qiimaynta nabarrada waxay bilaabmi kartaa dhawr saacadood gudahooda ka dib muunada, mana aha lagama maarmaan in la sugo 24 saacadood. Sanduuq kulul looma baahna, laakiin isha wanaagsan si ay u aragto "hadhka" kala duwan ee nabarrada ayaa loo baahan yahay gaar ahaan nabarrada ay sababaan saamaynta hoose. Sida ugu dhaqsaha badan ee goobaha nabaradu u saamayso ayaa loo aqoonsaday isbeddellada degdega ah ee la samayn karo si loo hubiyo tayada ugu fiican ee baradhada.