ពិភពលោក·ក្សេត្រសាស្ត្រ·ពូជដំឡូងថ្មី

សកលលោក៖ ហេតុអ្វីបានជាដំឡូងដែលផ្តល់ទិន្នផលខ្ពស់អាចបាត់បង់តម្លៃ — ការងងឹតបន្ទាប់ពីចម្អិនអាចដុះលូតលាស់នៅក្នុងកន្លែងផ្ទុក

លោក Viktor Kovalev 29 កញ្ញា 2026 អាន 3 នាទី

ដំឡូងឆ្អិនមួយ — Photo: A boiled potato (illustrative). Daderot / Wikimedia Commons, CC0

ការចំណាយដ៏សំខាន់។

2 acids decide darkening: chlorogenic versus citric acid
2000 and 2001 trials: Russet Burbank darker than Shepody
14 elements tested; P, Ca, Cu and Mg linked most to ACD
2.5% tuber potassium gives most citric acid, says K+S

ហេតុអ្វីវាសំខាន់

សម្រាប់កសិករ: មុននឹងជ្រើសរើសពូជដំណាំលើតុ សូមសាកល្បងស្ងោរសំណាកនៅរដូវស្លឹកឈើជ្រុះ និងចុងរដូវរងា។ តាមដានប៉ូតាស្យូម និងប្រភេទដី ហើយសួរអ្នកបង្កាត់ពូជអំពីទិន្នន័យពណ៌ខ្មៅបន្ទាប់ពីការផ្ទុក។
សម្រាប់ដំណើរការ: ម៉ាស៊ីនកែច្នៃចៀន៖ ពូជខុសគ្នាក្នុងការធ្វើឱ្យងងឹត; អាស៊ីតសូដ្យូម pyrophosphate ជួយបានមួយផ្នែកប៉ុណ្ណោះ ដូច្នេះសូមពិនិត្យមើលវត្ថុធាតុដើមតាមពូជ និងរយៈពេលផ្ទុក។
សម្រាប់ពាណិជ្ជករ: អ្នកវេចខ្ចប់ និងអ្នកជួញដូរ៖ សារធាតុពណ៌ខ្មៅដុះនៅក្នុងកន្លែងផ្ទុក; ធ្វើតេស្តស្ងោរលើដីឡូត៍និទាឃរដូវ មុនពេលលក់ទៅឱ្យអ្នកលក់រាយ ឬអ្នកទិញម្ហូបអាហារ។
សម្រាប់អ្នកផ្គត់ផ្គង់: Breeders and seed suppliers: publish after-cooking darkening scores after storage, not only at harvest.

សេចក្តីសង្ខេប ៦០ វិនាទី

Big yields lose value if the cooked potato goes grey or tastes bitter. Grey or black flesh after boiling comes from iron bound to chlorogenic acid, which oxidises once the potato cools; citric acid ties up iron and limits the effect. Canadian trials in 2000 and 2001 found variety mattered more than location, with Russet Burbank always darker than Shepody, and discolouration grew in both over the storage season. British work from 1967 linked worse results to fen soils poor in citric acid. A study of 14 minerals pointed to phosphorus, calcium, copper and magnesium, and a fertiliser company puts peak citric acid at 2.5% tuber potassium. Table potato growers and packers selling in spring are most exposed, and a boil test on stored samples is a cheap way to spot the problem early. The limitation: most studies are old or cover only a few varieties, and potassium claims come from a supplier.

2004Wang-Pruski and Nowak ACD review

1967Hughes and Evans fen vs clay field study

2000-2001Canadian trials, Russet Burbank vs Shepody

14elements tested in Nova Scotia study

2.5%tuber potassium for peak citric acid (K+S)

200 មីលីក្រាម / គីឡូក្រាមglycoalkaloid limit (separate article)

A high-yielding potato variety does not always pay. If boiled tubers turn grey or black on the plate, or taste bitter, buyers pay less or refuse the lot. Growers often see this in spring, when stored potatoes of such varieties sell at a discount. Two quality traits are behind most of these complaints: after-cooking darkening (ACD) and bitterness.

What causes darkening after cooking

ACD is “one of the most widespread, undesirable characteristics of cultivated potato”, according to a review by Gefu Wang-Pruski and Jerzy Nowak in the ទិនានុប្បវត្តិអាមេរិចនៃការស្រាវជ្រាវដំឡូង (2004). The flesh looks normal after boiling, but turns bluish-grey when it cools in the air. The cause is chemical. Iron in the tuber binds to chlorogenic acid, a natural phenol. After cooking, this iron compound oxidises and forms a dark pigment.

Citric acid protects the tuber, because it binds iron first. The review says the severity of darkening depends on the ratio of chlorogenic acid to citric acid: a higher ratio usually gives darker tubers. Both acids are controlled by genes, but they also change with the growing conditions.

សេចក្តីសង្ខេបឧស្សាហកម្មពេលព្រឹក ព័ត៌មានសំខាន់ៗប្រចាំថ្ងៃនៅក្នុងអ៊ីមែលតែមួយ។

ថ្ងៃធ្វើការ។ ឈប់ជាវដោយចុចតែម្តង។

Older field work in the UK showed the same. J. C. Hughes and J. L. Evans (European Potato Journal, 1967) grew several varieties on a black fen soil and a clay soil. Blackening was usually greater on fen soil, mostly because tubers had less citric acid. Year-to-year changes at one site were mainly due to weather.

Variety, field and store

Variety. In trials in New Brunswick and Nova Scotia in 2000 and 2001, Russet Burbank always showed more darkening than Shepody. The variety effect was stronger than the location effect, Wang-Pruski and co-authors reported (Acta Horticulturae, 2003).
Storage. In the same trials, darkening increased during storage in both varieties. This is why a variety can pass in autumn and fail in spring.
Nutrition. A Nova Scotia study of 14 elements found phosphorus, calcium, copper and magnesium most strongly linked to ACD. Darkening was worst at the stem end. Fertiliser maker K+S says citric acid rises with potassium supply and peaks when tubers contain 2.5% potassium; this is a company claim.

Processors can partly stop ACD in French fries with sodium acid pyrophosphate. Fresh-market buyers cooking at home have no such tool.

Bitterness is a separate problem. It is linked to glycoalkaloids, which rise when tubers are exposed to light; POTATOES NEWS covered this in a separate article on the 200 mg/kg limit.

ហេតុអ្វីវាសំខាន់

Yield is only one part of a variety’s value. For table potatoes, a variety prone to darkening can lose price after months in store. Before choosing a variety, growers can check official variety lists for cooking quality, ask breeders for ACD data after storage, and test boil samples in autumn and again in late winter. Soil type and potassium supply also deserve attention.

ប្រធានបទនេះត្រូវបានលើកឡើងដោយអ្នកអនុវត្តនៅក្នុងការជជែកតាមសារ MAX « КАРТОФЕЛЬ И Т.Д. (ដំឡូងបារាំងជាដើម)»ជាសហគមន៍មួយដែលមានអ្នកដាំដំឡូង និងអ្នកឯកទេសឧស្សាហកម្មជាង ១១០០ នាក់។ អ្នកចូលរួមមិនត្រូវបានបង្ហាញឈ្មោះទេ។ ចូលរួមការពិភាក្សា.

Photo: A boiled potato (illustrative). Daderot / វិគីមេឌាទូទៅ, CC0