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Direct seeding compromised the vitamin C content of baby vegetables and the glucosinolate content of mature vegetables in Asian leafy brassicas.
Food Chemistry 2023 October 18
This study hypothesised that direct seeding may compromise the nutritional quality of crops, as they may not release the nutrients that are triggered by the stress of transplantation. To that end, the effect of direct seeding on the nutrient content of bok choy (Brassica rapa subsp. chinensis), choy sum (Brassica rapa subsp. chinensis var. parachinensis) and mao bai (Brassica oleracea var. capitata) was investigated at the baby- and commercially-mature stages. Direct seeding had distinct effects on each stage. Directly seeded baby vegetables had 39 to 51 % less ascorbic acid and 21 to 30 % less vitamin K than transplanted baby vegetables (p < 0.05). For mature crops, direct seeding decreased the total glucosinolate content by 12 to 40 % (p < 0.05). Thus, while direct seeding may profit vegetable producers, its impact on nutrient quality merits careful consideration.
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