A Vietnamese-language paper with an English abstract tested five nitrogen rates and five planting densities on VNUA38, an anthocyanin-rich cherry tomato bred at VNUA, in two seasons at Gia Lam, Hanoi. Treatment P4M3 (170 kg N/ha, 70 × 50 cm) gave the highest harvested yield in both seasons (27.31 and 23.46 t/ha), and total anthocyanin content stayed at 4.66–4.75 mg/100 g fresh weight across treatments.
Source: Vietnam Journal of Agricultural Sciences 24(10), 1354–1363; published 30 October 2026