An experiment was conducted to substitute mineral fertilizers with biofertilizers in strawberry to work out the yield, quality of strawberry and soil fertility. A 25% substitution of mineral fertilizer with biofertilizer increased the number of fruits/plant along with improving Juice content (89.55%), Total soluble solids (10.35°B), total sugar (6.69%), ascorbic acid (43.80 mg 100 g⁻¹), anthocyanin content (81.05 mg 100 g⁻¹), total phenol (5.97 mg Gallic acid equiv. g⁻¹), flavonoids (0.12 mg g⁻¹) and antioxidant capacity (2.13 µmol. Trolox equiv. 100 g⁻¹). The available N and K content in post-harvest soils were improved significantly with 75% RDF + Azospirillium @ 2 g plant⁻¹ + PSB @ 2 g plant⁻¹ + topdressing of 25% K treatments (200.10 and 211.70 kg ha⁻¹, respectively). Viable count of soil microorganisms (Bacteria, actinomycetes and fungi) was also estimated maximum (4066, 190 and 11.33 × 10⁴ cfu g⁻¹dry soil, respectively) with substitution of 25% of mineral fertilizer either with Azotobacter or Azospirillum.

The present investigation was carried out to study the efficacy of foliar feeding of brassinosteroid on growth, yield and quality of strawberry (Fragaria × ananassa Duch.) cv. Winter Dawn. The experimental finding revealed that the physiological growth in terms of leaf number, specific leaf weight, leaf relative water content and total chlorophyll content in the leaf has increased significantly in all the brassinosteroid treated plant with maximum in the treatment consist of three repeated foliar spray of brassinosteroid at vegetative, flowering and again at fruiting stage, irrespective of their concentration. Fruit yield (31.93 tonnes ha⁻¹) with earliest ripening (within 13.67 days after fruit setting) and biggest fruit size (18.43 cc) was obtained in the treatment of three brassinosteroid spray @ 0.2 ppm each at vegetative, flowering and fruiting stage. Further, total soluble solid (TSS): acid ratio and reducing sugar also was measured maximum (21.71 and 5.20%, respectively) in three repeated spray of brassinosteroid @ 0.2 ppm. Hence, it can be concluded that the foliar feeding of brassinosteroid @ 0.2 ppm each at vegetative, flowering and fruiting stage is the best treatment to increase the yield potentiality of strawberry cv. Winter Dawn with improved fruit quality under subtropical condition of Bihar, India.