What question did this study set out to answer?

The aim is to enhance fruiting attributes, yield, and quality of L-49 guava using nutrient applications.

April 24, 2026Open Access

Influence of Foliar Application of NAA, Zinc Sulphate and Calcium Nitrate on Flowering, Yield and Quality Attributes of Winter Season Guava

Key Points

The aim is to enhance fruiting attributes, yield, and quality of L-49 guava using nutrient applications.
Conducted in a randomized block design with three replicates.
Ten treatments were applied, including varying concentrations of NAA, ZnSO4, and calcium nitrate.
Assessment of flowering, fruit yield and quality metrics after application.
ZnSO4 at 1.0% increased flowering to an average of 59.60 flowers per shoot and fruit set to 59.73%.
Fruit yield rose to 56.84 kg per plant, with improved quality attributes including a pulp content of 96.56%.
Notable reductions in fruit drop to 41.67% and titratable acidity to 0.43% were observed.

Abstract

The present experiment was conducted from June to December, 2024 at Guava Orchard, Department of Fruit Science, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur, U.P., India. This study aimed to improve the fruiting attributes, physical attributes, fruit yield, and quality of the L-49 cultivar of guava. The experiment was laid out in RBD with three replicates of each treatment. Total 10 treatments including one control, viz., NAA at 25 ppm, NAA at 50 ppm, NAA at 75 ppm, ZnSO4 at 0.50%, ZnSO4 at 0.50 %, ZnSO4 at 0.75%, ZnSO4 at 1.0%, Calcium nitrate at 0.50%, Calcium nitrate at 1.0%, Calcium nitrate at 1.50%, and Control, i.e. water spray. The present investigation, it was reported that the application of ZnSO4 at 1.0% with significantly increased flowers (59.60) shoot-1, fruit set (59.73%), and decreased fruit drop (41.67%), increased fruit retention (58.33%), fruit weight (152.40 g), fruit length (7.68 cm), fruit width (7.25 cm), fruit volume (156.84 cc), specific gravity (1.19 g cc-1), and fruit yield (56.84 kg) plant-1, pulp (96.56%), pulp: seed ratio (28.14) and minimum number of seeds (253) fruit-1 and seed weight (5.23 g) fruit-1 and quality parameters like: TSS (12.09°Brix), total sugars (8.02%), reducing sugars (3.84%), non-reducing sugars (4.18%), and decreased titratable acidity (0.43%) content. Hence, plants treated with ZnSO4 at 1.0% could also be used to improve fruiting, overall yield, and quality characteristics of the L-49 cultivar of guava.

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