Assessing the impact of different bio-stimulant dosages on growth and development of guava (<i>Psidium guajava </i>L.) cv. Sardar

The field experiment was conducted at the Instructional Farm, Department of Fruit Science, College of Horticulture and Forestry, Jhalawar (Agriculture University, Kota) during 2020-21 to assess the impact of different bio-stimulant dosages on growth and development of guava (Psidium guajava L.) cv. Sardar. Nineteen treatments, including three bio-stimulants-Humic acid, Seaweed and Silicon applied through soil drenching, were examined in a triple-replication, randomized block design. The study revealed that bio-stimulants, particularly T12 (Humic acid 15 g + Seaweed 60 g), significantly enhanced various growth and development parameters of guava cv. Sardar. Plant height, canopy spread (E-W and N-S), rootstock and scion girth, leaf nutrient content (N P K), number of leaves per plant, relative water content and proline levels were among these metrics. The treatment T12 also showed favourable effects on the biological and physico-chemical characteristics of the soil. The results imply that some biostimulants, particularly the combination of seaweed and humic acid in T12, can be used as useful agronomic instruments to lessen the negative impacts of nutrient constraint on guava production. This study offers insightful information about how biostimulants could be used to maximize crop yield under difficult nutritional circumstances.