Vol. 11, Issue 11 (2022)

An experiment was conducted to study the response of foliar spray of seaweed extract at different pH levels on fruiting and yield of mango (Mangifera indica L.) cv. Kesar at RHRS, ACHF, NAU, Navsari during the year 2018-19 and 2019-20. Mango trees treated at induction of flowering and marble stage with three pH levels of spray solution namely, A1: 4.5 pH, A2: 5.5 pH and A3: Best available water and four concentrations of seaweed extract viz., S1: 1%, S2: 2%, S3: 3%, S4: 4%. All the twelve treatment combinations were repeated thrice. The individual effects of foliar applications of different pH levels of spray solution and seaweed extract treatments as well as their interactions on fruiting and yield of mango cv. Kesar were recorded. Results revealed that the foliar spray solution at pH 4.5 level and 1% seaweed extract were gave maximum fruiting characters of mango i.e. number of fruits at pea stage, fruit set (%) at marble stage, fruit set (%) at harvest stage and fruit retention individually. The same treatments were also gave maximum yield characters viz., number of fruits/panicle, numbers of fruits/tree, fruit yield (kg/tree and t/ha) and marketable fruit (kg/ha). Interaction of different pH levels with seaweed extract was found significant in case of fruit set (%) at marble stage, fruit set (%) at harvest stage, fruit retention (%) at harvest stage, number of fruits per tree, fruit yield (kg/tree and (t/ha) and marketable fruit (kg/ha) of mango during investigation, which were the maximum when mango cv. Kesar trees treated with 4.5 pH level of 1% seaweed extract at induction of flowering and marble stage.