An on farm testing on effect of foliar application of vegetable special on growth and yield of potato was conducted in farmers’ field of Hassan district in five locations during 2015 and 2016 through Krishi Vigyan Kendra, Kandali, Hassan, University of Agricultural Sciences, Bengaluru. The results of the two years pooled data (2015 and 2016) revealed that foliar applications of vegetable special @ 5g/lit recorded significantly higher yield (103.95q/ha) and the lowest yield was recorded in farmers practice (91.3q/ha). However foliar application of vegetable special @ 3g/lit (98.1q/ha) was on par with recommended practice (95.1q/ha). The increase in yield was 13.85 percent with foliar application of vegetable special @ 5g/lit along with recommended dosage of fertilizer compared to farmers practice. Recommended practice and alternate practice-1 recorded 5.96 percent and 9.07 percent increase in yield compared to farmers practice. The similar trend was observed with respect to yield parameters of potato. However, significantly higher number of tubers and tuber weight was recorded with RDF+ foliar spray of vegetable special @ 5g/lit (9.7 and 1.46 kg) compared to farmers practice (4.5 and 0.62kg). Lowest number of tubers per plant and tuber weight was recorded in farmers’ practice (4.5 and 0.62). However similar number of tubers and tuber weight was recorded with recommended practice (5.6 and 0.81kg and alternate practice-2 (7.7 and 1.18kg). The maximum total number of tubers were recorded in alternate practice-2 (107.35) followed by alternate practice-1 (102.0). However, number of tubers per square meter was on par with farmers’ practice (90.67) and recommended practice (97.9). As regard to micronutrient content in tubers higher concentration of Zn, Cu, Mn, Fe, B and Mo were recorded in the treatment where foliar application of vegetable special @ 5g/lit along with RDF (22.2, 8.3, 21.5, 25.0 and 16.6) than recommended practice and farmers practice. With respect of economics of crop the higher B: C ratio was recorded with Alternate practice-2 + RDF (1:2.44) followed by alternate practice-1 (2.30) and recommended practice (2.26). The lowest B: C ratio was recorded in Farmers practice (2.23).

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