Abstract
The experiment was carried out with a view to study the response of plant bioregulators on growth parameters and plant growth analysis of onion at Regional Horticultural Research Station of Navsari Agricultural University, Navsari (Gujarat) during Rabi 2018 and 2019. The number of leaves per plant at 45 DATP (7.92), 60 DATP (8.75) and 90 DATP (9.42) and days to maturity (129.17) were found significant on pooled analysis basis under the treatment T1 (GA3 25 mg l-1). Among physiological parameters, treatment T1 (GA3 25 mg l-1) found best for leaf area index at 60 DATP (2.85), as well as harvest index (93.72) in pooled analysis. Crop growth rate at 60-90 DATP (5.11 g m-2 day-1) with T3 (GA3 75 mg l-1), net assimilation rate at 60-90 DATP (0.107 g cm-2 day-1) with T8 (GA3 25 mg l-1 + NAA 50 mg l-1) and biomass duration (1287.50 g days) with T2 (GA3 50 mg l-1) were found significant on pooled analysis basis.
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