A Comparative Study of Plant Growth Regulators on Morphological, Seed Yield and Quality Parameters of Greengram.

A field experiment was conducted to study the different growth regulating compounds on morphological, quality and yield parameters in greengram at Acharya N.G Ranga Agricultural University, Hyderabad during rabi 2009- 10. The basic material for the present investigation consists of Greengram cv WGG-37 and two growth promoting (NAA and Brassinosteroid) and growth retarding substances (Chlormequat chloride and Mepiquat chloride). These growth regulators were sprayed at flower initiation stage. The morphological traits viz., plant height, number of branches per plant, number of trifoliates per plant and days to 50% flowering and maturity were significantly increased by NAA @ 20 ppm, whereas total dry matter production (TDM) over growth regulator treatments at all stages NAA (20 ppm) and brassinosteroid (20ppm) recorded significantly higher values. Among the quality parameters highest seed protein content (%) and highest nitrogen harvest index values were recorded with growth retarding substance chlormequat chloride (187.5 g a.i ha-1) in greengram. The seed yield increased significantly with NAA (20 ppm) followed by mepiquat chloride 5% AS, brassinosteroid (20 ppm), chlormequat chloride (137.5.5 a.i/ha).