Vol. 8, Issue 6 (2019)

Author(s):
RG Chawhan, HS Deshmukh and RV Chahande

Abstract:
The field experiment was conducted at Post Graduate Institute Farm, Mahatma Phule Krishi Vidyapeeth, to study the effect of growth regulators and spraying stages on flower drop, pod setting, seed yield and quality in pigeonpea Cv. Vipula; was conducted under field conditions. Further, the laboratory experiment was also conducted in the Seed Technology Research Unit, Mahatma Phule Krishi Vidyapeeth, Rahuri during 2015-16 and 2016-17. The field experiment consisted of 12 treatment combinations involving six growth regulators as main factor viz., T₁- Control, T₂- 1-Naphthaleneacetic acid (NAA) @ 0.5ml/L, T₃- Indole-3-acetic acid (IAA) @ 50 mg, T₄- Diammonium phosphate (DAP) @ 2%, T₅- Urea @ 1%, T₆- Potassium nitrate (KNO₃) @ 2% and two spraying stages as sub factor viz., S₁- At initiation of flowering and S₂-15 days after 1st spraying. The plants sprayed with NAA @0.5ml/l (T₂) have recorded consistently more number of pods per plant (439.28), pod yield per plant (122.04 g), pod yield per hectare (3813.83 kg), seed yield per plant (83.59 g) and seed yield per hectare (2612.03 kg) as against control (408.9, 112.33 g, 3510.39 kg, 73.80 g and 2306.33kg, respectively) followed by IAA @ 50 mg (429.04, 119.34 g, 3729.45 kg, 82.48 g and 2577.58 kg). NAA @ 0.5ml/l (T₂) has out yielded over the rest of the growth regulators by registering 11.71 per cent increased seed yield per hectare over control. Spraying at initiation of flowering (S₁) shows better performance of yield per hectare (1.82%) than the (S₂) 15 days after 1st flowering. Similar effects were recorded for growth regulators sprayed at initiation of flowering stage and interaction effect.