Effect Off Moisture Regimes and Phosphogypsum Levels on Yield, Nutrient Uptake and Soil Nutrient Balance of Rabi Groundnut

The field experiment was conducted at College farm, Acharya N.G. Ranga Agricultural University (now Professor Jayashankar Telangana State Agricultural University), Rajendranagar, Hyderabad during rabi 2013–14 to study the influence of three moisture regimes viz., 0.6, 0.8 and 1.0 IW/CPE ratios and five phosphogypsum levels viz., Control (500 kg ha⁻¹ gypsum at flower initiation), Phosphogypsum @ 250 kg ha⁻¹ at flower initiation, Phosphogypsum @ 250 kg ha⁻¹ (½ as basal and ½ at flower initiation), Phosphogypsum @ 500 kg ha⁻¹ (½ as basal and ½ at flower initiation) and Phosphogypsum @ 500 kg ha⁻¹ at flower initiation and was replicated thrice. Among moisture regimes highest yield, nutrient uptakes were obtained with I₃ (1.0 IW/CPE) moisture regime but highest available nutrients in soil after harvest of groundnut were recorded with I₁ (0.6 IW/CPE) moisture regime. Among phosphogypsum levels highest yield, nutrients uptake and available nutrients in soil after harvest of groundnut were obtained with Pg₅: Phosphogypsum @ 500 kg ha⁻¹ at flower initiation.

Scheduling irrigation at I₃ (1.0 IW/CPE) and phosphogypsum @ 500 kg ha⁻¹ at flower initiation resulted in higher yield attributes, yields and uptake of nutrients in rabi groundnut under semi-arid climate of Hyderabad.

After harvest of rabi groundnut the highest final soil nutrients (i.e., Nitrogen, Phosphorus, Potasium, Sulphur and Calcium) were recorded under scheduling irrigation I₁ (0.6 IW/CPE) and among phosphogypsum levels the highest final soil nutrients were recorded under phosphogypsum @ 500 kg ha⁻¹ at flower initiation.