GANGADHAR NANDA*, NILANJAYA AND A. K. S. YADAV
AICRP on Forage Crops and Utilization
Dr. Rajendra Prasad Central Agricultural University, Pusa-818425 (Bihar), India
*(e-mail : gnanda@rpcau.ac.in)
(Received : 19 September 2022; Accepted : 30 December 2022)
SUMMARY
A field investigation was undertaken at AICRP on Forage Crops and Utilization, Dr. Rajendra Prasad Central Agricultural University, Pusa during Rabi season, 2021-22 to study the response of berseem genotypes to different P levels. The experiment was conducted in split plot design with four genotypes (BM-14, JB-07-15, Wardan (national check) and BB-3 (zonal check)) and three phosphorus levels (60, 80 and 100 kg P2O5/ha) with three replications. The results revealed that genotype JB-07-15 recorded 19.3, 24.3 and 24.3% higher green forage yield (GFY), dry matter yield (DMY) and crude protein yield (CPY), respectively than national check and 24.0, 25.9 and 25.8% higher GFY, DMY and CPY, respectively than zonal check. Similarly, application of 100 kg P2O5/ha recorded 8.9, 17.5 and 20.3% higher GFY, DMY and CPY, respectively than application of 60 kg P2O5/ha. Among genotypes, JB-07-15 had the highest partial factor productivity of P fertilizer (PFPP) in term of GFY (600.4 kg GFY/kg P2O5 applied) and DMY (87.8 kg DMY/kg P2O5 applied) while application of lower dose of P (60 kg P2O5/ha) recorded the highest respective PFPPs (661.3 kg GFY/kg P2O5 applied and 92.4 kg DMY/kg P2O5 applied). Among genotypes, the highest net return (Rs. 68543/ha) and BC ratio (2.45) was achieved with genotype JB-07-15. Among P levels, application of the highest dose (100 kg P2O5/ha) registered the highest net return (Rs. 59681/ha) and BC ratio (2.24). The calculated agronomic maximum and economic optimum dose of P2O5 was found to be 104.3 kg and 99.3 kg/ha, respectively.
Key words: Berseem, P levels, forage yield, profitability and phosphorus use efficiency