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This study dealt with preparation and efficient utilization of may flower seed carbon (MFSC) to adsorb Fe (II) from aqueous solution. Batch experiments were conducted to analyze the impact of adsorption parameters viz, contact time, initial metal ion concentration, adsorbent dose and pH on adsorption process. The results revealed that iron removal increased gradually up to a maximum of 99.52% and removal attains maximum at 80 min. Complete removal of Fe (II) was observed at a dosage of 100 mg/50 mL of pH 6 and 80 min contact time. Experimental data were fitted with Langmuir, Freundlich and Dubinin –Radushkevich (D‐R) isotherm models and was observed to be better explained by Langmuir adsorption model. The monolayer adsorption was 49.75 mg g−1 of Fe (II) on MFSC and the adsorption process followed Pseudo second order kinetics; regeneration of carbon was possible with 0.3 M HCl. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S243–S249, 2019

To study the fertilizers and humic acid on nutrient uptake in Alfisol and Inceptisol, two field experiments were conducted during rabi 2001 with various levels of fertilizers and humic acid treatments. A large increase was recorded in the uptake of nutrients for the application of humic acid (HA) upto 40 kg ha'. The significant increase of N, P and K uptake were recorded upto 20 and 10 kg HA ha respectively in both Alfisol and Inceptisol. In the presence of humic acid, the effect of 75 and 100% NPK fertilizers on nutrient uptake and grain yield was comparable with each other.

With a view to study the influence of irrigation regimes at critical stages of sugarcane an investigation was carried out at Agricultural Research Station, Tamil Nadu Agricultural University, Bhavanisagar, India during Mid‐late season (March–April) using Co 6304 as test variety. Treatments consisted of eight irrigation regimes created by imposing two levels of irrigation 0.75 and 0.5 IW/CPE ratio at critical stages (tillering, grand growth and maturity). The results revealed that irrigating sugarcane at 0.75 IW/CPE ratio at tillering and growth and 0.5 IW/CPE at maturity phase recorded highest nutrient uptake, cane yield (139 t/ha) with 10.6 % CCS consuming 1791 mm of water the highest water use efficiency of 77.3 kg/ha mm.