2019•International Journal of Chemical StudiesOpen access
Studies on influence of biofertilizers and NPK on nutrient uptake and production economics of carrot
P. Roshni, N. Krishna Murthy, K Uma Jyothi, Salomi Suneetha
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Abstract
The investigation was carried at Horticultural Research Station, Dr. Y. S. R. Horticultural University, Andhra Pradesh during Rabi 2017-18 to study the effect of different levels of biofertilizers and NPK on nutrient uptake and production economics of carrot. Two factors were taken, the first factor being the chemical fertilizers at three levels (100%, 75%, 50% of RDF) and the second factor was the different combinations of five biofertilizers (PSB, KSB, Azospirillum, Azotobacter, VAM). Factorial RBD with 12 treatment combinations was adopted. The results revealed that, treatment with chemical fertilizers at level 100% RDF (75:60:50 kg/ha) recorded the highest uptake of nitrogen (121.71 kg/ha), phosphorous (14.06 kg/ha) and potassium (223.56 kg/ha) by the plant. Treatment with biofertilizers PSB+ KSB+ Azospirillum+ Azotobacter+ VAM recorded highest uptake of nitrogen (120.64 kg/ha), potassium (226.74 kg/ha) uptake and plants applied with PSB+ KSB+VAM recorded the highest phosphorous uptake (14.17 kg/ha). The combined application of 100% RDF+PSB+ KSB+ Azospirillum+ Azotobacter+ VAM recorded highest nitrogen (133.21 kg/ha), potassium (239.28 kg/ha) uptake and highest phosphorous uptake (15.35 kg/ha) with the application of 50% RDF +PSB+ KSB+VAM. Economics plays a crucial role in deciding the adoption of any treatment, the highest cost to benefit ratio of 3.04 was obtained with the application of 100% RDF+ PSB+ KSB+ Azospirillum+ Azotobacter+ VAM followed by the treatment of 100% RDF+ PSB+ KSB+ Azotobacter with 2.87.