1Department of N.R.M., M.G.C.G.V.V., Chitrakoot, Satna, M.P., India
2Department of Soil Science and Agri. Chemistry, J.N.K.V.V., Jabalpur, M.P., India
*Corresponding author: rameshwar_jan@rediffmail.com
Online published on 21 January, 2017.
A field experiment was conducted during rainy seasons of 2013–14 and 2014–15 at the Rajola Krishi Research Farm, Faculty of Agricultural Sciences, Mahatma Gandhi Chitrakoot Gramodaya Vishwa Vidyalaya, Chitrakoot-Satna, Madhya Pradesh, India to study the effect of phosphorus and biofertilizers on phosphorus use efficiency (PUE) and biological N-fixation (BNF) yield of pigeonpea Qajanus cajan L.) variety UPAS-120. The agronomical and physiological PUE and its recovery were found significantly higher (10.40, 44.83 and 13.09 respectively) under the lowest level of phosphorus (P30). The reserve was true in case of P90. Dual biofertilizers (Rhizobium + PSB) gave significantly higher physiological PUE over single biofertilizer; where as agronomical PUE and recovery were found identical. Application of phosphorus up to 90 kg P2O5/ha gave maximum grain yield (16.06 q/ha). The dual biofertilizers also gave maximum yield up to 15.56 q/ha. The BNF was highest in these treatments. Hence the N-balance in soil was maximum (230 kg/ha).
Application of P60 or P90 with Rhiz.+ PSB resulted in maximum N-up take by the crop (87.3 to 89.3 kg/ha). Consequently, the apparent N-balance was form lowest (13.77 to 139.7 kg/ha). Since both these treatment combinations resulted in highest biological N-fixation by the crop.
The highest P-level significantly increased all the yield attributes of pigeonpea as compared to the lower P-level.
The combined applications of Rhizobium +PSB augmented all these parameters almost significantly over Rhizobium alone and control treatment.
Biofertilizers, pigeonpea, yield, BNF, PUE, Rhizobium and PSB
