Effect of phosphorus and biofertilizers on phosphorus use efficiency, biological N-Fixation and yield of pigeonpea(Cajanus cajan L.)

摘要

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 studythe effect of phosphorus and biofertilizers on phosphorus use efficiency (PUE) and biological N-fixation (BNF) yield of pigeonpea (Cajanus 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 P . 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 P2Os/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 soilwas maximum (230 kg/ha).