Efficiency of mixture of rockphosphate and superphosphate as an alternate phosphate source for French bean in acid soil

Relative efficiency of mixtures of Mussoorie rock phosphate (MRP), Lalitpur rock phosphate (LRP) with superphosphate (SSP) in the proportion of 1:1, 1:2 and 2:1 was studied in acid soil (inceptisol) during kharif. Mixture of RP+SSP in ratio of 2:1 at 60 kg P₂O₅/ha, recorded highest yield of french bean. This mixture was also superior to other phosphate mixtures i.e. 1:1 and 1:2 ratios regarding assimilation and uptake of N and P by French bean, fertilizer use effeciency (FUE), availability coefficient ratio (ACR), P use efficiency (PUE) and relative agronomic effectiveness (RAE) and maintained highest available P status of soil throughout the crop growth period. FUE and PUE was greater at 30 kg P₂O₅/ha level and declined at 60 kg P₂O₅/ha.