Vol. 7, Issue 1 (2019)
The relative agronomic efficiency of rock phosphate and single super phosphate separately and in combination of phosphorous sources in maize-groundnut cropping sequence in an Alfisols
Author(s): Suraj Mali and GH Santra
Abstract: A field experiment was conducted with maize - groundnut cropping sequence. Rock phosphate and its combination with SSP were used as nutrient sources during Rabi 2016-17 (maize taken up in Kharif 2016). The study was carried out in the Central Farm, OUAT with the help of a field experiment laid out in Randomized Block Design with seven treatment T1 Control, T2 100% P(RP), T3 100% P(SSP), T4 75% P(RP) + 25% P(SSP), T5 50% P(RP) + 50% P(SSP), T6 25% P(RP) + 75% P(SSP) and T7 100% P(SSP) +Lime @0.2 LR and replicated in thrice. The soil of the experimental field was loamy acidic (pH 5.2) having Bray’s P of 15.68 kg ha-1. The different combinations with SSP were evaluated for their effectiveness in the cropping system. In addition to P applied @50 kg P2O5 ha-1 and 40 kg P2O5 ha-1 to maize and groundnut crops respectively from various sources, N was added @ 150 kgha-1 to maize and 20 kgha-1 to groundnut crop in the form of urea and K @50 and 40 kg K2O ha-1 was added to maize and groundnut crop in the form of MOP. Highest maize grain yield (5.03 t ha-1) was produced due to addition of 100%P (SSP) +Lime @0.2LR and highest pod yield (2.77 t ha-1) of groundnut was also due to 100%P (SSP)+Lime @0.2LR. The total biomass produced by cropping system ranged from 9.66 -18.82 (t ha-1) with control and 100% P (SSP) +Lime @0.2 LR. Combined maize and groundnut equivalent yield produced by cropping system ranged from 2072 - 5728 (kg ha-1) with control and 100% P (SSP) +Lime @0.2 LR. Apparent P recovery (62.52%) was highest in100%P (SSP) Lime @0.2LR for the cropping sequence. The same treatment also recorded the highest uptake of nutrients Phosphorous. The total phosphorus use efficiency of the cropping sequence was maximum (93) received in 100%P(SSP) +Lime @0.2LR. The highest Relative Agronomic efficiency of the cropping sequence(149) was recorded with 100%P(SSP) +Lime @0.2LR followed by RP:SSP(1:1) (139).
Pages: 2314-2317 | 311 Views 52 Downloads
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How to cite this article:
Suraj Mali, GH Santra. The relative agronomic efficiency of rock phosphate and single super phosphate separately and in combination of phosphorous sources in maize-groundnut cropping sequence in an Alfisols. Int J Chem Stud 2019;7(1):2314-2317.
