Effect of Potassium Salt of Active Phosphorous on Growth, Yield and Quality Contributing Attributes of Soybean

An experiment was conducted to examine the effect of potassium salt and active phosphorus on growth, yield and quality contributing parameters in soybean crop during two consecutive years kharif 2018-19 and 2019-20. The experiment comprises of 9 treatments i.e., RDF+plant protection measure (T1); T1+ PSAP @ 4g/l (T2); RDF+50 % PPM (T3); T3 + PSAP @ 4g/l (T4); RDN+50 % P & K + PPM (T5); T5 + PSAP @4g/l (T6); RDN +50 % P, K + 50 % PPM (T7); T7 + PASP @4 g/l (T8) and RDN+PASP @ 4g/l (T9) . The experiment was carried out in alkaline nature of vertisols with soybean variety JS-2034 in randomized block design and replicated thrice. The plant protection measures includes quinolphos 25 EC @ 1L/h , Trizophos @ 0.8 L/h and propenophos @ 1.25 L/h during the crop period. The RDF of N: P: K: S @ 25: 60: 40: 40 kg/ha were applied as basal dose at the time of sowing through straight fertilizers like urea, SSP, and MOP .The product potassium salt and active phosphorous (PSAP) was applied as a 1^st spray of PSAP @ 4g/l, 40 DAS at Pre-flowering stage, 2^nd spray at 55 DAS and 3^rd Spray 70 DAS, simultaneously. The recorded data showed the maximum plant height (70.3cm) was observed in T2 (RDF+PPM+PSAP) while minimum (66.9 cm) in T9 (RDN and PSAP). The similar trends were also observed for number of pods per plant, number of grain per plant, weight of grain per plant, yield per plot, respectively. The maximum yield 11.44 q/ha was recorded with application of PSAP along with RDF and plant protection measures while the minimum yield was noticed in case of PSAP application with RDN only. Data of experiment revealed that application of potassium salt of active phosphorus on trypsin inhibitor activity was higher (8.34 mg/g) in T 2, the minimum White flies (2.97 leaf /plant)was recorded in T1(RDF+PPM) while maximum (4.63 leaf / plant) in T9. The lower infestation of Girdle beetle (0.92 mrl) and semilooper (0.69 mrl) were found in T2 while higher in T9, may be due to vegetative foliage. It was observed that the RDF +PPM and PSAP have slight significant impact on insect pest control in soybean crop.