Response of different levels of nitrogen, phosphorus and sulphur on yield parameters and yield of soybean [Glycine max (L) merill]

A field experiment was carried out during the kharif season at the crop research farm of the Department of Agronomy, Allahabad school of Agriculture, SHUATS, Allahabad, Uttar Pradesh to evaluate the effect of different levels of nitrogen, phosphorus and sulphur on yield parameters and yield of soybean [Glycine max (L) Merrill]. The experiment was laid out in randomized block design and replicated thrice. The treatments consisted of different doses of nitrogen (30 and 45 kg/ha), phosphorus (40, 60 and 80 kg/ha), blanket application of potash (20 kg/ha) and sulphur (20 and 40 kg/ha). The treatment comprising nitrogen 45 kg/ha, phosphorus and sulphur at 40 kg per ha each along with a blanket application of potash at 20 kg/ha recorded highest number of pods per plant (34.77) which was at par with the treatment having nitrogen 45 kg/ha, phosphorus 60 kg/ha and sulphur 20 kg/ha (31.77). However, the treatment comprising nitrogen 45 kg/ha, phosphorus and sulphur at 40 kg/ha each recorded statistically maximum number of grains per pod (2.88) and seed yield (2,279.84 kg/ha).