Soybean is a prospective oilseed crop in Bangladesh. Yield of soybean is lower than other countries due to proper dose and unplanned nutrient management. An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to evaluate the influence of sulphur and boron on the growth and yield of soybean (cv. Binasoybean-1). The experiment comprised three levels of sulphur (S) viz. 0, 20, and 40 kg ha-1 and four levels of boron (B) viz. 0, 1.0 kg B ha-1 as basal application, 0.5 kg B ha-1 as basal application + 0.5 kg B ha-1 as foliar application at pre-flowering stage and 0.5 kg B ha-1 as foliar application at 30 days after sowing (DAS) + 0.5 kg B ha-1 as foliar application at pre-flowering stage. The experiment was laid out in a randomized complete block design with three replications. At 75 days after sowing, the tallest plant (43.93 cm), maximum branches plant-1 (3.43), SPAD value (28.70), number of nodules (18.80) and dry weight of nodules plant-1 (0.17 g) were recorded in 20 kg S ha-1 with boron 0.5 kg ha-1 as basal application + 0.5 kg ha-1 as foliar application at pre-flowering stage while nodule fresh weight plant-1 (1.65 g), plant fresh weight (42.73 g) and plant dry weight (6.89 g) were recorded in 40 kg S ha-1 with boron 1.0 kg ha-1 as basal application. Sulphur 20 kg ha-1 produced the highest seed (1.33 t ha-1) and stover (2.14 t ha-1) yields while control treatment provided the lowest yields. The highest number of branches plant-1 (3.20), pods plant-1 (30.52), seeds pod-1 (3.44 ), seed (1.27 t ha-1) and stover (2.15 t ha-1) yields were obtained at 0.5 kg B ha-1 as basal + 0.5 kg B ha-1 as foliar application at pre-flowering stage while the lowest values were found in control treatment. In interaction, the highest seed (1.63 t ha-1) and stover (3.15 t ha-1) yields were obtained with 20 kg S ha-1 and 0.5 kg B ha-1 as basal + 0.5 kg B ha-1 as foliar application at pre-flowering stage while the worst yield performance was observed in control treatment. Therefore, application of sulphur @ 20 kg ha-1 along with 0.5 kg B ha-1 as basal + 0.5 kg B ha-1 as foliar application at pre-flowering stage could be applied for Binasoybean-1 for higher seed yield.
Key words: Sulphur, boron, soybean, growth, yield
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