An experiment was conducted at the agronomy field of Bangladesh Agricultural University, Mymensingh to determine the effect of seed rate and fertilizer doses on yield components of lentil (Lens culinaris Medic). The experiment was laid out in randomly complete block design (RCBD) with three replications. Three doses of nitrogen fertilizer, viz. N1= 25 kg/ha, N2= 40 kg/ha, N3= 55 kg/ha and two seed rate, viz., S1= 35 kg/ha, S2= 45 kg/ha were used as experimental treatments. Result revealed that the highest yield (1.067 tha-1) was found in higher seed rate (S2-45 kgha-1). On the other hand, medium fertilizer dose (40 kgha-1 urea dose) confirmed the highest yield (1.1083 tha-1) of lentil. Furthermore, the highest lentil yield (1.20 tha-1) was recorded in S2N2 interaction. The study also concluded that yield was positively correlate with plant height, number of branches per plant and number of pods per plant but negatively correlate with days to maturity.

Key words: Lentil, seed rate, nitrogen, yield attributes

Introduction Lentil (Lens culinaris) is an important food source for the people especially in the subcontinent (Singh and Singh, 2014). It is originated mainly from the eastern Mediterranean Egypt, Greek & Asia then Hindukush Mountain in India and later stage in Africa, America & Europe (Al-Khayri et al., 2019).  It is rich in proteins and contains high concentrations of essential amino acids like isoleucine and lysine, as well as other nutrients like dietary fiber, folate, vitamin B1, and minerals (Rozan et al., 2001). Research showed that it contains 25% protein, 60% CHO, 4.5% fat and 11% water which are comparatively higher than the other pulse crops (Singh et al., 2016). It is grown as a sole crop and may be inter-cropped with wheat, mustard and chickpea (Biswas et al., 2020). Although lentil requires fertilizers however, it also plays important role to fix nitrogen to soil from the atmosphere (Suryapani et al., 2012). Bangladesh is an over populated country and cultivable land is decreasing day by day creating major problems for food. To get higher production from the available cultivable land resources, feasible conditions for cultivation are needed and the importance of nutrients in plant growth and yield are well known (Shrivastav et al., 2020). Nitrogen is one of the essential plant nutrients, which can augment the production to a great extent. Again, seed rate has a positive effect on total yield as well as with the net profit return (Boyer et al., 2020). Reports showed that combination of seed rate with fertilizer can increase the yield as well as protein content of barley and wheat seed (Walsh and Walsh, 2019). So, this experiment was undertaken to understand the combine effect of seed rate and nitrogen doses on the growth and yield of lentil.