Population density and row width effects on yield and agronomic attributes of lentils
1986
Mozahar, A.
A field experiment was conducted at the ICARDA sub-station in Terbol, Lebanon, to determine the effect of four population densities (100, 200, 300 and 400 plants/m2) and four row widths (20, 30, 40 and 50 cm) in a factorial combination on yield and agronomic attributes of lentils. Increasing the population density caused an increase in the height of the first pod bearing node, plant height, lodging leaf area index (LAI), shoot dry weight, number of nodules per plant and the biological yield of the crop while days to flowering and maturity, number of secondary branches and peduncles per plant, harvest index, relative growth rate (RGR) and net assimilation rate (NAR) decreased. With the higher population densities the crop growth rate (CGR) was higher at the early sampling dates and lower with the late sampling dates. Wider row spacing caused a decrease in all the variables measured except nodule weight per plant, pods per peduncle, seeds per pod, 100-seed weight and the harvest index which remained unaffected. LAI and shoot dry weight increased with a wider row spacing only at the early sampling dates but later on showed a declining trend. A population density of 200 plants/m2 with the lowest row width (20 cm) resulted in the highest grain yield (1.84 t/ha). Peduncles per plant among the primary yield components was highly correlated with grain yield.
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