Abstract
An experiment to investigate the effect of seed rate (5, 7.5, 10, 12.5 and 15 kg ha-1) and row spacing (30, 45 and 60cm) on agronomic characteristics of plants including stem densitym-2, plant height, stem diameter, number of heads m-2, number of heads per plant, number of grains per head, 1000-grain weight and grain yield was conducted using the cultivar “Sorghum 2011” for two years 2016 and 2017. Seed rates and row spacing had significant effect on plant height, plant density m-2, number of heads m-2, number of grains per head and grain yield. Row spacing had non-significant effect on stem diameter, number of heads per plant and 1000-grain weight. Row spacing at 30 cm produced the highest number of plants m-2 and plant height. Plant height increased with increase in seed rate in all the row spacing. Stem diameter decreased with increase in the seed rate and row spacing. Narrow row spacing (30 cm) and low seeding rate (5 kg ha-1) produced the maximum grain yield consistently during both years. Lower yields were recorded in the treatments having greater row spacing (60 cm) and higher seed rates (7.5, 10, 12.5 & 15 kg ha-1). Higher seed rates and wider row spacing induced morphological changes rendering plants to lodging.SAARC J. Agri., 15(2): 81-91 (2017)
Highlights
Seed rate and row spacing are important factors for crop establishment technique that affects the crop stand and other yield parameters in different crops
Significant differences among row spacing, seed rates and interaction of both the variables were found for number of grains per head, number of headsm-2, stem density m-2 and stem diameter in the combined results of two years (Table 1)
Row spacing primarily influences the number of plants m-2 and results of the grain yield are considered to be more dependent, or attribute of, plant to plant space using seed rate, row to row distance, different establishing techniques or the planting geometry etc
Summary
Seed rate and row spacing are important factors for crop establishment technique that affects the crop stand and other yield parameters in different crops. Lower plant density results in higher weed infestation, poor radiation use efficiency and lower yields. Plant population, on the basis of row spacing and seed rate, affects the crop stand, Accepted: 20.10.2017. Moench) development because it affects light capture, water use, grain yield, plant competition and other physical and biological processes (Krishnareddy et al, 2006). It has been reported that increase in plant population results in decrease in number of tillers (Pawlowski et al, 1993; Caliskan et al, 2007), plant height (Ayub et al, 2003) and stem diameter (Caravetta et al, 1990) but grain yield per unit area increased (Caliskan et al, 2007)
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