title: Influence of plant population and nitrogen-fertilizer at various levels on growth and growth efficiency of maize.
abstract: Field experiments were conducted to evaluate plant population and N-fertilizer effects on yield and yield components of maize (Zea mays L.). Three levels of plant populations (53000, 66000, and 800,000 plants ha⁻¹ corresponding to spacings of 75 × 25, 60 × 25, and 50 × 25 cm) and 4 doses of N (100, 140, 180, and 220 kg ha⁻¹) were the treatment variables. Results revealed that plant growth, light interception (LI), yield attributes, and grain yield varied significantly due to the variations in population density and N-rates. Crop growth rate (CGR) was the highest with the population of 80,000 ha⁻¹ receiving 220 kg N ha⁻¹, while relative growth rate (RGR) showed an opposite trend of CGR. Light absorption was maximum when most of densely populated plant received the highest amount of N (220 kg N ha⁻¹). Response of soil-plant-analysis development (SPAD) value as well as N-content to N-rates was found significant. Plant height was the maximum at the lowest plant density with the highest amount of N. Plants that received 180 kg N ha⁻¹ with 80,000 plants ha⁻¹ had larger foliage, greater SPAD value, and higher amount of grains cob⁻¹ that contributed to the maximum yield (5.03 t ha⁻¹) and the maximum harvest index (HI) compared to the plants in other treatments.
authors.affiliation: Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan ; Department of Crop Botany, BSMR Agricultural University, Salna, Gazipur 1701, Bangladesh.
authors.forename: M I
authors.initials: MI
authors.lastname: Tajul
authors.forename: M M
authors.initials: MM
authors.lastname: Alam
authors.forename: S M M
authors.initials: SM
authors.lastname: Hossain
authors.forename: K
authors.initials: K
authors.lastname: Naher
authors.forename: M Y
authors.initials: MY
authors.lastname: Rafii
authors.forename: M A
authors.initials: MA
authors.lastname: Latif
mesh_terms: D000383:Agriculture; D005308:Fertilizers; D009584:Nitrogen / Q000378:metabolism*; D003313:Zea mays / Q000254:growth & development* / Q000378:metabolism
chemical_list: D005308:Fertilizers; D009584:Nitrogen