Sowing densities and NPK and liming rates for common bean (cv. Iapar 81) on clayey latosol of Ponta Grossa, Parana State, Brazil

Abstract

With a view to studying the most adequate plant populations and levels of fertilization and liming to the bean crop cultivar IAPAR 81, a field experiment was conducted on a clayey Latosol of Ponta Grossa, Paraná State, Brazil, at the summer sowing season. The experimental design was randomized blocks in a 4 x 4 factorial scheme involving four plant populations (100, 200, 300 and 400 thousand plants ha-1) and four rates of fertilization and liming (0.0; 0.5, 1.0 and 1.5 of the recommended doses) with four replicates. Plant height, grain yield, pod number per plant, grain number per pod and 100 grain-weight were determined. It follows that both, fertilization plus liming and high plant population resulted into higher yields. The maximum economical efficiency was obtained from fertilizer and limestone amounts equivalents to those of the refference dose.