Portal de Periódicos da CAPES

High plant population of corn with reduced row spacing in second season.

2014; Volume: 13; Issue: 3 Linguagem: Inglês

1980-6477

José Salvador Simoneti Foloni, Juliano Carlos Calonego, Tiago Aranda Catuchi, N. A. Belleggia, Carlos Sérgio Tiritan, Alexandrius de Moraes Barbosa,

Soil Management and Crop Yield

The aim of this study was to evaluate the performance of different maize cultivars due to the variation in plant population in reduced row spacing. Two experiments were conducted, the first off-season in 2005 in the municipality of Atalaia, PR (Exp1), and the second off-season in 2007 in the municipality of Alvorada do Sul, PR (EXP2). Both were conducted in crops managed under no-tillage system after crop soybean using 0.45cm row spacing. The randomized complete block design with four replications was adopted in two experiments (Exp 1 and Exp 2). In Exp 1 the factorial design 2x4 was used (two maize cultivars, AG 9010 and DKB 979 installed with four populations: 39,000, 52,000, 79,000 and 105,000 plants ha-1). In Exp2 the 4x4 factorial design was used (four maize cultivars, AG 9010, DKB 350, Impact and Maximus and four populations, 39,000, 52,000, 79,000 and 105,000 plants ha-1). The Cultivar AG 9010 responded significantly to the increased plant population only in Exp 1, reaching maximum yield of about 70-80 thousand plants ha-1. The DKB 979 cultivar showed highest yield when grown with about 70-75 thousand plants ha-1. The DKB 350, Maximus and Impact cultivars cannot tolerate higher population of plants, with better performance using the traditional recommendation of 45-55 thousand plants ha-1. Impact and Maximus cultivars presented higher plant lodging with the population increase.