Wp?yw g?sto?ci siewu na plonowanie odmian kukurydzy o ró?nej klasie wczesno?ci

摘要

The aim of the investigation was to determine the response of sowing density on yielding of maize hybrids with different maturity class. The field experiment was conducted in 2009-2012 in the Department of Agronomy at the Poznań University of Life Sciences, in the fields of Experimental and Educational Center Gorzyń, Station in Swadzim. The analysed factor was variety: PR39D60 (FAO 210), PR39T45 (FAO 240), PR38N86 (FAO 280), PR38A24 (FAO 330). The second order factor was sowing density: 6, 7, 8, 9, 10 plants per 1 m2. The investigated hybrids were yielding at the same level: ranging from 103.1 to 105.3 dt·ha-1, except early hybrid PR39D60, which grain yield was significantly the lowest and amounted 89.6 dt·ha-1. Average for the four years of investigation, regardless of the variety, the highest yields were obtained at a density of 7 plants per 1 m2.