Maize ranges, world             wide, 3 rd from the point of view of the areas cultivated, after wheat and rice (Muntean et al., 2001; Cristea, 2004) and 1 st from the point of view of the production (Troyer, 2006). The area under study is part of the Aradului Plain and is characterised by very good vegetation conditions for maize and is also part of the very favourable cultivation area in Romania. This position , in terms of agriculture, is motivated by a number of features, such as: have a large production capacity by about 50% higher compared to other cereals, has a high ecological plasticity (MUNTEAN et al., 2001 ) is a plant hoes, good run for most crops, monoculture supports many years, has a high coefficient of multiplication (150-400), with a later planting in the spring, allowing a better staging of the agricultural work, culture is 100% mechanized, harvesting is done without danger of shaking, after the early run can be cultivated as second crop, which provides an additional crop of green mass, silage, or grain, is resistant to drought and falling, is less attacked by diseases and pests can be grown on soil and climate conditions very different (CAMPEANU S., 2009). The general goal of the research aims at analysing the behaviour of an assortment of maize hybrids developed by the Pioneer Company from the point of view of the production levels. In general, production per unit of area responds to density changes. To get maximum yields per unit of area, optimal cultivation density differs from one hybrid to another. The present research aims at determining optimal density with impact on production is six Pioneer hybrids in the soil and climate conditions of the Aradului Plain (Şemlac, Arad County). Results of this study are part of a doctoral program, with the theme: "Research on the influence of sowing density on production and its quality from 6 corn hybrids, climatic conditions of Plain Arad" scholarship program funded by the European Social din Pilot Program Fund to support research doctoral scholars, under contract POSDRU/6/1.5/2 USAMVB Timisoara, under the distinguished University Professor Dr. Valeriu Tabără.

yield, fertilization, maize hybrids, density

Presentation: oral