Summary:

The influence of drip irrigation and two nitrogen fertilization doses on the height and quality of grain yield of maize cultivars Cedro and Smok was deter-mined in a field experiment carried out in the years 2006-2008 on very light soil at Kruszyn Krajenski, near Bydgoszcz. Results of the experiment have proved that drip irrigation was the basic yield creating factor without which maize cultiva-tion would have been failed while only dependent on the rainfall in June and July. Low yielding of non-irrigated plants caused a high productive effects of the treatment. The average increment of irrigated corn yield was 4,77 t.ha^-1(221%) and the efficiency of 1 mm of irrigated water had a mean of 34,9 kg.ha^-1. Double dose of nitrogen fertilization used on irrigated plots caused an increase of grain yield of corn (in average of 11%), an increase of the DM grain of corn and pro-tein in grain and decreased the grain moisture content during harvesting. The re-sults of the study and of some previous works have shown, that drip irrigation used instead of sprinkler irrigation cause an increase of individual productive ef-fects and contribute to more efficient water use.