The response of the three romaine lettuce cultivars to nitrogen fertigation by drip system was investigated in the field experiment carried out in 2009-2010 on the very light soil at Kruszyn Krajeński near Bydgoszcz. The trial was established as one-factorial trial with four replications. The studied factor was cultivar: ‘Barracuda', ‘Chiquina' i ‘Romora'. Fertigation was conducted with the use of proportional mixing dispenser. The use of drip irrigation connected with nitrogen fertigation enabled the proper growth and development as well as valuable yielding of plants on the very light soil, in the region of low rainfall amounts during the vegetation period. From among the three cultivars tested, ‘Barracuda' was cha-racterized by the highest: yield, head weight and dry matter content. The influence of drip irrigation
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Field experiments were conducted in 2011 on the very light soil in Kruszyn Krajeński near Bydgoszcz. Responses of the three romaine lettuce cultivars grown in spring and autumn to nitrogen fertigation by drip system were compared. Experiments were established as two-factorial trials, four times replicated. The experimental factors were: nitrogen dose of fertigation (25 kg N•ha-1, 50 kg N•ha-1), cultivars (‘Barracuda', ‘Chiquina', ‘Romora'). Fertigation was conducted with the usage of proportional mixing dispenser. Higher marketable yield of romaine lettuce cultivars was noted in spring cultivation. Increased nitrogen dose (from 25 kg N•ha-1 to 50 kg N•ha-1) significantly increased marketable yield of lettuce. From among the tested cultivars, ‘Romora' was characterized by the higher yield in spring cultivation whereas ‘Barracuda' - in autumn. ‘Chiquina' was characterized by the lowest yield. The higher weight of a single lettuce head was noted in spring cultivation. The higher nitrogen dose significantly increased the single lettuce head. The highest single lettuce head was noted in case of ‘Barracuda'. On average for cultivars tested, the higher nitrogen dose caused the decrease of dry matter content in leaves of lettuce grown in spring time, and in case of autumn cultivation this tendency was opposite - the higher ...
