The aim of this study was the effect of the subsurface drip irrigation with nitrogen fertilization chosen asparagus cultivars on the occurrence of asparagus beetles.The field experiment was carried out in two consecutive years (2009-2010) at Kruszyn Krajeński near Bydgoszcz. The experiment was conducted in a rando-mized block design of a two-factorial system with four replications. The first tested factor was irrigation in two following variants: non-irrigated plots (control) with hand sowing nitrogen fertilizer and subsurface drip irrigated plots with nitrogen fertigation. The second factor was associated with asparagus cultivars: 5 from USA: Apollo, Atlas, UC-157, Grande and Purple Passion, and 3 from Germany: Ramada, Rapsody and Ravel. The number of adults and larvae of both asparagus beetles was observed on every single plot area; three times during the vegetation period from July to August (beginning from the first decade of July and continuing every third week). The harvest plot area was 14,7 m2 (20 plants x 0,35m x 2,1m).The adults and larvae of twelve-spotted asparagus beetles were more nu-merous than common asparagus beetles on tested asparagus cultivars. The adults of twelve-spotted asparagus beetles prefered subsurface drip irrigation asparagus plants: Atlas, UC-157, Grande and Rapsody, than non-irrigated plants of these ...
The field experiments were carried out in two consecutive years (2005-2006) at Kruszyn Krajeński near Bydgoszcz. The aim of the study was the influence of different systems of irrigation in asparagus hybrids cultivation on the very light soil on the occurrence of asparagus beetles. The experiments were conducted in a randomized block design of a two-factorial system with four replications. The first tested factor was irrigation in three following variants: O - non-irrigated plots (control), K - drip-irrigated plots and M - micro-irrigated plots. The second factor was associated with two asparagus hybrids (called by producer): Ap, Gr and one cultivar ‘Schwetzinger Meisterschuss'. The number of adults and larvae of both asparagus beetles was observed on every single plot area; three times during the vegetation period from July to August (beginning from the first decade of July and continuing every third week). The harvest plot area was 14.5 m2 (23 plants x 35 cm x 180 cm). Generally, the adults and larvae of twelve-spotted asparagus beetles were more numerous than common asparagus beetles on aspa-ragus hybrids plants: Ap, Gr and ‘Schwetzinger Meisterschuss'. Microirrigation applied on asparagus hybrids wasn't related with these two asparagus beetles did not susceptible to. Much the ...
