2 research outputs found
The influence of abiotic factors on the presence of European corn borer (Ostrinia nubilalis HĆ¼bner)
Istraživanja su provedena tijekom trogodiÅ”njeg razdoblja (2012. ā 2014.) u poljskim uvjetima s prirodnom zarazom kukuruznoga moljca, na Poljoprivrednom institutu u Osijeku. Cilj istraživanja bio je utvrditi utjecaj razliÄitih varijanti navodnjavanja i gnojidbe i utjecaj genotipa na pojavu i oÅ”teÄenost biljki od kukuruznoga moljca te povezanost ishrane gusjenica s koncentracijom duÅ”ika, silicija i C/N odnosa u listu kukuruza. Na kraju svake vegetacijske sezone zabilježena je masa klipa (g), dužina oÅ”teÄenja stabljike (cm), oÅ”teÄenje drÅ”ke klipa (cm), broj gusjenica u stabljici kukuruza, broj gusjenica u drÅ”ci klipa, te ukupan broj gusjenica po biljci. U 2014. godini kada su bile niže temperature, a veÄa koliÄina oborina utvrÄen je znaÄajno niži napad u odnosu na druge dvije ispitivane godine. Uz pomoÄ feromonskih mamaca utvrÄena je dominantnost Z-tipa kukuruznoga moljca na podruÄju istoÄne Slavonije. PoviÅ”enom razinom sadržaja vode u tlu utvrdilo se manje oÅ”teÄenje biljke, a poveÄanjem razine gnojidbe utvrÄeno je veÄe oÅ”teÄenje na biljkama kao posljedica ishrane gusjenica. UtvrÄena je razliÄita otpornost hibrida u odnosu na oÅ”teÄenje od gusjenica te se hibrid C4 izdvojio kao najotporniji, dok je C1 bio najosjetljiviji. Koncentracija duÅ”ika i silicija u listu kukuruza u negativnoj su korelaciji kao i koncentracija duÅ”ika i C/N odnos. Otpornost kod hibrida nije iskljuÄivo ovisila o koncentracijama duÅ”ika i silicija iako se pokazalo kod veÄine hibrida pri poveÄanoj koncentraciji duÅ”ika veÄe oÅ”teÄenje, a kod poveÄane koncentracije silicija utvrÄeno je manje oÅ”teÄenje.Field experiments with natural population of ECB were conducted in three vegetation seasons (2012-2014) at the Agricultural Institute in Osijek. The aim of this study was to determine the effect of different levels of irrigation and nitrogen fertilization and various genotypes on the occurrence and damage of maize plants from European corn borer larvae and relationship with nitrogen and silicon content as well as C/N ratio. At the end of each growing season were determined ear weight (g), tunnel length (stalk) (cm), ear shank damage (cm), the number of larvae in corn stalk, number of larvae in the ear shank, and total number of larvae in plant. In 2014, with lower temperatures and higher amount of precipitate compared to the previous years, a significantly lower ECB attack was determined. Dominance of Z-type European corn borer on pheromone traps in the area of eastern Slavonia was determined. Increasing the level of soil water content damage from larvae was reduced and increasing the level of nitrogen fertilization feeding activity was increased. We have confirmed different hybrid resistance in regards to damage from larvae, so C4 genotype was the most resistant while C1 was the most susceptible. Concentration of nitrogen and silicon in a maize leaf were in negative correlation as well as nitrogen concentration and C/N ratio. Hybrid resistance didn't entirely depend on nitrogen and silicon concentrations, even though there was greater damage at most hybrids with higher concentration of nitrogen, while damage was reduced with higher concentration of silicon
An analysis of the process and results of manual geocode correction
Geocoding is the science and process of assigning geographical coordinates (i.e. latitude, longitude) to a postal address. The quality of the geocode can vary dramatically depending on several variables, including incorrect input address data, missing address components, and spelling mistakes. A dataset with a considerable number of geocoding inaccuracies can potentially result in an imprecise analysis and invalid conclusions. There has been little quantitative analysis of the amount of effort (i.e. time) to perform geocoding correction, and how such correction could improve geocode quality type. This study used a low-cost and easy to implement method to improve geocode quality type of an input database (i.e. addresses to be matched) through the processes of manual geocode intervention, and it assessed the amount of effort to manually correct inaccurate geocodes, reported the resulting match rate improvement between the original and the corrected geocodes, and documented the corresponding spatial shift by geocode quality type resulting from the corrections. Findings demonstrated that manual intervention of geocoding resulted in a 90% improvement of geocode quality type, took 42 hours to process, and the spatial shift ranged from 0.02 to 151,368 m. This study provides evidence to inform research teams considering the application of manual geocoding intervention that it is a low-cost and relatively easy process to execute