Investigation of the effect of product Rhizoflo Premium on the occurrence of insect pests in maize (Zea mays L.) and the yield of maize

Na Laboratorijskem polju Biotehniške fakultete v Ljubljani smo konec aprila 2018 posejali dva hibrida koruze – \u27SY Dartona\u27 in \u27NK Timic\u27. Na njivi smo s feromonskimi pastmi spremljali sezonsko dinamiko koruznega hrošča (Diabrotica virgifera virgifera [Le Conte]), hroščev pokalic (Agriotes spp.), koruzne vešče (Ostrinia nubilalis [Hübner]) in bolhačev iz rodu Phyllotreta ter z lepljivimi ploščami sezonsko dinamiko fižolove muhe (Delia platura [Meigen]). Koruza je bila posejana v bločnem poskusu s tremi ponovitvami, pri vsakem hibridu smo imeli dve obravnavanji: kontrolo (netretirano zrnje) in zrnje, ki je bilo pred setvijo poškropljeno s pripravkom Rhizoflo Premium (proizvajalec tega biološkega gnojila je podjetje CKC iz Argentine). Med poskusom smo v 10-dnevnih intervalih spremljali pojavljanje škodljivih žuželk. Koruzni hrošč se je pojavljal od sredine junija do žetve, pokalice od konca aprila do sredine avgusta, koruzna vešča od sredine avgusta do žetve, bolhači od konca aprila do žetve ter fižolova muha od konca aprila do začetka septembra. Med izvajanjem poskusa smo v dveh terminih (28. junija in 30. avgusta) tehtali korenine koruze po obravnavanjih in parcelah. Povprečna masa korenin hibridu \u27NK Timic\u27 je bila v obeh terminih v obravnavanju s tretiranim zrnjem značilno večja (101,9±8,4 g in 320,9±38,8 g) kot v kontroli (72,7±5,7 g in 310,5±35,2 g). Koruzo smo poželi 20. septembra in zrnje iz različnih obravnavanj stehtali. Ugotovili smo, da je bil povprečni pridelek zrnja koruze pri obeh hibridih značilno večji v obravnavanju s tretiranim zrnjem (\u27SY Dartona\u27 4,3 t/ha in \u27NK Timic\u27 6,3 t/ha).At the Laboratory Field of Biotechnical Faculty in Ljubljana, at the end of April 2018, two maize hybrids were sown – \u27SY Dartona\u27 in \u27NK Timic\u27, where we monitored the seasonal dynamics of the occurrence of five insect pests: Western corn rootworm (Diabrotica virgifera virgifera [Le Conte]), catchfly (Agriotes spp.), European corn borer (Ostrinia nubilalis [Hübner]), striped flea beetles from Phyllotreta genus and seedcorn maggot (Delia platura [Meigen]). Maize was sown in a block experimetn with three repetitions. For each hybrid, we had two treatments: control (untreated grains) and grains, which were sprayed with Rhizoflo Premium before sowing (product of this biological fertilizer is developed by CKC Company from Argentina). The occurrence of insect pests was monitored in 10-day intervals during the experiment. The Western corn rootworm appeared from middle of June until harvest, catchfly from the end of April to the middle of August, European corn borer from middle of August until harvest, striped flea beetles from late April until harvest, and seedcorn maggot from late April until early September. During the experiment, we weighed the roots of maize twice (June 28th and August 30th) in individual treatments and parcels. The average root mass in the \u27NK Timic\u27 hybrid was typically greater in treatment with treated grains (101.9±8.4 g and 320.9±38.8 g) than in control (72.7±5.7 g and 310.5±35.2 g) at both weighing periods. Maize was harvested on September 20th and grains from different treatments were weighed. We found that the average yield of corn grains in both hybrids was typically higher in treatments with Rhizoflo Premium (\u27SY Dartona\u27 4.3 t/ha and \u27NK Timic\u27 6.3 t/ha)