Aerial fungicide application on irrigated lowland rice with varying spraying nozzles/Aplicacao aerea de fungicidas na cultura do arroz irrigado com diferentes bicos de pulverizacao

• Published in: Ciência rural 2012-12, Vol.42 (12), p.2185
• Main Authors: Bayer, Tania, Arrue, Adriano, Costa, Ivan Francisco Dressler da, Lenz, Giuvan, Coradini, Cezar, Sari, Bruno Giacomini, Pes, Maiquel Pizzuti
• Format: Article
• Language: Spanish
• Subjects: Chromatography; Technology application
• ISSN: 0103-8478

In the harvest year of 2007/2008 a study was carried to evaluate the droplets deposition and penetration throughout water sensible cards and gas chromatographic analysis. Were used the hydraulic nozzle, electrostatic nozzle and rotary-disk atomizer spraying systems, with different volumes of spray solution. Aerial applications were performed at R3 stage using the aircraft Ipanema EMB'202 and the fungicide trifloxystrobin + propiconazole. Throughout the lection of the water sensible cards was determinate the droplet density, the medium numeric diameter, the medium volumetric diameter, the relative amplitude and the percentage of droplet penetration in the canopy. Chromatographic analysis was also performed to determinate the fungicide penetration into the biological target. The pulverization systems hydraulic nozzle 20L [ha.sup.-1] and 30L [ha.sup.-1] and the electrostatic system 10L [ha.sup.-1] demonstrated higher droplet density in the upper third. The rotary'disk atomizer 15L ha' showed higher droplet density in the mid and low third. To the medium volumetric diameter, the electrostatic nozzles and the rotary'disk atomizer showed the lowest values. The higher homogeneity in the upper third was attained with rotary'disk atomizer at the pulverization rates of 6L [ha.sup.-1] and 10L [ha.sup.-1]. The chromatographic analysis showed that the higher quantity of product retention was obtained with the electrostatic system at the pulverization rate of 10L [ha.sup.-1] in the lower plant extract. Key words: hydraulic nozzle, electrostatic nozzle and rotary-disk atomizer Na safra agricola 2007/2008, foi realizado um estudo com o objetivo de avaliar a deposicao e penetracao de gotas atraves de cartoes hidrossensiveis e analise cromatografica. Para isso, utilizaram-se o bico eletrostatico, bico hidraulico e atomizadores rotativos de discos com diferentes volumes de calda. As pulverizacoes foram realizadas no estadio R3 da cultura, com aeronave Ipanema EMB-202, aplicando-se fungicida trifloxistrobina + propiconazole. Atraves da leitura de cartoes hidrossensiveis, determinou-se a densidade de gotas, o diametro medio numerico, diametro medio volumetrico, amplitude relativa e a penetracao de gotas no dossel (%). Tambem foi utilizada a analise cromatografica para determinar a penetracao do produto no alvo biologico. O bico hidraulico, com taxa de aplicacao de 20L [ha.sup.-1] e 30L [ha.sup.-1], e o bico eletrostatico, com taxa de aplicacao de 10L [ha.sup.-1], obtiveram mai