Deposição de calda em folhas de cafeeiro e perdas para o solo com diferentes taxas de aplicação e pontas de pulverização

O cafeeiro apresenta diversos desafios para a tecnologia de aplicação dos produtos fitossanitários, principalmente no que se refere à penetração da calda no dossel da cultura e à redução da deriva. Objetivou-se analisar a deposição de calda pulverizada na folhagem do cafeeiro e a perda para o solo, proporcionada pela aplicação com diferentes taxas e pontas de pulverização. O experimento foi conduzido no esquema fatorial 2 x 2 e oito repetições, sendo os fatores pontas de pulverização (jato cônico vazio - ATR e jato cônico vazio com indução de ar - TVI) e taxas de aplicação de calda (200 e 500 L ha-1). Em todos os tratamentos as aplicações foram realizadas utilizando-se um pulverizador hidropneaumático e o marcador Azul Brilhante, o qual foi quantificado por espectrofotometria. Para avaliação de depósito foram coletadas folhas das metades superior e inferior das plantas e também lâminas de vidro já posicionadas junto à superfície do solo. O uso de pontas com indução de ar mostrou-se viável quanto à deposição de calda no cafeeiro, principalmente junto ao uso da maior taxa de aplicação. O emprego da menor taxa (200 L ha-1) mostrou-se viável junto ao uso da ponta de jato cônico vazio. A ponta com indução de ar proporcionou maiores perdas para o solo

Water Consumption of Greenhouse Lychee Trees under Partial Rootzone Drying

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 9 (2007): Water Consumption of Greenhouse Lychee Trees under Partial Rootzone Drying. Manuscript LW 07 019. Vol. IX. July, 2007

Wear characteristics of selected flat fan nozzles

Artykuł przedstawia problematykę wpływu różnej jakości rozpylenia cieczy opryskowej na jakość pokrycia i potencjał znoszenia (strat cieczy), wywoływane m.in. procesem zużywania się rozpylaczy w czasie ich użytkowania. Przetestowano wybrane polskie rozpylacze szczelinowe, określając ich parametry przed, w trakcie i po badaniach. Podniesiono potrzebę opracowania szczegółowych informacji o jakości pracy rozpylaczy, niezbędnych operatorom opryskiwaczy rolniczych. Stwierdzono, że badane polskie rozpylacze charakteryzują się jakością podobną do renomowanych firm zagranicznych.This article presents the matter of the influence of different quality spraying on the quality of coverage and drift potential (losses of spray liquid) caused by process of wear of the nozzle during their use. Polish selected flat fan nozzles have been tested, specifying their parameters before, during and after the testing. It has been enhanced a need to formulate detailed information about quality of work of the agricultural nozzles which is necessary for the agricultural sprayers operators. It was stated that the investigated Polish nozzles are characterized by a quality similar to leading foreign companies

Evaluation of working quality of Polish air-induction nozzles made by MMAT - preliminary results

Przedstawiono wyniki wstępnej oceny jakości pracy pierwszych rozpylaczy elektorowych polskiej produkcji. Pozwolą one określić przydatność nowych rozpylaczy w ochronie roślin i wskazać zakres ich udoskonalenia technologicznego.Presents the results of preliminary assessment of the working quality of the first Polish air-induction nozzles. They will help determine the suitability of the new nozzles in crop protection and indicate the extent of their technological improvements

Problems with using of automatic weather stations for decision support in crop cultivation

Przedstawiono przegląd parametrów technicznych 30 wybranych automatycznych stacji pogodowych, przydatnych do monitorowania warunków meteorologicznych w uprawach polowych. Scharakteryzowano dokładności czujników, podkreślono problematykę wpływu ich umiejscowienia i dokładności pomiaru na trafność podejmowanych decyzji w uprawie roślin. Wskazano na potrzebę fachowego doboru typu, wyposażenia i sposobu montażu stacji meteorologicznych do różnych zastosowań rolniczych oraz ich certyfikacji. Zestawione informacje będą pomocne do optymalizacji procesów decyzyjnych w rolnictwie precyzyjnym.An overview of the technical parameters of 30 selected automatic weather stations, which are useful for monitoring of the weather conditions in the field crops has been presented in this article. The accuracy of the sensors has been characterized, and the problematic aspects of sensors location influence and the measurement accuracy on the pertinence of decisions made in the cultivation of plants has been emphasized. The need of the professional selection of type, equipment installation and the way of montage of weather stations for various agricultural applications and their certification have been pointed out. The compiled information will be helpful to optimization of the decision processes in precise farmin