Asian rust and soybean productivity under potassium fertilization and fungicide, in the 2007/08 Cropseason
DOI:
https://doi.org/10.5433/1679-0359.2012v33n3p941Keywords:
Phakopsora pachyrhiz, Nutrição mineral, Adubação.Abstract
Potassium has a major impact on plant diseases. Thus, the objective of this research was to evaluate the effect of potassium fertilization with and without fungicide sprays on asian soybean rust incidence and severity, in Dourados – MS, Brazil, in the 2007/08 cropseason. The experiment was lead in Oxisol (Typic Haplustox), cultivated on no-tillage system on corn mulching. The experimental design was a randomized complete block with six replications, and treatments arranged in split-plots (plots – five K2O rates (0; 40; 80; 120 and 160 kg ha-1) using as fertilizer the potassium chloride (KCl) and subplots (presence and absence of fungicide sprays with azoxystrobin+ciproconazole). The incidence and severity of asian soybean rust, yield and 100 grains weight were analyzed. Fungicide application was essential for asian soybean rust control resulting in yield increase as well as weight of 100 grains. Without chemical protection yield was reduced in 22% (574.1 kg ha-1), and the weight of 100 grains decreased 18.6%. The rate of 80 kg ha-1 K2O associated with fungicide application was promising to reduce the deleterious effects of asian soybean rust considering the incidence in the middle portion and the upper third of the plants and severity in the upper third of the soybean plants.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
Semina: Ciências Agrárias adopts the CC-BY-NC license for its publications, the copyright being held by the author, in cases of republication we recommend that authors indicate first publication in this journal.
This license allows you to copy and redistribute the material in any medium or format, remix, transform and develop the material, as long as it is not for commercial purposes. And due credit must be given to the creator.
The opinions expressed by the authors of the articles are their sole responsibility.
The magazine reserves the right to make normative, orthographic and grammatical changes to the originals in order to maintain the cultured standard of the language and the credibility of the vehicle. However, it will respect the writing style of the authors. Changes, corrections or suggestions of a conceptual nature will be sent to the authors when necessary.
