Prohexadione-calcium isolado ou em associação com herbicidas e outros produtos no manejo em pré-colheita do algodão

Abstract

-To maintain the quality of the cotton fiber, as well as to provide great yields on the harvest, some aspects must be taken into account such as the uniformity of the bolls and the defoliation; therefore, the use of herbicides and maturators become indispensable. Thus, the objective of this paper was to evaluate the efficiency of the prohexadione-calcium regarding its isolate application and in association with other products in the uniformity and opening of the cotton bolls, as well as the defoliation effect and regrowth of the crop. For such, a field experiment was carried out in the municipality of Diamantino -MT. The outline adopted was of randomized blocks with four repetitions and thirteen treatments, those being composed of control without application; prohexadione-calcium + ethephon + cyclanilide; prohexadione-calcium + flumicloracpentyl; prohexadione-calcium + diuron + thidiazuron; prohexadione-calcium + pyraflufen-ethyl; prohexadione-calcium; prohexadione-calcium + iharol. The treatments were applied when approximately 85% of the bolls of the crop 975 WS were open. The variables: apple opening, regrowth and defoliation were analyzed at 0, 3, 6, 10 and 15 days after the application (DAA) and, finally, the productivity of seed cotton was determined. Regardless of the dose, the plants that received prohexadione-calcium associated with ethephon + cyclanilide, diuron + thidiazuron and pyraflufen-ethyl presented a greater number of open bolls and greater defoliation. We can conclude that the different chemical treatments did not provide statistical differences regarding the regrowth of cotton before the harvest, at 15 DAA, and that the use of prohexadione-calcium, isolated or in association with other products, regardless of the dose, did not influence in the productivity of the seed cotton. Keywords: defoliation; Gossypium hirsutum L.; maturing; uniformity of the bolls Resumo -Para manter a qualidade da fibra do algodão, bem como proporcionar ótimos rendimentos na colheita, alguns aspectos devem ser levados em consideração como, por exemplo, a uniformidade dos capulhos e a desfolha, desta forma, a utilização de herbicidas e maturadores tornam-se imprescindíveis. Assim, o objetivo deste trabalho foi avaliar a eficiência do prohexadione-calcium quando aplicado isoladamente e em associação com outros produtos, na Rev. Bras. Herb., v.14, n.1, p.21-29, jan./mar. 2015 uniformização e abertura dos capulhos do algodão, assim como o efeito na desfolha e rebrota da cultura. Para tanto, conduziu-se um experimento de campo no município de Diamantino-MT. Adotou-se o delineamento de blocos casualizados, com quatro repetições e treze tratamentos, sendo estes compostos por: testemunha sem aplicação; prohexadione-calcium + ethefon + cyclanilide; prohexadione-calcium + flumiclorac-pentyl; prohexadione-calcium + diuron + thidiazuron; prohexadione-calcium + pyraflufen-ethyl; prohexadione-calcium; prohexadione-calcium + iharol. Os tratamentos foram aplicados quando aproximadamente 85% das maçãs da cultivar 975 WS esta...

Understanding the Environmental Behavior of Herbicides: A Systematic Review of Practical Insights

“…Overall, lower temperatures, lower precipitation, and shorter crop cycles, especially in the case of soybeans with early-maturing cultivars to advance second-crop planting, are factors that increase the possibility of carryover. In the recent study by Inoue et al [73], the carryover of various herbicides in the soil is addressed, considering various agricultural crops grown in rotation and succession. The main crops sensitive to herbicides include sunflower, soybean, common bean, coffee, sorghum, corn, millet, cotton, canola, among others.…”