Coffee Science - v.14, n.3, 2019
URI permanente para esta coleçãohttps://sbicafe.ufv.br/handle/123456789/12417
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Item Indaziflam application in newly transplanted arabica coffee seedlings(Editora UFLA, 2019-07) Gomes, Carolina Alves; Pucci, Laís Franchini; Alves, Deivide Patrik; Leandro, Vitor Alves; Pereira, Gustavo Antônio Mendes; Reis, Marcelo Rodrigues dosWeed management is one of the main and most problematic cultural practices used in coffee plantations. Slow growth, broad spacing associated with scarce registered products for weed control at an early crop stage, are the main problems faced by producers. Therefore, it is desirable for new herbicide molecules to be registered for this crop, as is the recent case of indaziflam. This study aimed to know the influence of indaziflam on the morphological characteristics of coffee plants and to propose alternatives to reduce its effects on plants. Therefore, the effects of this herbicide on two arabica coffee cultivars were studied, as well as the association of this herbicide with protection of the seedling collar (PVC pipes and bovine manure). Controls on weeds, possible injury on seedlings and effects on the main morphological characteristics of coffee plants were evaluated. Although treatments with the use of indaziflam cause intoxication in the seedlings, a reduction in plant damage was observed over time, and the damage was insignificant. In general, it was observed that cultivar IBC 12 suffered minor injuries, but it is more sensitive to the presence of indaziflam, since it presented greater damage in the morphological variables. The use of manure with the PVC pipe can be an alternative to reduce the effects of this herbicide, as it reduced the effects of the product on the root system of this cultivar. It is concluded that the application of indaziflam causes mild symptoms in coffee plants independent of the planted cultivar. Indaziflam causes reduction in seedling morphology, and this effect is dependent on the cultivar used. The use of manure associated to the PVC pipe can be an alternative to reduce the effects of indaziflam, mainly in the root system of coffee plants.Item Association of indaziflam and oxyfluorfen in coffee pre-transplantation(Editora UFLA, 2019-07) Pucci, Laís Franchini; Fukada, Paulo Massaharu; Pereira, Gustavo Antônio Mendes; Alves, Deivide Patrik; Gomes, Carolina Alves; Reis, Marcelo Rodrigues dosWeed management in the pre-transplantation of coffee plants is an essential condition for the future success of the crop. Currently, the producer has few options to perform chemical management at this stage. Therefore, one of the solutions that is being used is the tank mixing of products proven efficient with new products on the market, such as indaziflam. The objective of this study is to know the selectivity of indaziflam, associated or not with oxyfluorfen, in coffee pre-planting and its effectiveness in weed control. Thus, the following treatments were tested in the field: indaziflam (25 g ha -1 a.i.), indaziflam (50 g ha -1 a.i.), oxyfluorfen (960 g ha -1 a.i.), indaziflam (25 g ha -1 a.i.) + oxyfluorfen (960 g ha -1 a.i.), indaziflam (50 g ha -1 a.i.) + oxyfluorfen (960 g ha -1 a.i.), plus a weeded and a non-weeded control. All treatments caused low intoxication in the seedlings, but without impairing the development and morphological variables of the plants. The treatments were efficient in controlling the species Bidens pilosa L., Commelina benghalensis L., Urochloa decumbens, Emilia fosbergii and Melampodium perfoliatum until 68 days after application. At 104 days, it was observed that there was a reduction in the efficiency of the products. It is concluded that the associated use of indaziflam and oxyfluorfen does not cause intoxications capable of interfering with the development of coffee plants. The association of these herbicides or their isolated applications is efficient in the control of weeds in the pre-transplantation of coffee plants, and the choice of the best management strategy is dependent on the weed community present in each area.Item Selectivity of fluazifop-p-butyl in young coffee plants(Editora UFLA, 2019-07) Voltolini, Giovani Belutti; Castanheira, Dalyse Toledo; Menicucci Netto, Pedro; Alecrim, Ademilson de Oliveira; Rezende, Tiago Teruel; Guimarães, Rubens José; Gonçalves, Adenilson HenriqueWeed control is fundamental in coffee cultivation due to their big interference, competing with the crop for water, light and nutrients. Among the control methods used, chemical control is highlighted, as a function of its high efficiency and low cost. However, due to application failures, herbicide drift phytotoxicity is common. Aiming at the search for selective active ingredients in coffee plants, the objective in this study was to evaluate the selectivity of the active ingredient Fluazifop- p-butyl on the young coffee plants, and its effects on plant morphology, anatomy and physiology. The experiment was carried out in a greenhouse, with ‘Topázio MG 1190’ coffee plants (Coffea arabica L.), cultivated in pots with a capacity of 11 L substrate. The statistical design was randomized block design (RBD), with four replications and four doses of the herbicide, making up 16 experimental plots. Each plot consisted of three plants. The treatments were: 0%; 50%; 100% and 200% of the recommended commercial dose of the herbicide Fluazifop-p-butyl. The evaluations were performed at 120 days after application of the treatments. Morphological, physiological and anatomical characteristics were evaluated. Regardless of the evaluated characteristic, there was no difference between the doses of the herbicide. There were no visual phytotoxicity symptoms in the young coffee plants that received the herbicide Fluazifop-p-butyl. The growth of the coffee plants and the physiological and anatomical characteristics were not altered due to the application of the herbicide Fluazifop-p-butyl.