Weed interference in the initial growth of meristem-grown sugarcane plantlets

Abstract

The use of new systems of sugarcane planting such as PleneTM, Plene EvolveTM, Plene PBTM and AgMusaTM requires specific studies on the initial interference of weed in the sugarcane crop. The objective of this study was to evaluate initial weed interference in meristem-grown sugarcane plantlets (Plene EvolveTM). The weed species used were Brachiaria decumbens and Panicum maximum, at four different densities (1, 2, 3 and 4 weed plants pot-1), plus a control treatment free from weed interference. The statistical design was completely randomized with four replicates per treatment, with an individual study for each weed species. The evaluations performed were: plant height at 45, 60 and 90 days after emergence (DAE), number of sugarcane tillers at 30, 60 and 90 DAE and dry matter of both sugarcane and weed plants at 90 DAE. B. decumbens and P. maximum caused reductions in the initial growth and development of sugarcane. P. maximum was more aggressive to meristem-grown sugarcane plants, during their early development, than B. decumbens.

Assessment of Texture Features for Bermudagrass (Cynodon dactylon) Detection in Sugarcane Plantations

“…The yield losses caused by Bermudagrass are hardly assessed with precision, since they are heavily dependent on sugarcane variety, ground straw management, and the chemical control used [10,11]. Considering that losses caused by Bermudagrass on sugarcane plantations are estimated between 6% and 14% of yield production [4], the losses from this application ranged from 28.2 to 65.8 tons of sugarcane, or an average loss of up to 12.1 tons*ha −1 .…”

“…Some are dicotyledonous (usually called broadleaf weeds), but most are monocotyledonous and belong to the Poaceae family (commonly known as grasses) [4]. Weeds such as Cynodon dactylon (bermudagrass), Sorghum halepense (johnsongrass), Eleusine indica (goosegrass), Panicum maximum (guineagrass), and Brachiaria reptans (creeping panic grass) are highlighted as the most common species affecting sugarcane crops around the world [4,[9][10][11]. In an experimental analysis of sugarcane crops without weed control, weeds affected up to 60% of the planted area, representing yield losses up to 45 tons × ha −1 [4].…”

Leaching potential of S-metolachlor in a medium-textured Oxisol soil with bioindicator plants

“…Weeds are one of the main biotic factors present in the sugarcane production system, interfering with the development and yield of crops (Paula et al, 2018). The primary method of controlling these species in sugarcane is chemical because the herbicides used have a high control efficiency (Concenço et al, 2016).…”