SORGHUM HYBRID CVSW 81198 AND ITS WEED COMMUNITY IN PERIODS WITH AND WITHOUT WEEDING

Paulo Roberto Fidelis Giancotti,Mariluce Pascoína Nepomuceno ,Fernanda Nunes Bressanin,Anne Elise Cesarin,Pedro Luís Da Costa Aguiar Alves ,Matheus Sartori Moro

doi:10.28998/rca.v18i2.9350

Paulo Roberto Fidelis Giancotti, Mariluce Pascoína Nepomuceno + Show 4 more

Open Access

https://doi.org/10.28998/rca.v18i2.9350

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Abstract

The aim of this study was to evaluate the weed populations of sweet sorghum hybrid CVSW 81198 and its interference capacity in increasing periods with and without weeding. Two experiments were carried out, one during the summer and another during the autumn in the municipality of Jaboticabal, São Paulo state, Brazil. For each experiment, two treatment groups were established: one consisting of increasing periods without weeding and another of increasing periods with weeding. Periods were 0, 4, 7, 14, 21, 28, 35, 42 and 56 days after emergence (DAE) in the summer experiment and 0, 4, 7, 14, 21, 28, 35, 42, 49, 56, 63 and 100 DAE in the autumn experiment. Phytosociological studies of the weed community were carried out in each treatment, with emphasis on the importance index of each weed population. Under the experimental conditions, Amaranthus spp. and Alternanthera tenella were the most important species in the weed community of sweet sorghum grown during summer and autumn, respectively. With the natural infestation of the weed community, sorghum hybrid CVSW 81198 did not suffer interference in crop development and stem productivity even without weeding throughout the crop cycle.

Highlights

Since the oil crisis in the decade of 1970s, the use of various raw materials for bioethanol production, such as sugarcane and alternative crops such as sorghum, has been studied in Brazil (Pereira Filho et al, 2013)
Weeds are a major problem for sorghum cultivation, as they can significantly reduce the production of grains, forage or ethanol, when they coexist in the early stages of the crop (Santos et al, 2012; Silva et al, 2014)
The present study aimed to evaluate weed populations infesting sweet sorghum hybrid CVSW 81198 and their interference in increasing periods with and without weeding

Summary

Introduction

Since the oil crisis in the decade of 1970s, the use of various raw materials for bioethanol production, such as sugarcane and alternative crops such as sorghum, has been studied in Brazil (Pereira Filho et al, 2013). Weeds are a major problem for sorghum cultivation, as they can significantly reduce the production of grains, forage or ethanol, when they coexist in the early stages of the crop (Santos et al, 2012; Silva et al, 2014). Reductions of 90, 88 and 50% in the yield of grain, forage and sweet sorghum, respectively, have been reported (Rodrigues et al, 2010; Andres et al, 2009; Silva et al, 2014). Silva et al (2014) consider the integrated weed management as one of the main bottlenecks in the production system, since control carried out at inappropriate time can increase production costs or lead to qualitative and quantitative yield losses. Compared to other economically important annual crops, there are few options for selective herbicides for sorghum crop, in addition to the atrazine molecule (Brazil, 2019)

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