ALLELOPATHIC EFFECT OF Sorghum bicolor AND Digitaria insularis ON GERMINATION AND INITIAL DEVELOPMENT OF CANOLA

Thiago Souza Campos,Jaime Santos Do Rego Junior,Ane Gabriele Vaz Sousa,Natália Arruda,Westefann Dos Santos Sousa,Cleiton Gredson Sabin Benett

doi:10.32404/rean.v7i4.4230

Thiago Souza Campos, Jaime Santos Do Rego Junior + Show 4 more

Open Access

https://doi.org/10.32404/rean.v7i4.4230

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Abstract

Agriculture depends on biotic and abiotic factors, and one of them is allelopathy, defined as the chemical interference that one plant has on others, which can negatively affect germination. The objective of this work is to evaluate the allelopathic effects of Sorghum bicolor and Digitaria insularis on seed germination and initial development of canola seedlings (Brassica napus L.). A completely randomized design was used in a 2x5 factorial scheme (two extracts: D. insularis and S. bicolor) and five concentrations (0, 25, 50, 75, and 100%), with four replicates of fifty seeds, the plot being constituted by a 'gerbox' box containing 50 seeds evenly distributed. The variable analyzed were germination percentage (G), abnormal seedlings (AS), dead seeds (DS), length of the shoot (SL) and primary root (RL), total length (TL) of the seedling, shoot ratio (S/T), and root ratio (R/T). The aqueous extracts of D. insularis interfere in all variables studied, which compromises the formation of normal seedlings, regardless of concentration. The extract of S. bicolor expressed allelopathic effects only in concentrations above 75%. Both species can inhibit the initial development of canola plants.

Highlights

Canola (Brassica napus L.) is an agricultural product of great economic value due to its flexibility, being used both in human and animal consumption and biofuels production
It was observed that the D. insularis extract presented a greater interference, which was significant according to statistical analysis, where the variables of abnormal seedlings, shoot length and shoot ratio were more affected by this extract, compromising the seedlings’ starting development
For the evaluated germination parameters, dead seeds, primary root length, total length, and root ratio, it is noted that the D. insularis extract was highly harmful to the seed, interfering mainly on the root system formation, and difficulty in its settlement

Summary

Introduction

Canola (Brassica napus L.) is an agricultural product of great economic value due to its flexibility, being used both in human and animal consumption and biofuels production. Canola is used in Brazil as a winter crop and as an alternative in the crop rotation system, collaborating to reduce phytosanitary problems of crops of great economic weight such as soybeans, beans, corn, and wheat (Cargnelutti et al, 2015). It can be used as a vegetal covering of the soil, being the species most cultivated in the country Brassica napus L. var. It can be used as a vegetal covering of the soil, being the species most cultivated in the country Brassica napus L. var. oliferous, where its late cultivation in winter could contribute to optimizing the use of agricultural resources further, creating another income opportunity for farmers (Milciades et al, 2014)

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