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Abstract

Two field experiments were established at the Agricultural Experimental Station of the National Research Centre at Nubaria, Beheira Governorate, Egypt to study the herbicidal potential of the leaf extract of Eucalyptus citriodora at 5, 10, 15, 20 and 25% compared to two hand hoeing, unweeded treatments and the chemical herbicides Bentazon + Clethodium, Bentazon + Fluazifop-P-butyl and Butralin on pea plants and associated weeds. The results indicated that two hand hoeing achieved the maximum weed depression as expressed by the dry matter of total weeds. The dry matter of total weeds decreased by 95.08 to 94.77% as compared with unweeded treatment 50 and 70 days after sowing (DAS) followed by Butraline (93.93–94.65%), Bentazon + Clethodium (93.26–94.07%), Bentazon + Fluazifop--P-butyl (91.82–92.77%) and leaf extract of Eucalyptus at 25% (91.61–91.95%). Furthermore, the reduction in weed development was accompanied by enhanced pea growth and yield. The results revealed that two hand hoeing was the best treatment to increase plant height, shoot dry weight and SPAD value at 50 and 70 DAS. Also, two hand hoeing produced the maximum values of pod length and number of seeds/pod. The results also indicated that Bentazon + Clethodium treatment gave observable values [recorded 72.96% in pod yield (ton ⋅ fed.–1) over that of unweeded control] of number of pod/plant, weight of pod/plant, seed yield/fed and protein percentage. Also, the results revealed great increases in the growth of pea as well as yield due to treatment with E. citriodora dry leaf extract at 25%. [recorded 64.8% in in pod yield (ton ⋅ fed.–1) over that of unweeded control]. So, the results indicated using Bentazon + Clethodium as well as E. citriodora dry leaf extract at 25% to control weeds associated with pea plants. The authors suggested application of E. citriodora dry leaf extract at 25% in controlling weeds associated with pea plants as a safe method that avoids environmental contamination.

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Authors and Affiliations

Ibrahim Mohamed El-Metwally
Kowthar Gad El-Rokiek
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Abstract

This study aimed to evaluate the bioherbicidal effect of aqueous fresh extracts of leaves and roots of the Aloe vera plant on the broad leaf weed growth of Sonchus oleraceus associated faba bean plants. During the winters of 2020/2021 and 2021/2022, two pot experiments were carried out in the greenhouse of the National Research Center. Leaf and root aqueous extracts of Aloe vera were applied as soil and/or spray treatments at different concentrations. The results showed that there was significant inhibition in the fresh and dry biomass of S. oleraceus and was maximum with application of soil treatment (10%) of the leaf extract sequenced by spraying leaf extract at 20%. Furthermore, the inhibition of the weed growth was accompanied by an increase in the growth and yield of faba bean. The results indicated that phenols, flavonoids, alkaloids, tannins and saponins were present in the leaf extract, and there were smaller amounts of tannins and saponins in the root extract than in the leaf extract. Total phenols, flavonoids, alkaloids in the leaf extract was more than three times that of the root extract. The results also revealed that the presence of higher concentrations of natural substances in the leaf extract than in the root extracts gave it its efficiency in inhibiting the growth of S. oleraceus weeds.
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Authors and Affiliations

Kowthar Gad El-Rokiek
1
Abeer Nasr Shehata
2
Samia Ameen Saad El-Din
1
Shahira Ali Tarraf
1

  1. Botany Department, National Research Centre, Giza, Egypt
  2. Department of Biochemistry, National Research Centre, Giza, Egypt

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