&lt;b&gt;Soil weed seed bank &lt;i&gt;in situ&lt;/i&gt; and &lt;i&gt;ex situ&lt;/i&gt; at a smallholder field in Maranhão State, northeastern Brazil

Mesquita, Mário Luiz Ribeiro; Andrade, Leonaldo Alves de; Pereira, Walter Esfrain

doi:10.4025/actasciagron.v37i1.19360

Cited by 5 publications

(7 citation statements)

References 25 publications

(11 reference statements)

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“…P. H. Raven, Schoenoplectus juncoides (Roxb.) Palla, Lindernia crustacea (L.) F. Muell, Cyperus sphacelatus Roth, Cyperus iria L., Fimbristylis dichotoma (L.) Vahl, Boerhavia erecta L., Rhynchospora nervosa (Vahl) Boeck, Scleria lithosperma (L.) Sw. and Sida rhombifolia L. [16]. In Latin America, species of the family Cyperaceae largely dominates the weed seedbank in the soil of rice fields [16].…”

Section: Latin Americamentioning

confidence: 99%

“…Germination peak is generally observed at 25 days after the beginning of the study which coincides with the period of the start of the rainy season in the region leading to an increase in weed germination and emergence in weed soil seedbank. Germination stabilization generally occurs at 115 days after start of study [16] (Figure 1). …”

Section: Latin Americamentioning

confidence: 99%

“…The highest number of individuals and species found ex situ contribute for the greatest floristic diversity ex situ [16].…”

Section: Latin Americamentioning

confidence: 99%

“…Research on identification and quantification of weed species germinated in the soil seedbank from rice fields were carried out by numerous authors [9,[15][16][17][18][19][20]. However, due to its ecological and economic importance, the status of the weed seedbank in rice cropping fields needs to be further investigated.…”

Section: Introductionmentioning

confidence: 99%

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Weed Seedbank in Rice Fields

Mesquita¹

2017

Advances in International Rice Research

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The weed seedbank in the soil is the major source of weeds in rice fields. Therefore, information on ecological aspects of weeds occurring in rice, including their potential seed production, is crucial for weed management. The size of the weed seedbank in rice fields is highly variable depending on the climate, relief position, soil moisture content, depth of sampling, history of the areas and management practices used by farmers. As a survival strategy, colonization and persistence in the communities, most common weeds in rice fields produce huge number of seeds and vegetative propagules with physical and physiological dormancy mechanisms, insuring seed viability in the soil for long periods. A large proportion of weed seedbank remains generally on or close to the soil surface after seed rain. Sampling protocols involve the use soil cores at variable soil depths. Determination of the size of the weed seedbank can be made by seed direct extraction and germination methods. The latter is more precise with respect to enumeration of viable seeds in the soil. Weed management in rice fields should focus on methods suitable to decrease the weed population in the soil seedbank.

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Section: Latin Americamentioning

confidence: 99%

Section: Latin Americamentioning

confidence: 99%

“…The highest number of individuals and species found ex situ contribute for the greatest floristic diversity ex situ [16].…”

Section: Latin Americamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Weed Seedbank in Rice Fields

Mesquita¹

2017

Advances in International Rice Research

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“…Parmi les adventices présentes dans les rizières figurent Rottboellia cochinchinensis (Rodenburg & Johnson, 2009), Euporbia heterophylla (Rodenburg & Johnson, 2009) et Porophyllum ruderale (Mesquita, Andrade, & Pereira, 2015;Moody, 1989). Ces espèces annuelles sont présentes durant tout le cycle du riz.…”

Section: Introductionunclassified

Caractérisation Physiologique Et Évaluation Du Comportement Germinatif De Semences De Rottboellia Cochinchinensis, Euphorbia Heterophylla, Et Porophyllum Ruderale, Trois Adventices Des Rizières De Côte d’Ivoire

Yao¹,

Ipou²,

Angaman³

et al. 2017

ESJ

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Weeds are the most important biological constraint reducing rice production. This study was conducted to know the physiological characteristics and the germinative behavior of the seeds of Rottboellia cochinchinensis, Euphorbia heterophylla and Porophyllum ruderale, three major weeds of rice field in Côte d'Ivoire. Seed characteristics were determined according to ISTA's standards. These three weeds had orthodox seeds with low moisture content (< 15%). These weeds raise better when they were sown on the surface (0-0.5 cm) or slightly buried in the ground. E. heterophylla and P. ruderale germinated well when their seeding density is high (150 seeds/Petri dish). For R. cochinchinensis, when the seedling density is low (25 seeds/Petri dish). The germination was maximum after five to nine days. RésuméLes mauvaises herbes constituent l'une des contraintes biologiques les plus importantes entrainant une baisse de la production du riz. Cette étude a été menée en vue de connaître les caractéristiques physiologiques et le comportement germinatif des semences de Rottboellia cochinchinensis, de Euphorbia heterophylla et de Porophyllum ruderale, trois adventices majeures des rizières de la Côte d'Ivoire. Les caractéristiques physiologiques ont été déterminés selon les normes de ISTA. Ces trois adventices possèdent des semences orthodoxes qui ont une teneur en eau inférieure à 15 %. Ces graines lèvent mieux lorsqu'elles sont semées en surface (0 cm) ou à une faible profondeur de 0,5 cm. E. heterophylla et P. ruderale germent mieux lorsque leur densité de semis est forte (150 graines/boîte de Pétri). Par contre les semences de R. cochinchinensis germent mieux lorsque la densité de semis est faible (25 graines/boîte de Pétri). Pour ces trois adventices, la germination est maximale au bout de cinq à neuf jours.

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