Performances agronomiques de quatre variétés de riz pluvial NERICA de plateau semées à différentes dates en zone soudano-sahélienne au Sénégal

Abstract

Kouakou et al. J. Appl. Biosci. 2016 Performances agronomiques de quatre variétés de riz pluvial NERICA de plateau semées à différentes dates en zone soudano-sahélienne au Sénégal 9382 Performances agronomiques de quatre variétés de riz pluvial NERICA de plateau semées à différentes dates en zone soudano-sahélienne au Sénégal Kouakou et al. J. Appl. Biosci. 2016 Performances agronomiques de quatre variétés de riz pluvial NERICA de plateau semées à différentes dates en zone soudano-sahélienne au Sénégal 9383ABSTRACT Objective: Senegal imports every year 80 % of its rice for consumption. Since the last two decades, current policies are trying to reduce the dependence of the country towards the international market by increasing the national rice production. One of the alternatives for the increase of national rice production is the development of rainfed rice in soudano-sahelian areas of the country. Therefore, the present study aimed to measure the agronomic traits of four upland rainfed rice NERICA (NERICA 1 and NERICA 4 (95-100 days); NERICA 8 and NERICA 11 (75-85 days)) in a soudano-sahelian zone. Methodology and results: Two trials were carried out in 2013 and 2014 at Sinthiou Malème (13°50'N; 13°55'W; 22 m) during the raining season and no water was given through irrigation. Each year, the first trial was sown during the month of July and the second one, during the second one in the month of August. The results showed that the raining season lasted 110 days and dry spells occurred during the flowering stage of the rice varieties. Those drought periods affected negatively the panicle formation and the spikelet pollination. This phenomenon was severe on the latest trials (grain yields decreased of 75-79 %) and on the longest cycle length, varieties (grain yields decreased of 42 %). Conclusion and application:The four rice varieties (NERICA 1, NERICA 4, NERICA 8 and NERICA 11) can be cultivated in the soudano-sahelian zone of Sinthiou Malème but it is advantageous to choose NERICA 8 and NERICA 11 for their shortest cycle length and they must been sown before the fifth decade of July.

Décomposition et effet de la litière de <i>Parkia biglobosa</i> (Jacq.) R. Br. Ex G. Don. sur la croissance et le rendement du riz en Basse Casamance, Sénégal

“…Cette variété a une phase végétative d'une durée moyenne de 20 à 35 jours, atteignant la mi-épiaison entre 55 et 60 jours après semis (Somado et al, 2008). Avec un rendement potentiel d'environ 5 000 kg.ha -1 , elle demeure une variété largement cultivée en milieu paysan grâce à sa productivité, sa rusticité et sa précocité (Kouakou et al, 2016).…”

Comparison of the performances of six (6) introduced varieties of rainfed rice (<i>Oryza</i> sp) in two agroecological zones in south-west of Republic of Congo

“…Agricultural development plans are proposed to reduce food insecurity and fight poverty in these countries (Seck et al, 2013). The recently acquired performance using NERICA rice (New Rice for Africa) in Africa with very good tillering skills, reasonable size and high yields (Mande et al, 2005;Kambou, 2008;Nadie, 2008;Kouakou et al, 2016;), reflect the efforts made.…”