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Effect of TMS(nanostructured silicon dioxide) on growth of Changbai larch seedlings

Journal of Forestry Research 2004年第2期15卷 138-140,i003页

作者：林宝山刁绍起李春辉方利军乔树春于民北华大学林学院丰满区林业局吉林市132013 吉林省桦甸县红石林业局 130000

The roots of 200 one-year-old Changbai Larch (Larix olgensis) seedlings were soaked for 6 hours at the TMS concentrations of 2000, 1000, 500, 250, 125, and 62 μL·L?1. Mean seedling height, root collar diameter, main root length and number of lateral roots were measured every 15 days during growing season from May 30 to Oct. 20. Experimental results showed that TMS treatments greatly promoted seedling growth and improved seedling quality. The treatment by 500 μL·L?1 TMS produced the best result, for which the mean height, root collar diameter, main root length, and the number of lateral roots of seedlings were increased by 42.5%, 30.7%, 14.0%, and 31.6%, respectively, compared to that of the control seedlings. As to seedling quality, grade-I seedling and grade-II seedlings were fifty-fifty, and no grade-III seedlings was found. The treatment by 500 μL·L?1 TMS resulted in the highest chlorophyll concentration. Keywords Changbai Larch - Larix olgensis - seedling production - Nanostructured silicon dioxide CLC number S143.8 Document code B Foundation item: This study is supported by Jilin Forestry Group Co.Biography: LIN Baoshan (1955-), male, Associate professor at the college of forestry, Beihua University, Jilin City 132011, Jilin Province, P.R China.Responsible editor: Chai Ruihai.

关键词： Changbai Larch Larix olgensis seedling production Nanostructured silicon dioxide

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Constraints, and Implications of Organic Farming in Bananas and Plantains production Sustainability in Benin

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Agricultural Sciences 2021年第6期12卷 645-665页

作者： Anicet G. Dassou Silvère Tovignan Fifanou Vodouhè Gbèlidji T. Vodouhè René Tokannou Gervais-Claude Assogba Valentin Kindomihou Léonard Afouda Aimé H. Bokonon-Ganta Simplice D. Vodouhè Laboratory of Biotechnology Genetic Resources and Plant and Animal Breeding National University of Sciences Technologies Engineering and Mathematics (UNSTIM) Dassa Benin Laboratory of Economic and Social Dynamics Analysis Faculty of Agronomy University of Parakou (UP) Parakou Benin West African Network for Ecological and Organic Agriculture (PABE) Cotonou Benin School of Economy Socio-Anthropology and Communication (EESAC) FSA UAC Abomey-Calavi Benin Laboratory of Applied Ecology (LEA) Faculty of Agronomic Sciences (FSA) University of Abomey-Calavi (UAC) Cotonou Benin Laboratory of Agricultural Entomology (LEAg) Faculty of Agronomic Sciences (FSA) University of Abomey-Calavi (UAC) Cotonou Benin

Bananas and plantains production is an important income source for millions of small farmers. The increased demand for bananas and plantains on national and international market would justify its value chain development. However, its value chain faces several constraints, of which production and marketing turn out to be the most important. This study aimed at determining and analyzing the constraints related to Bananas and Plantains value chain and showing the gaps between agroecological and agricultural practices used by farmers in southern Benin. Characterization was carried out on the seed production systems, agricultural practices, bananas and plantains production, fruit availability and commercialization constraints with farmers using individual and focus groups surveys. Bananas and plantains seedlings production and acquisition varied according to production areas. Their seedlings self-production was widespread in production areas and 26 cultivars have been identified as major. The availability of these cultivars varied across time and production areas. There were significant negative effects of agricultural practices on major banana pest’s presence. Bananas and plantains production was limited by 12 factors, from which banana plants fall related to the wind, lack of financial support to irrigate banana fields, climate changes, no availability of cultivable lands and low rainfall are revealed to be the most important. Regarding commercialization constraints, low sale prices and difficult access to markets were the most important. Better knowledge of bananas and plantains production systems would help to develop sustainable organic farming strategies to reduce the constraints identified.

关键词： Bananas and Plantain seedling production Agricultural Practices Constraints Organic Farming

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