排序方式: 共有2条查询结果,搜索用时 15 毫秒
1
1.
Oppong Allen Dadzie Abu M. Ifie Beatrice Asante Maxwell D. Prempeh Ruth N. A. Abrokwah Linda A. Kubi Zipporah Appiah Marfo Esther A. 《Journal of Crop Science and Biotechnology》2023,26(2):167-178
Journal of Crop Science and Biotechnology - Maize (Zea mays L.) is the most important cereal crop in sub-Saharan Africa. However, its production is constrained by many factors including low yields... 相似文献
2.
This paper considers the process of Participatory Varietal Selection (PVS) and presents approaches and ideas based on PVS
activities conducted on upland rice throughout Ghana between 1997 and 2003. In particular the role of informal seed systems
in PVS is investigated and implications for PVS design are identified. PVS programmes were conducted in two main agroecological
zones, Forest and Savannah, with 1,578 and 1,143 mm of annual rainfall, respectively, and between 40 and 100 varieties tested
at each site. In the Savannah zone IR12979-24-1 was officially released and in the Forest zone IDSA 85 was widely accepted
by farmers. Two surveys were conducted in an area of the Forest zone to study mechanisms of spread. Here small amounts (1–2 kg)
of seed of selected varieties had been given to 94 farmers. In 2002, 37% of 2,289 farmers in communities surveyed had already
grown a PVS variety and had obtained seed via informal mechanisms from other farmers, i.e. through gift, exchange or purchase. A modified approach for PVS is presented
which enables important issues identified in the paper to be accommodated. These issues include: utilising existing seed spread
mechanisms; facilitating formal release of acceptable varieties; assessing post-harvest traits, and; the need for PVS to be
an ongoing and sustainable process. 相似文献
1