Farmer Participatory Crop Improvement. III. Participatory Plant Breeding, a Case Study for Rice in Nepal

1996 ◽  
Vol 32 (4) ◽  
pp. 479-496
Author(s):  
B. R. Sthapit ◽  
K. D. Joshi ◽  
J. R. Witcombe
Keyword(s):  
Plant Breeding ◽  
High Altitude ◽  
Crop Improvement ◽  
Participatory Plant Breeding ◽  
Great Success ◽  
Farmer Participation ◽  
Use Of Resources ◽  
Participatory Crop Improvement ◽  
Better Than

SUMMARYA participatory plant breeding (PPB) programme was conducted for the high altitude areas of Nepal. The aim was to breed acceptable varieties with minimum use of resources and to utilize farmers' knowledge in the PPB programme. Farmer participation began at the F5 stage and progress was followed over two seasons in two villages. Farmers proved to be willing participants and made selections in the segregating material, often with great success. Large differences in farmers' preferences between the F5 bulks were found and the most preferred were adopted rapidly. The most adopted variety, Machhapuchhre-3, performed well in the formal trials system, and much better than the products from conventional centralized breeding. The PPB programme increased biodiversity in the two participating villages.

Farmer Participatory Crop Improvement. III. Participatory Plant Breeding, a Case Study for Rice in Nepal

1996 ◽  
Vol 32 (4) ◽  
pp. 479-496 ◽  
Author(s):  
B. R. Sthapit ◽  
K. D. Joshi ◽  
J. R. Witcombe
Keyword(s):  
Plant Breeding ◽  
High Altitude ◽  
Crop Improvement ◽  
Participatory Plant Breeding ◽  
Great Success ◽  
Farmer Participation ◽  
Use Of Resources ◽  
Participatory Crop Improvement ◽  
Better Than

SUMMARYA participatory plant breeding (PPB) programme was conducted for the high altitude areas of Nepal. The aim was to breed acceptable varieties with minimum use of resources and to utilize farmers' knowledge in the PPB programme. Farmer participation began at the F5 stage and progress was followed over two seasons in two villages. Farmers proved to be willing participants and made selections in the segregating material, often with great success. Large differences in farmers' preferences between the F5 bulks were found and the most preferred were adopted rapidly. The most adopted variety, Machhapuchhre-3, performed well in the formal trials system, and much better than the products from conventional centralized breeding. The PPB programme increased biodiversity in the two participating villages.

Farmer Participatory Crop Improvement. II. Participatory Varietal Selection, a Case Study in India

1996 ◽  
Vol 32 (4) ◽  
pp. 461-477 ◽  
Author(s):  
A. Joshi ◽  
J. R. Witcombe
Keyword(s):  
Crop Improvement ◽  
Farmer Participation ◽  
Participatory Varietal Selection ◽  
Systematic Testing ◽  
Varietal Identification ◽  
Resource Poor ◽  
New Crop ◽  
Participatory Crop Improvement ◽  
New Cultivars

SUMMARYFarmer participatory varietal selection (PVS) was used to identify farmer-acceptable cultivars of rice and chickpea. Farmers' requirements in new crop cultivars (varieties) were determined, a search was carried out for released and non-released cultivars that matched these needs, and they were tested in farmer-managed, participatory trials. Farmer-acceptable cultivars were found amongst released material, but not among the recommended material for the area. Lack of adoption is, therefore, because resource-poor farmers have not been recommended or exposed to the most appropriate cultivars under the existing system of varietal identification and popularization. Adoption rates of cultivars would be improved by increased farmer participation, the systematic testing in zonal trials of locally popular cultivars to define their domains properly, a more liberal release system, and a more open system of providing seeds of new cultivars to farmers.

Farmer Participatory Crop Improvement. II. Participatory Varietal Selection, a Case Study in India

1996 ◽  
Vol 32 (4) ◽  
pp. 461-477 ◽  
Author(s):  
A. Joshi ◽  
J. R. Witcombe
Keyword(s):  
Crop Improvement ◽  
Farmer Participation ◽  
Participatory Varietal Selection ◽  
Systematic Testing ◽  
Varietal Identification ◽  
Resource Poor ◽  
New Crop ◽  
Participatory Crop Improvement ◽  
New Cultivars

SUMMARYFarmer participatory varietal selection (PVS) was used to identify farmer-acceptable cultivars of rice and chickpea. Farmers' requirements in new crop cultivars (varieties) were determined, a search was carried out for released and non-released cultivars that matched these needs, and they were tested in farmer-managed, participatory trials. Farmer-acceptable cultivars were found amongst released material, but not among the recommended material for the area. Lack of adoption is, therefore, because resource-poor farmers have not been recommended or exposed to the most appropriate cultivars under the existing system of varietal identification and popularization. Adoption rates of cultivars would be improved by increased farmer participation, the systematic testing in zonal trials of locally popular cultivars to define their domains properly, a more liberal release system, and a more open system of providing seeds of new cultivars to farmers.

Farmer Participatory Crop Improvement. I. Varietal Selection and Breeding Methods and Their Impact on Biodiversity

1996 ◽  
Vol 32 (4) ◽  
pp. 445-460 ◽  
Author(s):  
J. R. Witcombe ◽  
A. Joshi ◽  
K. D. Joshi ◽  
B. R. Sthapit
Keyword(s):  
Plant Breeding ◽  
Crop Improvement ◽  
Cost Effective ◽  
Participatory Plant Breeding ◽  
Participatory Varietal Selection ◽  
Farmer Participatory Research ◽  
Long Term Effect ◽  
Impact On Biodiversity ◽  
The Impact

SUMMARYFarmer participatory approaches for the identification or breeding of improved crop cultivars can be usefully categorized into participatory varietal selection (PVS) and participatory plant breeding (PPB). Various PVS and PPB methods are reviewed. PVS is a more rapid and cost-effective way of identifying farmer-preferred cultivars if a suitable choice of cultivars exists. If this is impossible, then the more resource-consuming PPB is required. PPB can use, as parents, cultivars that were identified in successful PVS programmes. Compared with conventional plant breeding, PPB is more likely to produce farmer-acceptable products, particularly for marginal environments. The impact of farmer participatory research on biodiversity is considered. The long-term effect of PVS is to increase biodiversity, but where indigenous variability is high it can also reduce it. PPB has a greater effect on increasing biodiversity although its impact may be limited to smaller areas. PPB can be a dynamic form of in situ genetic conservation.

Breeding for organic and low-input farming systems: An evolutionary–participatory breeding method for inbred cereal grains

2005 ◽  
Vol 20 (1) ◽  
pp. 48-55 ◽  
Author(s):  
Kevin Murphy ◽  
Doug Lammer ◽  
Steve Lyon ◽  
Brady Carter ◽  
Stephen S. Jones
Keyword(s):  
Plant Breeding ◽  
Crop Improvement ◽  
Small Scale ◽  
Mass Selection ◽  
Participatory Plant Breeding ◽  
Breeding Method ◽  
Plant Seed ◽  
Low Input ◽  
Farmer Selection ◽  
Participatory Breeding

AbstractOrganic and low-input farmers often plant seed varieties that have been selected under conventional practices, traditionally including high inputs of artificial fertilizers, crop protection chemicals and/or water. In addition, these crops are often selected in environments that may or may not represent the local environment of the farmer. An evolutionary participatory breeding (EPB) method emphasizes the utilization of natural selection in combination with site-specific farmer selection in early segregating generations of a heterogeneous crop population. EPB is a combination of two specific breeding methods, evolutionary breeding and participatory plant breeding. Evolutionary breeding has been shown to increase yield, disease resistance, genetic diversity and adaptability of a crop population over time. It is based on a mass selection technique used by farmers for over 10,000 years of crop improvement. Participatory plant breeding programs originated in developing countries to meet the needs of low-input, small-scale farmers in marginal environments who were often overlooked by conventional crop breeders. The EPB method is an efficient breeding system uniquely suited to improving crop varieties for the low-input and organic farmer. The EPB method utilizes the skills and knowledge of both breeders and farmers to develop heterogeneous landrace populations, and is an effective breeding method for both traditional and modern farmers throughout the world.

Farmer Participatory Crop Improvement. I. Varietal Selection and Breeding Methods and Their Impact on Biodiversity

1996 ◽  
Vol 32 (4) ◽  
pp. 445-460 ◽  
Author(s):  
J. R. Witcombe ◽  
A. Joshi ◽  
K. D. Joshi ◽  
B. R. Sthapit
Keyword(s):  
Plant Breeding ◽  
Crop Improvement ◽  
Cost Effective ◽  
Participatory Plant Breeding ◽  
Participatory Varietal Selection ◽  
Farmer Participatory Research ◽  
Long Term Effect ◽  
Impact On Biodiversity ◽  
The Impact

SUMMARYFarmer participatory approaches for the identification or breeding of improved crop cultivars can be usefully categorized into participatory varietal selection (PVS) and participatory plant breeding (PPB). Various PVS and PPB methods are reviewed. PVS is a more rapid and cost-effective way of identifying farmer-preferred cultivars if a suitable choice of cultivars exists. If this is impossible, then the more resource-consuming PPB is required. PPB can use, as parents, cultivars that were identified in successful PVS programmes. Compared with conventional plant breeding, PPB is more likely to produce farmer-acceptable products, particularly for marginal environments. The impact of farmer participatory research on biodiversity is considered. The long-term effect of PVS is to increase biodiversity, but where indigenous variability is high it can also reduce it. PPB has a greater effect on increasing biodiversity although its impact may be limited to smaller areas. PPB can be a dynamic form of in situ genetic conservation.

Municipal wastewater treatment with pond–constructed wetland system: a case study

2005 ◽  
Vol 51 (12) ◽  
pp. 325-329 ◽  
Author(s):  
X. Wang ◽  
X. Bai ◽  
J. Qiu ◽  
B. Wang
Keyword(s):  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Oxidation Pond ◽  
System A ◽  
Treated Effluent ◽  
Wetland System ◽  
Oxidation Ponds ◽  
Better Than

The performance of a pond–constructed wetland system in the treatment of municipal wastewater in Kiaochow city was studied; and comparison with oxidation ponds system was conducted. In the post-constructed wetland, the removal of COD, TN and TP is 24%, 58.5% and 24.8% respectively. The treated effluent from the constructed wetland can meet the Chinese National Agricultural and Irrigation Standard. The comparison between pond–constructed wetland system and oxidation pond system shows that total nitrogen removal in a constructed wetland is better than that in an oxidation pond and the TP removal is inferior. A possible reason is the low dissolved oxygen concentration in the wetland. Constructed wetlands can restrain the growth of algae effectively, and can produce obvious ecological and economical benefits.

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