Comparing farmers and breeders rankings in varietal selection for low-input environments: A case study of rainfed rice in eastern India |
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Authors: | B Courtois B Bartholome D Chaudhary G McLaren CH Misra NP Mandal S Pandey T Paris C Piggin K Prasad AT Roy RK Sahu VN Sahu S Sarkarung SK Sharma A Singh HN Singh ON Singh NK Singh RK Singh RK Singh S Singh PK Sinha BVS Sisodia R Takhur |
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Institution: | (1) International Rice Research Institute, MCPO Box 3127, 1271 Makati City, Philippines;(2) Central Rainfed Upland Rice Research Station, P.O. Box 48, Hazaribagh, Bihar, India;(3) Indira Gandhi Agricultural University, F/2 Krishak Nagar, Raipur, 492 012 Madhya Pradesh, India;(4) Narendra Deva University of Agriculture and Technology, Kumarganj, Faizabad, 224 229 Uttar Pradesh, India;(5) Central Rice Research Institute, Cuttack, 753 006 Orissa, India;(6) Orissa University of Agriculture and Technology, Bhubaneswar, 751003 Orissa, India;(7) Rajendra Agricultural University, Pusa, Samastipur, 848125 Bihar, India |
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Abstract: | A number of breeding institutions developed a project to assess importance of participatory plant breeding approaches for
rainfed rice improvement in eastern India. The results of the first two years of participatory varietal selection are reported
here. The objective was to evaluate the respective effects of participation of farmers in varietal evaluation and decentralization
of varietal testing from breeding stations to farmers' fields on varietal ranking. Fields representing various hydrological
situations were chosen in two to three villages at four rainfed lowland sites and one upland site. Sets of 15 to 25 varieties
were tested both in farmers' fields and on-station in 1997 and 1998 and ranked by both farmers and breeders. The effect of
participation was judged by comparing the rankings attributed by farmers and breeders to a given set of material in a given
trial. The effect of decentralization was determined through comparisons between individual breeders' rankings across trials.
Farmers' rankings were not randomly allocated, but agreement within the farmers' group was not always very strong. Except
at one site, concordance among breeders' ranking was high, but, because of the limited number of breeders involved, it was
seldom significant. In about two-thirds of the trials, there was a good agreement between farmers' and breeders' mean rankings.
The consensus was particularly strong when severe constraints induced contrasting behavior in the genotypes. The decentralization
effect appeared to be moderate, but variations due to a breeder effect were recorded. The part of genotype by environment
interactions for grain yield due to location within one site and year was evaluated through various methods, showing more
effect of G × E interactions at some sites than at others. Crossover interactions inducing changes in ranks represented a
limited part of the yearly G × E interactions at all sites. Both farmer participation and decentralization of varietal testing
in farmers' field would help in best matching the varieties to the needs, although their combined contribution would be more
useful in some sites than in others.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | cross-over interactions eastern India genotype by environment interactions participatory varietal selection rainfed rice ranking selection criteria |
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