Search results
3 result(s) search for keyword(s) 'category,'
Refine your search
Economics of Dairy Farming: A Case Study of Phulbari Village in Chitwan District of Nepal / Krishna P. Timsina in Nepal Agriculture Research Journal, Vol.10 (2010)
[article]
Title : Economics of Dairy Farming: A Case Study of Phulbari Village in Chitwan District of Nepal Material Type: printed text Authors: Krishna P. Timsina, Author Publication Date: 2010 Article on page: 55-63p. Languages : English (eng) Keywords: Commercialization, Farm category, Milk Link for e-copy: http://elibrary.narc.gov.np/?r=1204
in Nepal Agriculture Research Journal > Vol.10 (2010) . - 55-63p.[article] Economics of Dairy Farming: A Case Study of Phulbari Village in Chitwan District of Nepal [printed text] / Krishna P. Timsina, Author . - 2010 . - 55-63p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol.10 (2010) . - 55-63p.
Keywords: Commercialization, Farm category, Milk Link for e-copy: http://elibrary.narc.gov.np/?r=1204 Pollen and Spikelet Analysis in F1 Rice Hybrids and their Parents / Joshi, Bal K. in Nepal Agriculture Research Journal, Vol. 8 (2007)
[article]
Title : Pollen and Spikelet Analysis in F1 Rice Hybrids and their Parents Material Type: printed text Authors: Joshi, Bal K., Author ; Laxmi P. Subedi, Author ; Santa B. Gurung, Author Publication Date: 2007 Article on page: 120-126 p General note: Research note Languages : English (eng) Keywords: Correlation, F1 rice, pollen category, regression coefficient Abstract: Pollen analysis can be used to discriminate between different species, identify possible
interspecies hybrids, identify restorer and maintainer lines, useful to study genetics of
restorer gene, interaction between chromosome and cytoplasm and relationship between
parents. Pollen abortion system of male sterility is an important tool in hybrid rice
production and spikelet is the major yield components. Nine improved cultivars, six
landraces and three wild aborted cytoplasmic-genetic male sterile (CMS) lines were used to
analyze pollen and spikelet in F1 rice hybrids and their parents. The frequency of pollen
categories and its relationship to spikelet fertility were investigated. Pollen sterility of the
F1s was determined by staining pollen grains in 1% potassium iodide-iodine (I-KI) solution.
Spikelet fertility was determined by counting the total number of seed set in proportion to
the total number of spikelets. Correlation and regression coefficients for some traits were
computed. In hybrids, pollen fertility ranged from 0.5 to 82% and spikelet fertility from 0 to
87%. Pollen fertility varied from 28 to 97%, while spikelet fertility from 73 to 91% in pollen
parents. The highest and the lowest percentages of pollen fertility were found in Chaite-6
and Chiunde cultivars respectively. Spikelet fertility percentage varied widely among
hybrids and many hybrids had lower spikelet fertility percentage than their parents.
Therefore, it is of practical importance to understand the causes of high spikelet sterility in
hybrids for possible increase in spikelet fertility. Highly significant positive correlation was
found between stained round fertile (SRF) pollen and spikelet fertility. The positive value of
correlation and regression coefficient on SRF and spikelet fertility were found between F1
and mid parent, and F1 and male parent. High fertility of cross may be due to the presence of
a wide compatibility gene or restorer genes in the cultivar. Lower pollen and spikelet
fertility of the crosses was attributed to effect of the genetic background of the tester parent.Link for e-copy: http://elibrary.narc.gov.np/?r=37
in Nepal Agriculture Research Journal > Vol. 8 (2007) . - 120-126 p[article] Pollen and Spikelet Analysis in F1 Rice Hybrids and their Parents [printed text] / Joshi, Bal K., Author ; Laxmi P. Subedi, Author ; Santa B. Gurung, Author . - 2007 . - 120-126 p.
Research note
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 8 (2007) . - 120-126 p
Keywords: Correlation, F1 rice, pollen category, regression coefficient Abstract: Pollen analysis can be used to discriminate between different species, identify possible
interspecies hybrids, identify restorer and maintainer lines, useful to study genetics of
restorer gene, interaction between chromosome and cytoplasm and relationship between
parents. Pollen abortion system of male sterility is an important tool in hybrid rice
production and spikelet is the major yield components. Nine improved cultivars, six
landraces and three wild aborted cytoplasmic-genetic male sterile (CMS) lines were used to
analyze pollen and spikelet in F1 rice hybrids and their parents. The frequency of pollen
categories and its relationship to spikelet fertility were investigated. Pollen sterility of the
F1s was determined by staining pollen grains in 1% potassium iodide-iodine (I-KI) solution.
Spikelet fertility was determined by counting the total number of seed set in proportion to
the total number of spikelets. Correlation and regression coefficients for some traits were
computed. In hybrids, pollen fertility ranged from 0.5 to 82% and spikelet fertility from 0 to
87%. Pollen fertility varied from 28 to 97%, while spikelet fertility from 73 to 91% in pollen
parents. The highest and the lowest percentages of pollen fertility were found in Chaite-6
and Chiunde cultivars respectively. Spikelet fertility percentage varied widely among
hybrids and many hybrids had lower spikelet fertility percentage than their parents.
Therefore, it is of practical importance to understand the causes of high spikelet sterility in
hybrids for possible increase in spikelet fertility. Highly significant positive correlation was
found between stained round fertile (SRF) pollen and spikelet fertility. The positive value of
correlation and regression coefficient on SRF and spikelet fertility were found between F1
and mid parent, and F1 and male parent. High fertility of cross may be due to the presence of
a wide compatibility gene or restorer genes in the cultivar. Lower pollen and spikelet
fertility of the crosses was attributed to effect of the genetic background of the tester parent.Link for e-copy: http://elibrary.narc.gov.np/?r=37 Red Listing of Agricultural Crop Species, Varieties and Landraces / Joshi, Bal K. in Nepal Agriculture Research Journal, Vol. 5 (2004)
[article]
Title : Red Listing of Agricultural Crop Species, Varieties and Landraces Material Type: printed text Authors: Joshi, Bal K., Author ; ,Upadhyay, Madhusudan, Author ; Gauchan, Devendra, Author ; Sthapit, Bhuwan R., Author ; Joshi, K.D., Author Publication Date: 2004 Article on page: 73-79 p General note: Review article Languages : English (eng) Keywords: Agricultural crops, conservation, on farm, red list category, red-listing criteria Abstract: Red listing mechanism has been developed for wild fauna and flora. There are several
documents illustrating red listed wild fauna and flora. But there is a lack of information on the
red list and red listing criteria of agricultural crop species, varieties or landraces. For initiating
on- farm, in situ and ex situ conservations, red listing is helpful in locating region of crop
species, varieties or landraces diversity. The paper reviewed the red listing criteria used for the
categorization of wild fauna and flora. Categorization of on-farm crop species, varieties and
landraces is based on population, ecological, social, modernization and use criteria. Among
them ecological, social and modernization criteria are useful in selecting location for sampling
materials for ex situ conservation and appropriate sites for in situ conservation. Modernization
and use criteria are suitable for categorization of crop genotypes. Combinations of these criteria
are proposed for red listing crop genotypes and areas.Link for e-copy: http://elibrary.narc.gov.np/?r=84
in Nepal Agriculture Research Journal > Vol. 5 (2004) . - 73-79 p[article] Red Listing of Agricultural Crop Species, Varieties and Landraces [printed text] / Joshi, Bal K., Author ; ,Upadhyay, Madhusudan, Author ; Gauchan, Devendra, Author ; Sthapit, Bhuwan R., Author ; Joshi, K.D., Author . - 2004 . - 73-79 p.
Review article
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 5 (2004) . - 73-79 p
Keywords: Agricultural crops, conservation, on farm, red list category, red-listing criteria Abstract: Red listing mechanism has been developed for wild fauna and flora. There are several
documents illustrating red listed wild fauna and flora. But there is a lack of information on the
red list and red listing criteria of agricultural crop species, varieties or landraces. For initiating
on- farm, in situ and ex situ conservations, red listing is helpful in locating region of crop
species, varieties or landraces diversity. The paper reviewed the red listing criteria used for the
categorization of wild fauna and flora. Categorization of on-farm crop species, varieties and
landraces is based on population, ecological, social, modernization and use criteria. Among
them ecological, social and modernization criteria are useful in selecting location for sampling
materials for ex situ conservation and appropriate sites for in situ conservation. Modernization
and use criteria are suitable for categorization of crop genotypes. Combinations of these criteria
are proposed for red listing crop genotypes and areas.Link for e-copy: http://elibrary.narc.gov.np/?r=84