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7 result(s) search for keyword(s) 'loss' 
Refine your searchYield Loss and Economic Threshold Level of Soybean due to Leaf Roller (Apoderus Cyaneus Hope) in Nepal / Gyawali, Bishnu K. in Nepal Agriculture Research Journal, Vol. 6 (2005)
Title : Yield Loss and Economic Threshold Level of Soybean due to Leaf Roller (Apoderus Cyaneus Hope) in Nepal Material Type: printed text Authors: Gyawali, Bishnu K., Author Publication Date: 2005 Article on page: 73-77 p Languages : English (eng) Keywords: Economic threshold level, leaf roller, physiological growth stages, yield loss Abstract: Yield loss in soybean due to leaf roller (Apoderus cyaneus Hope) was studied at Khumaltar during
1985 and 1986 seasons. Field experiments were conducted during vegetative as well as reproductive
stages of soybean. Rolled leaves of soybean with eggs, grubs and pupae were collected from the
field and reared in the laboratory for adults. Adults were introduced into nylon cages installed at
the central rows of each plot just after germination of soybean. Insects were maintained at
population density of 25, 50 and 100 per m2. At maximum (100) adult density, the potential grain
yield loss of cultivar, Ransom soybean in its vegetative and reproductive stages were 103 and 48 mg
per day respectively from each adult of A. cyaneus. Percentages of yield losses were 36.2, 45.2,
and 58.0 during vegetative and 37.5, 48.5 and 66.0 during reproductive stages from the insect
population of 25, 50 and 100, respectively which, was
not in accordance with the level of two and four fold increased population density of insect. Yield
reduction was higher (260 and 108 mg per day) from each adult beetle at lower population level (25)
in both vegetative and reproductive stages of soybean.Link for e-copy: http://elibrary.narc.gov.np/?r=64
in Nepal Agriculture Research Journal > Vol. 6 (2005) . - 73-77 p[article] Yield Loss and Economic Threshold Level of Soybean due to Leaf Roller (Apoderus Cyaneus Hope) in Nepal [printed text] / Gyawali, Bishnu K., Author . - 2005 . - 73-77 p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 6 (2005) . - 73-77 p
Keywords: Economic threshold level, leaf roller, physiological growth stages, yield loss Abstract: Yield loss in soybean due to leaf roller (Apoderus cyaneus Hope) was studied at Khumaltar during
1985 and 1986 seasons. Field experiments were conducted during vegetative as well as reproductive
stages of soybean. Rolled leaves of soybean with eggs, grubs and pupae were collected from the
field and reared in the laboratory for adults. Adults were introduced into nylon cages installed at
the central rows of each plot just after germination of soybean. Insects were maintained at
population density of 25, 50 and 100 per m2. At maximum (100) adult density, the potential grain
yield loss of cultivar, Ransom soybean in its vegetative and reproductive stages were 103 and 48 mg
per day respectively from each adult of A. cyaneus. Percentages of yield losses were 36.2, 45.2,
and 58.0 during vegetative and 37.5, 48.5 and 66.0 during reproductive stages from the insect
population of 25, 50 and 100, respectively which, was
not in accordance with the level of two and four fold increased population density of insect. Yield
reduction was higher (260 and 108 mg per day) from each adult beetle at lower population level (25)
in both vegetative and reproductive stages of soybean.Link for e-copy: http://elibrary.narc.gov.np/?r=64
in Rice research in Nepal : Proceedings of 24th National Summer Crops Research Workshop, Khumaltar, Lalitpur, 30-31 June 2004 / Adhikari, N.P.
Title : Floodwater chemistry of lowland rice in mid-hill region of Nepal Material Type: printed text Authors: Junoo K Tuladhar Pagination: 288-297 p. Languages : English (eng) Keywords: Ammonia volatilization ; nitrogen loss paddy soils Abstract: The chemistry of important plant nutrients in flooded paddy soil is different from that in
drained mil particularly nitrogen transformation. This affects not only the amount of
available nitrogen but also influences global N budgets. Among N transformation, losses of
N from the paddy soils in the form of ammonia are important. High temperature combined
with high floodwater pH during the day (effect of activity the photosynthetic aquatic
biomass) favor the loss of newly applied mineral fertilizer N through ammonia volatilization.
In order to know the situation of floodwater chemistry of mid-hill region and chances of N
losses from ammonia volatilization, the experiment was conducted for lowland rice in
farmers' field of Bageshwori village in year 2001 and 2002. Floodwater was measured for
pH temperature, ammoniacal N concentration, and ammonia partial pressure for the first ten
days following the application of the urea. Over the study period of ten days, the mean pH
variedji-om 4.2 to 7.8 in 2001 and 3.6-8.7 in 2002. Thefloodwater temperature variedfrom
29 ° C to 43 o C in 2001 and 30 ° C to 42 '(' in 2002. The mean ammonia/ N concentration
ranged from 0.24 to 25.6 g N m·3 ill both years. The partial pressure observed in the
floodwater was varied from negligible to 0.98 Pa depending on the treatments. Among the
several practices to reduce N losses from floodwater, in this experiment aquatic fern Azolla
was used to cover floodwater. The A.zolla cover had significant effect on reduction of pH,
temperature and partial pressure of the floodwater thus reduce the potential for ammonia
volatilization. The floodwater chemistry should alsq be studied for inner terai and terai
region of; lepal where temperature of the region is high and the soils are .alkaline and where
potential of N losses due to ammonia volatilization may be more.Link for e-copy: http://elibrary.narc.gov.np/?r=1114 Floodwater chemistry of lowland rice in mid-hill region of Nepal [printed text] / Junoo K Tuladhar . - [s.d.] . - 288-297 p.
in Rice research in Nepal : Proceedings of 24th National Summer Crops Research Workshop, Khumaltar, Lalitpur, 30-31 June 2004 / Adhikari, N.P.
Languages : English (eng)
Keywords: Ammonia volatilization ; nitrogen loss paddy soils Abstract: The chemistry of important plant nutrients in flooded paddy soil is different from that in
drained mil particularly nitrogen transformation. This affects not only the amount of
available nitrogen but also influences global N budgets. Among N transformation, losses of
N from the paddy soils in the form of ammonia are important. High temperature combined
with high floodwater pH during the day (effect of activity the photosynthetic aquatic
biomass) favor the loss of newly applied mineral fertilizer N through ammonia volatilization.
In order to know the situation of floodwater chemistry of mid-hill region and chances of N
losses from ammonia volatilization, the experiment was conducted for lowland rice in
farmers' field of Bageshwori village in year 2001 and 2002. Floodwater was measured for
pH temperature, ammoniacal N concentration, and ammonia partial pressure for the first ten
days following the application of the urea. Over the study period of ten days, the mean pH
variedji-om 4.2 to 7.8 in 2001 and 3.6-8.7 in 2002. Thefloodwater temperature variedfrom
29 ° C to 43 o C in 2001 and 30 ° C to 42 '(' in 2002. The mean ammonia/ N concentration
ranged from 0.24 to 25.6 g N m·3 ill both years. The partial pressure observed in the
floodwater was varied from negligible to 0.98 Pa depending on the treatments. Among the
several practices to reduce N losses from floodwater, in this experiment aquatic fern Azolla
was used to cover floodwater. The A.zolla cover had significant effect on reduction of pH,
temperature and partial pressure of the floodwater thus reduce the potential for ammonia
volatilization. The floodwater chemistry should alsq be studied for inner terai and terai
region of; lepal where temperature of the region is high and the soils are .alkaline and where
potential of N losses due to ammonia volatilization may be more.Link for e-copy: http://elibrary.narc.gov.np/?r=1114 E-copies
http://nkcs.org.np/narc/dl/?r=1114URLOn-farm monitoring of improved management of farmyard manure and soil nutrient fertility in the middle hills of Nepal / B.K Bishwakarma
in Proceedings of the Second National Soil Fertility Research Workshop, 24-25 March, 2015. Soil Science Division, NARC, Khumaltar, Lalitpur, Nepal / Krishna B. Karki
Title : On-farm monitoring of improved management of farmyard manure and soil nutrient fertility in the middle hills of Nepal Material Type: printed text Authors: B.K Bishwakarma, Author ; R Allen, Author ; J Merz, Author ; Dhital, B.K., Author ; Rajbhandari, N.P., Author ; Shrestha, S.K., Author ; I.C Baillie, Author Pagination: 68-78 p. Languages : English (eng) Keywords: Farm yard manure (FYM), nutrient loss through leaching, organic matter, soil- nitrogen, topsoil. Abstract: Programmes to improve traditional soil management on the very small farms in the mid-hills of Nepal have previously recommended inorganic fertilizers as the main means of eN hancing soil fertility. Farmyard manure (FYM) applied mainly to improve soil physical properties. Since 2000, the Sustainable Soil Management Programme has promoted sustainable soil management practices giving greater prominence to FYM as a nutrient fertilizer by promoting improvements in its management and quality. FYM improvement involves: careful collection, layering, turning and moistening of the manure; shading heaps from sunlight to minimize N-volatilization; protecting heaps from rainfall to reduce nutrient loss through leaching; and the systematic collection and admixture of cattle and buffalo urine……………….
Link for e-copy: http://elibrary.narc.gov.np/?r=1779 On-farm monitoring of improved management of farmyard manure and soil nutrient fertility in the middle hills of Nepal [printed text] / B.K Bishwakarma, Author ; R Allen, Author ; J Merz, Author ; Dhital, B.K., Author ; Rajbhandari, N.P., Author ; Shrestha, S.K., Author ; I.C Baillie, Author . - [s.d.] . - 68-78 p.
in Proceedings of the Second National Soil Fertility Research Workshop, 24-25 March, 2015. Soil Science Division, NARC, Khumaltar, Lalitpur, Nepal / Krishna B. Karki
Languages : English (eng)
Keywords: Farm yard manure (FYM), nutrient loss through leaching, organic matter, soil- nitrogen, topsoil. Abstract: Programmes to improve traditional soil management on the very small farms in the mid-hills of Nepal have previously recommended inorganic fertilizers as the main means of eN hancing soil fertility. Farmyard manure (FYM) applied mainly to improve soil physical properties. Since 2000, the Sustainable Soil Management Programme has promoted sustainable soil management practices giving greater prominence to FYM as a nutrient fertilizer by promoting improvements in its management and quality. FYM improvement involves: careful collection, layering, turning and moistening of the manure; shading heaps from sunlight to minimize N-volatilization; protecting heaps from rainfall to reduce nutrient loss through leaching; and the systematic collection and admixture of cattle and buffalo urine……………….
Link for e-copy: http://elibrary.narc.gov.np/?r=1779 E-copies
http://nkcs.org.np/narc/dl/?r=1779URL
in Rice research in Nepal : Proceedings of 24th National Summer Crops Research Workshop, Khumaltar, Lalitpur, 30-31 June 2004 / Adhikari, N.P.
Title : Status of sheath blight disease of rice in central terai of Nepal Material Type: printed text Authors: DB Gharti ; J.B Sah, Author ; Shrestha, C.L., Author ; Khadge, B.R., Author Pagination: 353-362 p. Languages : English (eng) Keywords: Thanatephorus cucumeris ; rice sheath blight prevalance yield loss genetic resistance Abstract: This study consisted of field survey, yield loss assessment and disease screening nursery
undertaken at RARS, Parwanipur and its command area during 2001102 and 2002103 with a ·
view to know the status of sheath blight disease of rice in Central Terai of Nepal and plan
future research programs accordingly. Survey in few command districts revealed sheath
blight prevalence in 75. 7% surveyed fields. Farmers reported almost 28% yield loss due to
this disease in susceptible farmer adopted rice variety "Sona Masuli" However, yield loss
assessment at the research station showed 9. 44% yield loss in this particular variety. Yield
losses varied between 4. 77 to 9.44% in different varieties. However, yield differences
between sprayed and non- sprayed plots were non significant. Relative lesion height was
significantly different among the tested genotypes and between the spray treatments as well.
Sheath Blight Screening Nursery conducted during 2001102 and 2002103 indicated NR 1769- -
20-2-2-3-4 as resistant genotype to rice sheath blight. Genotypes/varieties like Pusa 834, NR
1558-76-1-1-2-3-1-2-3, FRX 29F3B-5F6BF7, FRX 29F5B-5F6BF8, Sabitri, Radha-11,
Jaya, NR 1743-1-2-4-1-2-2, BR 802-78-2-1, NR 1736-4-6-2-1-1-1 were found moderately
resistant over years.Link for e-copy: http://elibrary.narc.gov.np/?r=1123 Status of sheath blight disease of rice in central terai of Nepal [printed text] / DB Gharti ; J.B Sah, Author ; Shrestha, C.L., Author ; Khadge, B.R., Author . - [s.d.] . - 353-362 p.
in Rice research in Nepal : Proceedings of 24th National Summer Crops Research Workshop, Khumaltar, Lalitpur, 30-31 June 2004 / Adhikari, N.P.
Languages : English (eng)
Keywords: Thanatephorus cucumeris ; rice sheath blight prevalance yield loss genetic resistance Abstract: This study consisted of field survey, yield loss assessment and disease screening nursery
undertaken at RARS, Parwanipur and its command area during 2001102 and 2002103 with a ·
view to know the status of sheath blight disease of rice in Central Terai of Nepal and plan
future research programs accordingly. Survey in few command districts revealed sheath
blight prevalence in 75. 7% surveyed fields. Farmers reported almost 28% yield loss due to
this disease in susceptible farmer adopted rice variety "Sona Masuli" However, yield loss
assessment at the research station showed 9. 44% yield loss in this particular variety. Yield
losses varied between 4. 77 to 9.44% in different varieties. However, yield differences
between sprayed and non- sprayed plots were non significant. Relative lesion height was
significantly different among the tested genotypes and between the spray treatments as well.
Sheath Blight Screening Nursery conducted during 2001102 and 2002103 indicated NR 1769- -
20-2-2-3-4 as resistant genotype to rice sheath blight. Genotypes/varieties like Pusa 834, NR
1558-76-1-1-2-3-1-2-3, FRX 29F3B-5F6BF7, FRX 29F5B-5F6BF8, Sabitri, Radha-11,
Jaya, NR 1743-1-2-4-1-2-2, BR 802-78-2-1, NR 1736-4-6-2-1-1-1 were found moderately
resistant over years.Link for e-copy: http://elibrary.narc.gov.np/?r=1123 E-copies
http://nkcs.org.np/narc/dl/?r=1123URL
in Proceedings of the fifth National Seminar on Horticulture June 9-10, 2008 / Nepal Agricultural Research Council (NARC) (Khumaltar, Lalitpur, Nepal)
Title : Study on Post Harvest Shelf Life of Fresh Chilli and Drying .Structure Improvement for Red Ripe Chilli Material Type: printed text Authors: Ram Bahadur KC, Author ; Moha Datta Sharma, Author Pagination: 292-295 p. Languages : English (eng) Keywords: Chilli, drying, red ripe, shelf life, weight loss Abstract: Two post harvest studies were carried ·out on chill~ at Regional Agricultural Research
Station, Khajura during winter season 2006 to know the shelf life and identify
appropriate structure of drying for red ripe chilli. In shelf life study higher percent
weight toss trend (16.56, 30.31, 44.98 and 70.96) was observed in cultivar Pusa
Jwala followed by NS 1701 (13.96, 23.08, 33.78, 49.40 & 62.29) after every three
days of interval while the lowest percent weight loss trend was recorded in cultivar
Khairapur Mota (12.86, 20.78, 32.47, 46.66 & 59.12). Cultivar Pusa Jwala reached
early in un-marketable stage by shrinkage and blackish peduncle within 12 days
where as other two cultivar NS 1701 and Khairapur Mota had relatively long shelf life
15 and 18 days, respectively. Significantly higher percent weight loss (37.42, 59.34 &
76.33) was recorded in structure with black cotton sheeted Nang/a covered by
transparent thin poly sheet within nine days. Same level of weight loss was recorded
in black sheeted Nang/a and Nang/a as such after 12 days only. Result indicated that
the maximum shelf life was noted in cultivar Khairapur Mota followed by NS 1701
under ambient room condition. Black cotton sheeted Nang/a covered by transparent
thin polyethylene sheet structure was found the most effective for rapid drying of red
ripe chilli.Link for e-copy: http://elibrary.narc.gov.np/?r=263 Study on Post Harvest Shelf Life of Fresh Chilli and Drying .Structure Improvement for Red Ripe Chilli [printed text] / Ram Bahadur KC, Author ; Moha Datta Sharma, Author . - [s.d.] . - 292-295 p.
in Proceedings of the fifth National Seminar on Horticulture June 9-10, 2008 / Nepal Agricultural Research Council (NARC) (Khumaltar, Lalitpur, Nepal)
Languages : English (eng)
Keywords: Chilli, drying, red ripe, shelf life, weight loss Abstract: Two post harvest studies were carried ·out on chill~ at Regional Agricultural Research
Station, Khajura during winter season 2006 to know the shelf life and identify
appropriate structure of drying for red ripe chilli. In shelf life study higher percent
weight toss trend (16.56, 30.31, 44.98 and 70.96) was observed in cultivar Pusa
Jwala followed by NS 1701 (13.96, 23.08, 33.78, 49.40 & 62.29) after every three
days of interval while the lowest percent weight loss trend was recorded in cultivar
Khairapur Mota (12.86, 20.78, 32.47, 46.66 & 59.12). Cultivar Pusa Jwala reached
early in un-marketable stage by shrinkage and blackish peduncle within 12 days
where as other two cultivar NS 1701 and Khairapur Mota had relatively long shelf life
15 and 18 days, respectively. Significantly higher percent weight loss (37.42, 59.34 &
76.33) was recorded in structure with black cotton sheeted Nang/a covered by
transparent thin poly sheet within nine days. Same level of weight loss was recorded
in black sheeted Nang/a and Nang/a as such after 12 days only. Result indicated that
the maximum shelf life was noted in cultivar Khairapur Mota followed by NS 1701
under ambient room condition. Black cotton sheeted Nang/a covered by transparent
thin polyethylene sheet structure was found the most effective for rapid drying of red
ripe chilli.Link for e-copy: http://elibrary.narc.gov.np/?r=263 E-copies
http://nkcs.org.np/narc/dl/?r=263URL
