|
in
| Title : |
Agronomical investigation on drought tolerant rice in mid-western Terai of Nepal |
| Material Type: |
printed text |
| Authors: |
Krishna Kumar Mishra |
| Pagination: |
229-240 p. |
| Languages : |
English (eng) |
| Keywords: |
Drought tolerant rice ; water scarcity |
| Abstract: |
Drought is the major constraint to rice production in rain fed areas ofNepal. In the context of
current and predicted water scarcity, increasing irrigation is generally not a viable option for
alleviating drought problems in rain fed rice-growing systems. It is therefore important that
agronomic and genetic management strategies should be followed for drought focusing on
maximum extraction of available soil moisture and its efficient utilization in crop
establishment and growth to maximize biomass and yield. A field experiment was conducted
during rainy season of 2011 to 2012 at Regional Agriculture Research Station, Nepalgunj
with an objective to find out the nutrients requirement of rice and the interaction effect
between nutrient and genotypes. Similarly, age of seedlings experiment with an objective of
studying the genotype effect, age of seedling effect and their interaction effect in drought
tolerant genotypes of rice was conducted. The trust was given to select genotypes with
different age of seedlings which perform well under a range of transplanting condition. The
yield differences recorded on different treatments in nutrient management. Grain yield
obtained at 90: 60 : 40 kg N, P205 and K20 /ha was statistically significantly superior over
control and 45 :30:20 kg N, P205 and K20 /ha. Interaction effect of different nutrients levels and
genotypes on grain yield was found significant, Rice genotypes impacted grain yield when
averaged over the nutrient Level. IR83388-B-B-108-3 (4360kg/ha) produced the highest mean
grain yield followed by, IR83383-B-B-129-4 (4278kg/ha) and IR83383-B-B-129-3
(4185kg/ha). Age of seedling impacted rice grain yield significantly, The overall mean grain
yields obtained from different seedling age revealed a 61.83 kg/ha/day yield loss up to 35
days old seedling planting whereas 45 days old seedling planting caused 65 .29 kg/ha/day
yield loss compare to 25 days old seedling transplanting. Similarly rice genotype impacted
rice grain yield when averaged over the age of seedling. IR83383-B-B-129-3 produced the
highest mean grain yield (4310 kglha) followed by IR83388-B-B-108-3(3843 kg/ha) and
IR83383-B-B-129-4 (3 711 kg/ha) respectively. Rice genotypes interacted with seedling age in
producing rice grain yields. Change either in seedling age or in rice genotypes would impact
rice grain yields. IR82589-B-B-84-3 , IR80463-B-39-3 and Sukha Dhan 1 were stable
genotypes in producing grain yields up to 35 days old seedling as no significant reduction in
grain yield was seen but after 35 days, yield were reduced significantly in all genotypes. |
| Link for e-copy: |
http://elibrary.narc.gov.np/?r=902 |
in
Agronomical investigation on drought tolerant rice in mid-western Terai of Nepal [printed text] / Krishna Kumar Mishra . - [s.d.] . - 229-240 p. Languages : English ( eng) | Keywords: |
Drought tolerant rice ; water scarcity |
| Abstract: |
Drought is the major constraint to rice production in rain fed areas ofNepal. In the context of
current and predicted water scarcity, increasing irrigation is generally not a viable option for
alleviating drought problems in rain fed rice-growing systems. It is therefore important that
agronomic and genetic management strategies should be followed for drought focusing on
maximum extraction of available soil moisture and its efficient utilization in crop
establishment and growth to maximize biomass and yield. A field experiment was conducted
during rainy season of 2011 to 2012 at Regional Agriculture Research Station, Nepalgunj
with an objective to find out the nutrients requirement of rice and the interaction effect
between nutrient and genotypes. Similarly, age of seedlings experiment with an objective of
studying the genotype effect, age of seedling effect and their interaction effect in drought
tolerant genotypes of rice was conducted. The trust was given to select genotypes with
different age of seedlings which perform well under a range of transplanting condition. The
yield differences recorded on different treatments in nutrient management. Grain yield
obtained at 90: 60 : 40 kg N, P205 and K20 /ha was statistically significantly superior over
control and 45 :30:20 kg N, P205 and K20 /ha. Interaction effect of different nutrients levels and
genotypes on grain yield was found significant, Rice genotypes impacted grain yield when
averaged over the nutrient Level. IR83388-B-B-108-3 (4360kg/ha) produced the highest mean
grain yield followed by, IR83383-B-B-129-4 (4278kg/ha) and IR83383-B-B-129-3
(4185kg/ha). Age of seedling impacted rice grain yield significantly, The overall mean grain
yields obtained from different seedling age revealed a 61.83 kg/ha/day yield loss up to 35
days old seedling planting whereas 45 days old seedling planting caused 65 .29 kg/ha/day
yield loss compare to 25 days old seedling transplanting. Similarly rice genotype impacted
rice grain yield when averaged over the age of seedling. IR83383-B-B-129-3 produced the
highest mean grain yield (4310 kglha) followed by IR83388-B-B-108-3(3843 kg/ha) and
IR83383-B-B-129-4 (3 711 kg/ha) respectively. Rice genotypes interacted with seedling age in
producing rice grain yields. Change either in seedling age or in rice genotypes would impact
rice grain yields. IR82589-B-B-84-3 , IR80463-B-39-3 and Sukha Dhan 1 were stable
genotypes in producing grain yields up to 35 days old seedling as no significant reduction in
grain yield was seen but after 35 days, yield were reduced significantly in all genotypes. |
| Link for e-copy: |
http://elibrary.narc.gov.np/?r=902 |
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