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Effect of seed hardening on establishment, growth and productivity of semi-dry rice
Studies involving laboratory and field experiments were conducted during kharif 2000 at the College of Horticulture, Vellanikkara to investigate the effect of seed hardening treatments on imparting moisture stress tolerance in semi-dry rice and its subsequent effect on germination, establishment,...
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| Formato: | Ph.D Thesis |
| Lenguaje: | Undetermined |
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Vellanikkara
Department of Agronomy, College of Horticulture
2001
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| Sumario: | Studies involving laboratory and field experiments were conducted
during kharif 2000 at the College of Horticulture, Vellanikkara to investigate
the effect of seed hardening treatments on imparting moisture stress tolerance in
semi-dry rice and its subsequent effect on germination, establishment, seedling
vigour, growth, yield attributes and yield of the crop.
The treatments, thirteen in number, consisted of hardening the seeds
with aqueous solutions/slurries or combination of both, of different materials
such as salts, plant protection chemicals, botanicals, organic manures,
biofertilizers etc.
The effect of the treatments was more conspicuous in the laboratory
study, showing significant variation in respect of most of the parameters
studied. Hardening with imidacloprid (0.05%), Azospirillum (2.0%) and leaf
extract of Ungu (l.0%) generally recorded the best results in respect of
germination percentage and seedling parameters.
In the field ,study hardening with imidacloprid (0.05%) and
Azospirillum (2.0%) were found to be consistently superior in hastening
germination, maintaining adequate seedling population, reducing seedling
mortality and producing healthy seedlings. Growth components and root
characters showed significant improvement due to seed hardening, with
imidacloprid and Azosprillum recording the best results.
The yield increase due to seed hardening, over control, ranged from
0.6 to 2.1 t ha". Imidaclopridand Azosprillum continued to record superior
performance in respect of yield and yield attributes, also. KCl, KH2P04 and
Ungu recorded significantly higher grain yield, over control, but was inferior to
imidacloprid.
The NPK uptake by the crop was significantly influenced by seed
hardening treatments at almost all the growth stages, with imidacloprid and
Azosprillum recording highest values in most of the cases.
The study clearly revealed the effectiveness of seed hardening in
realizing high yields in rainfed semi-dry rice through amelioration of moisture
stress during the early growth stages.
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