Abstract
A study was conducted in the Farm Machinery and Postharvest Technology Division, Bangladesh Rice Research Institute (BRRI), Gazipur in the irrigated dry season (Boro) of 2012-13. It was aimed at identifying the optimum seed rate of different graded rice variety for mat type seedlings preparation and suitable seedling adjustment option of the rice trans planter to maintain required number of seedlings dispensed per stroke by the rotary picker of the trans planter. Walk behind type 4-rows rice trans planter (DP 480) was used to conduct the study. The experiment was followed as two factorial completely randomized design (CRD) with three replications. Three categories of rice variety as short and bold grain (cv. BR3), medium and slender grain (cv. BRRI dhan28) and extra-long and slender grain (cv. BRRI dhan50) were considered as main factor whereas seed rate of 100, 120, 130, 140, 150 and 160g pertray (280×580×25 mm) were considered as sub-factor. Irrespective of rice category, seedling emergence decreased with the increase of seed rate. Seedling emergence decreased from 77 to 56, 74 to 57 and 77 to 54% in BR3, BRRI dhan28 and BRRI dhan29 respectively with the increase of seed rate from 100 to 160g per tray. Seed rate did not affect the seedling height significantly whereas it was varied with the rice verities only and BRRI dhan50 produced higher seedling length. However, number of leaf, stem thickness and shoot dry weight decreased and root-shoot ratio increased significantly with the increase of seed rate. The highest shoot dry weight was observed in BR3 followed by BRRI dhan50. Seedling strength also decreased with the increase of seed rate. The highest seedling strength (0.043 mg cm-1) was observed for the seed rate of 100g of BR3 and the lowest (0.020 mg cm-1) for the seed rate of 160g of BRRI dhan28. The number of seedling increased and percentage of missing hills decreased with the increase of both the seed rate and seedling adjustment option of the rice transplanter irrespective of variety. In case of BR3, seedling dispensed per stroke and percentage of missing hills varied from 4.3 to 5.7 and 6.8 to 7.8 for the seed rates of 140, 150 and 160 g of seeds tray-1 for 5 to 7 seedling adjustment option of the rice transplanter respectively. Seedlings per stroke and percentage of missing hills of BRRI dhan28 for the seed rate of 130, 140 and 150 g of seeds tray-1 was found almost same for 5 to 7 seedling adjustment options of the rice transplanter (4.2 to 6.3 and 5.7 to 9.8). However, there was minimum difference of seedlings per stroke and percentage of missing hills among 120, 130 and 140 g of seeds tray-1 for the option of 4 to 7 (4.0 to 5.6 and 3.9 to 7.8 respectively) for BRRI dhan50. It can be concluded that 140 g of seeds tray-1 for short and bold grain (BR3) and 130 g of seeds tray-1 for medium and slender grain (BRRI dhan28) under the seedling adjustment options of 5 to 7 and 120 g of seeds tray-1 for extra-long and slender grain (BRRI dhan50) under the seedling adjustment options of 4 to 7 may be used for desired seedlings per hill and minimum missing hills along with good quality of seedling. Bangladesh Rice j. 2018, 22(1): 9-23
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Claims 20
Claim · model-written summary
Higher seed rate reduced seedling emergence across rice categories.
- Taxon
- Rice
Oryza sativat0 - Treatment
- seed ratee0
- Outcome
- seedling emergencee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrespective of rice category, seedling emergence decreased with the increase of seed rate.”
t0“Rice”
Claim · model-written summary
BR3 emergence fell from 77 to 56% as seed rate rose from 100 to 160g per tray.
- Taxon
- RiceOryza sativat0
- Material
- BR3e0
- Treatment
- seed rate from 100 to 160g per traye0
- Outcome
- Seedling emergencee0
- Direction
- decreasede0
- Value
- 77 to 56e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedling emergence decreased from 77 to 56, 74 to 57 and 77 to 54% in BR3, BRRI dhan28 and BRRI dhan29 respectively with the increase of seed rate from 100 to 160g per tray.”
t0“Rice”
Claim · model-written summary
BRRI dhan28 emergence fell from 74 to 57% as seed rate rose.
- Taxon
- RiceOryza sativat0
- Material
- BRRI dhan28e0
- Treatment
- seed rate from 100 to 160g per traye0
- Outcome
- Seedling emergencee0
- Direction
- decreasede0
- Value
- 74 to 57e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedling emergence decreased from 77 to 56, 74 to 57 and 77 to 54% in BR3, BRRI dhan28 and BRRI dhan29 respectively with the increase of seed rate from 100 to 160g per tray.”
t0“Rice”
Claim · model-written summary
BRRI dhan29 emergence fell from 77 to 54% as seed rate rose.
- Taxon
- RiceOryza sativat0
- Material
- BRRI dhan29e0
- Treatment
- seed rate from 100 to 160g per traye0
- Outcome
- Seedling emergencee0
- Direction
- decreasede0
- Value
- 77 to 54%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedling emergence decreased from 77 to 56, 74 to 57 and 77 to 54% in BR3, BRRI dhan28 and BRRI dhan29 respectively with the increase of seed rate from 100 to 160g per tray.”
t0“Rice”
Claim · model-written summary
Seed rate did not significantly affect seedling height.
- Taxon
- RiceOryza sativat0
- Treatment
- Seed ratee0
- Outcome
- seedling heighte0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed rate did not affect the seedling height significantly whereas it was varied with the rice verities only and BRRI dhan50 produced higher seedling length.”
t0“Rice”
Claim · model-written summary
BRRI dhan50 had higher seedling length.
- Taxon
- RiceOryza sativat0
- Material
- BRRI dhan50e0
- Outcome
- seedling lengthe0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed rate did not affect the seedling height significantly whereas it was varied with the rice verities only and BRRI dhan50 produced higher seedling length.”
t0“Rice”
Claim · model-written summary
Increasing seed rate reduced leaf number, stem thickness and shoot dry weight.
- Taxon
- RiceOryza sativat0
- Treatment
- seed ratee0
- Outcome
- number of leaf, stem thickness and shoot dry weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, number of leaf, stem thickness and shoot dry weight decreased and root-shoot ratio increased significantly with the increase of seed rate.”
t0“Rice”
Claim · model-written summary
Increasing seed rate increased root-shoot ratio.
- Taxon
- RiceOryza sativat0
- Treatment
- seed ratee0
- Outcome
- root-shoot ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, number of leaf, stem thickness and shoot dry weight decreased and root-shoot ratio increased significantly with the increase of seed rate.”
t0“Rice”
Claim · model-written summary
BR3 had the highest shoot dry weight, followed by BRRI dhan50.
- Taxon
- RiceOryza sativat0
- Material
- BR3e0
- Outcome
- shoot dry weighte0
- Direction
- higheste0
- Comparator
- BRRI dhan50e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest shoot dry weight was observed in BR3 followed by BRRI dhan50.”
t0“Rice”
Claim · model-written summary
Seedling strength decreased as seed rate increased.
- Taxon
- RiceOryza sativat0
- Treatment
- seed ratee0
- Outcome
- Seedling strengthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedling strength also decreased with the increase of seed rate.”
t0“Rice”
Claim · model-written summary
BR3 at 100g seed rate had the highest seedling strength, 0.043 mg cm-1.
- Taxon
- RiceOryza sativat0
- Material
- BR3e0
- Treatment
- seed rate of 100ge0
- Outcome
- seedling strengthe0
- Direction
- higheste0
- Value
- 0.043 mg cm-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest seedling strength (0.043 mg cm-1) was observed for the seed rate of 100g of BR3 and the lowest (0.020 mg cm-1) for the seed rate of 160g of BRRI dhan28.”
t0“Rice”
Claim · model-written summary
BRRI dhan28 at 160g seed rate had the lowest seedling strength, 0.020 mg cm-1.
- Taxon
- RiceOryza sativat0
- Material
- BRRI dhan28e0
- Treatment
- seed rate of 160ge0
- Outcome
- seedling strengthe0
- Direction
- loweste0
- Value
- 0.020 mg cm-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest seedling strength (0.043 mg cm-1) was observed for the seed rate of 100g of BR3 and the lowest (0.020 mg cm-1) for the seed rate of 160g of BRRI dhan28.”
t0“Rice”
Claim · model-written summary
Higher seed rate and transplanter adjustment increased seedlings dispensed.
- Taxon
- RiceOryza sativat0
- Treatment
- seed rate and seedling adjustment optione0
- Outcome
- number of seedlinge0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of seedling increased and percentage of missing hills decreased with the increase of both the seed rate and seedling adjustment option of the rice transplanter irrespective of variety.”
t0“Rice”
Claim · model-written summary
Higher seed rate and transplanter adjustment decreased missing hills.
- Taxon
- RiceOryza sativat0
- Treatment
- seed rate and seedling adjustment optione0
- Outcome
- percentage of missing hillse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of seedling increased and percentage of missing hills decreased with the increase of both the seed rate and seedling adjustment option of the rice transplanter irrespective of variety.”
t0“Rice”
Claim · model-written summary
For BR3, seedlings dispensed per stroke ranged from 4.3 to 5.7 under the stated seed rates and adjustment options.
- Taxon
- RiceOryza sativat0
- Material
- BR3e0
- Outcome
- seedling dispensed per strokee0
- Value
- 4.3 to 5.7e0
- Qualifier
- seed rates of 140, 150 and 160 g of seeds tray-1 for 5 to 7 seedling adjustment optione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In case of BR3, seedling dispensed per stroke and percentage of missing hills varied from 4.3 to 5.7 and 6.8 to 7.8 for the seed rates of 140, 150 and 160 g of seeds tray-1 for 5 to 7 seedling adjustment option of the rice transplanter respectively.”
t0“Rice”
Claim · model-written summary
For BR3, missing hills ranged from 6.8 to 7.8 under the stated conditions.
- Taxon
- RiceOryza sativat0
- Material
- BR3e0
- Outcome
- percentage of missing hillse0
- Value
- 6.8 to 7.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In case of BR3, seedling dispensed per stroke and percentage of missing hills varied from 4.3 to 5.7 and 6.8 to 7.8 for the seed rates of 140, 150 and 160 g of seeds tray-1 for 5 to 7 seedling adjustment option of the rice transplanter respectively.”
t0“Rice”
Claim · model-written summary
For BRRI dhan28, seedlings per stroke were nearly the same across the stated seed rates and adjustment options.
- Taxon
- RiceOryza sativat0
- Material
- BRRI dhan28e0
- Outcome
- Seedlings per strokee0
- Direction
- almost samee0
- Value
- 4.2 to 6.3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings per stroke and percentage of missing hills of BRRI dhan28 for the seed rate of 130, 140 and 150 g of seeds tray-1 was found almost same for 5 to 7 seedling adjustment options of the rice transplanter (4.2 to 6.3 and 5.7 to 9.8).”
t0“Rice”
Claim · model-written summary
For BRRI dhan28, missing hills were nearly the same across the stated seed rates and adjustment options.
- Taxon
- RiceOryza sativat0
- Material
- BRRI dhan28e0
- Outcome
- percentage of missing hillse0
- Direction
- almost samee0
- Value
- 5.7 to 9.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings per stroke and percentage of missing hills of BRRI dhan28 for the seed rate of 130, 140 and 150 g of seeds tray-1 was found almost same for 5 to 7 seedling adjustment options of the rice transplanter (4.2 to 6.3 and 5.7 to 9.8).”
t0“Rice”
Claim · model-written summary
For BRRI dhan50, seedlings per stroke and missing hills differed minimally across the stated options.
- Taxon
- RiceOryza sativat0
- Material
- BRRI dhan50e0
- Outcome
- seedlings per stroke and percentage of missing hillse0
- Direction
- minimum differencee0
- Value
- 4.0 to 5.6 and 3.9 to 7.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, there was minimum difference of seedlings per stroke and percentage of missing hills among 120, 130 and 140 g of seeds tray-1 for the option of 4 to 7 (4.0 to 5.6 and 3.9 to 7.8 respectively) for BRRI dhan50.”
t0“Rice”
Claim · model-written summary
The authors recommend variety specific seed rates and adjustment options for quality seedlings and few missing hills.
- Taxon
- RiceOryza sativat0
- Outcome
- desired seedlings per hill and minimum missing hills along with good quality of seedlinge0
- Qualifier
- 140 g of seeds tray-1 for short and bold grain (BR3) and 130 g of seeds tray-1 for medium and slender grain (BRRI dhan28) under the seedling adjustment options of 5 to 7 and 120 g of seeds tray-1 for extra-long and slender grain (BRRI dhan50) under the seedling adjustment options of 4 to 7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It can be concluded that 140 g of seeds tray-1 for short and bold grain (BR3) and 130 g of seeds tray-1 for medium and slender grain (BRRI dhan28) under the seedling adjustment options of 5 to 7 and 120 g of seeds tray-1 for extra-long and slender grain (BRRI dhan50) under the seedling adjustment options of 4 to 7 may be used for desired seedlings per hill and minimum missing hills along with good quality of seedling.”
t0“Rice”
The same questions in other papers
density · growth · Oryza sativa (rice)Positive and negative results
22 papers in the same direction as this paper · 73 in the opposite direction
- positive
- positive
- positive
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See all 96 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.