Abstract
Abstract An experiment was carried out under laboratory conditions to find out the critical bulk density and seed placement depths for upland rice seedling emergence. Aluminum cylinders were used to accomplish various combinations of bulk densities and depths of seed placement by compacting soil at moisture content of 9%. Seedling emergences was observed till the 10th day after sowing in a constant temperature incubator of 35 C. Depths down to 8 cm with 1.6 g/cc or 0.7hg/cm 2 pressures and lower densities and pressures were not limiting for seedling emergence when moisture was above field capacity. Depths beyond 8 cm with these densities and below 5 cm with 1.7 and 1.8 g/cc bulk densities seem to be limiting. The pressure of 2.8hg/cm 2 at 10 cm depth became so critical that the emergence ceased totally. It seems that the mechanical impedance or the increased soil strength with increasing bulk densities affected seedling emergence adversely.
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Claims 5
Claim · model-written summary
At 1.6 g/cc bulk density and depths down to 8 cm, lower densities and pressures did not limit seedling emergence when moisture was above field capacity.
- Taxon
- upland rice
Oryza sativat0 - Treatment
- 1.6 g/cce1
- Outcome
- seedling emergencee1
- Direction
- not limitinge1
- Value
- 8 cme1
- Qualifier
- when moisture was above field capacitye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of Bulk Density and Seed Placement on Upland Rice Seedling Emergence”
e1“Depths down to 8 cm with 1.6 g/cc or 0.7hg/cm 2 pressures and lower densities and pressures were not limiting for seedling emergence when moisture was above field capacity”
Claim · model-written summary
Seed placement depths beyond 8 cm seem to limit seedling emergence at these bulk densities.
- Taxon
- upland riceOryza sativat0
- Treatment
- Depths beyond 8 cme2
- Outcome
- seedling emergencee1
- Direction
- limitinge2
- Qualifier
- with these densitiese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of Bulk Density and Seed Placement on Upland Rice Seedling Emergence”
e1“Depths down to 8 cm with 1.6 g/cc or 0.7hg/cm 2 pressures and lower densities and pressures were not limiting for seedling emergence when moisture was above field capacity”
e2“Depths beyond 8 cm with these densities and below 5 cm with 1.7 and 1.8 g/cc bulk densities seem to be limiting”
Claim · model-written summary
Seed placement below 5 cm seems to limit seedling emergence at 1.7 and 1.8 g/cc bulk densities.
- Taxon
- upland riceOryza sativat0
- Treatment
- below 5 cme2
- Outcome
- seedling emergencee1
- Direction
- limitinge2
- Qualifier
- 1.7 and 1.8 g/cc bulk densitiese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of Bulk Density and Seed Placement on Upland Rice Seedling Emergence”
e1“Depths down to 8 cm with 1.6 g/cc or 0.7hg/cm 2 pressures and lower densities and pressures were not limiting for seedling emergence when moisture was above field capacity”
e2“Depths beyond 8 cm with these densities and below 5 cm with 1.7 and 1.8 g/cc bulk densities seem to be limiting”
Claim · model-written summary
A pressure of 2.8 hg/cm2 at 10 cm depth stopped seedling emergence completely.
- Taxon
- upland riceOryza sativat0
- Treatment
- pressure of 2.8hg/cm 2 at 10 cm depthe3
- Outcome
- emergencee3
- Direction
- ceased totallye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of Bulk Density and Seed Placement on Upland Rice Seedling Emergence”
e3“The pressure of 2.8hg/cm 2 at 10 cm depth became so critical that the emergence ceased totally”
Claim · model-written summary
Mechanical impedance or increased soil strength with rising bulk density is proposed to reduce seedling emergence.
- Taxon
- upland riceOryza sativat0
- Outcome
- seedling emergencee4
- Qualifier
- mechanical impedance or the increased soil strength with increasing bulk densitiese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of Bulk Density and Seed Placement on Upland Rice Seedling Emergence”
e4“It seems that the mechanical impedance or the increased soil strength with increasing bulk densities affected seedling emergence adversely”