Abstract
Abstract Lentil ( Lens culinaris Med.) is largely sown by hand broadcasting at around 400 seeds m −2 in West Asia. Rising labor costs for hand harvest are forcing farmers to consider machine harvesting, which is economically feasible only on mechanically drilled, flat seedbeds. Seeding experiments were conducted at three sites between 1979 and 1986 to determine the effect of seeding densities (100–400 seeds m −2 ) and row spacing (0.2,0.3,0.4, and 0.5 m) on the seed yield, biological yield and economic return of rainfed lentil. The main site, Tel Hadya (Syria) had a mean annual rainfall of 315 mm over five seasons; Terbol (Lebanon) was wetter with 520 mm over two seasons; and Breda (Syria) was drier with 244 mm over two seasons. Seed yield and total biological yield were greater at the two wetter sites, but yields were significantly affected by seeding density within each site. The relationship between yield and seed density was best described by a quadratic curve. At the wetter sites (Tel Hadya and Terbol), seeding densities for maximum seed yield were 267 ± 33 seeds m −2 , considerably lower than the 334 ± 4 at the drier Breda site. for maximum total biological yield, the seeding densities were 276 ? 22 for Tel Hadya, 298 ± 16 for Terbol, and 346 ± 4 seeds m −2 for Breda. The results indicated that using a seed drill, the optimum density for gross economic return minus seed cost was 280 seeds m − at Tel Hadya and Terbol and 320 seeds m −2 at Breda. These rates represent a potential saving in seed costs of 20 to 30% over hand broadcasting. Yields were less responsive to row spacing than to seeding density. Narrowest row spacing (0.2 m) generally gave the greatest seed yields, which decreased linearly with increased row spacing.
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Claims 14
Claim · model-written summary
Seed and biological yields were greater at wetter sites.
- Taxon
- Lentil
Lens culinarist0 - Outcome
- Seed yield and total biological yielde0
- Direction
- greatere0
- Setting
- the two wetter sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield and total biological yield were greater at the two wetter sites”
t0“Lentil”
Claim · model-written summary
Seeding density significantly affected yield at each site.
- Taxon
- LentilLens culinarist0
- Treatment
- seeding densitye0
- Outcome
- yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yields were significantly affected by seeding density within each site”
t0“Lentil”
Claim · model-written summary
A quadratic curve best described the yield and seed density relationship.
- Taxon
- LentilLens culinarist0
- Outcome
- relationship between yield and seed densitye0
- Value
- quadratic curvee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between yield and seed density was best described by a quadratic curve.”
t0“Lentil”
Claim · model-written summary
The maximum seed yield density at wetter sites was 267 ± 33 seeds per square meter.
- Taxon
- LentilLens culinarist0
- Outcome
- seeding densities for maximum seed yielde0
- Value
- 267 ± 33 seeds m −2e0
- Setting
- Tel Hadya and Terbole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the wetter sites (Tel Hadya and Terbol), seeding densities for maximum seed yield were 267 ± 33 seeds m −2”
t0“Lentil”
Claim · model-written summary
The maximum seed yield density at Breda was 334 ± 4 seeds per square meter.
- Taxon
- LentilLens culinarist0
- Outcome
- 334 ± 4e0
- Value
- 334 ± 4e0
- Setting
- Bredae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“considerably lower than the 334 ± 4 at the drier Breda site”
t0“Lentil”
Claim · model-written summary
The density for maximum biological yield at Tel Hadya was 276 ? 22.
- Taxon
- LentilLens culinarist0
- Outcome
- seeding densitiese0
- Value
- 276 ? 22e0
- Setting
- Tel Hadyae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeding densities were 276 ? 22 for Tel Hadya”
t0“Lentil”
Claim · model-written summary
The density for maximum biological yield at Terbol was 298 ± 16.
- Taxon
- LentilLens culinarist0
- Outcome
- 298 ± 16e0
- Value
- 298 ± 16e0
- Setting
- Terbole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“298 ± 16 for Terbol”
t0“Lentil”
Claim · model-written summary
The density for maximum biological yield at Breda was 346 ± 4 seeds per square meter.
- Taxon
- LentilLens culinarist0
- Outcome
- 346 ± 4 seeds m −2e0
- Value
- 346 ± 4 seeds m −2e0
- Setting
- Bredae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“346 ± 4 seeds m −2 for Breda”
t0“Lentil”
Claim · model-written summary
The optimum density for gross return less seed cost was 280 at Tel Hadya and Terbol.
- Taxon
- LentilLens culinarist0
- Outcome
- gross economic return minus seed coste0
- Value
- 280 seeds m −e0
- Setting
- Tel Hadya and Terbole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“optimum density for gross economic return minus seed cost was 280 seeds m − at Tel Hadya and Terbol”
t0“Lentil”
Claim · model-written summary
The optimum density for gross return less seed cost was 320 at Breda.
- Taxon
- LentilLens culinarist0
- Outcome
- 320 seeds m −2e0
- Value
- 320 seeds m −2e0
- Setting
- Bredae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“320 seeds m −2 at Breda”
t0“Lentil”
Claim · model-written summary
The optimum drilled densities could save 20 to 30% of seed costs over broadcasting.
- Taxon
- LentilLens culinarist0
- Treatment
- These ratese0
- Outcome
- seed costse0
- Direction
- savinge0
- Value
- 20 to 30%e0
- Comparator
- hand broadcastinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These rates represent a potential saving in seed costs of 20 to 30% over hand broadcasting.”
t0“Lentil”
Claim · model-written summary
Yields responded less to row spacing than seeding density.
- Taxon
- LentilLens culinarist0
- Treatment
- row spacinge0
- Outcome
- Yieldse0
- Direction
- less responsivee0
- Comparator
- seeding densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were less responsive to row spacing than to seeding density.”
t0“Lentil”
Claim · model-written summary
The narrowest row spacing generally gave the greatest seed yields.
- Taxon
- LentilLens culinarist0
- Treatment
- Narrowest row spacing (0.2 m)e0
- Outcome
- seed yieldse0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Narrowest row spacing (0.2 m) generally gave the greatest seed yields”
t0“Lentil”
Claim · model-written summary
Seed yields declined linearly as row spacing increased.
- Taxon
- LentilLens culinarist0
- Treatment
- row spacinge0
- Outcome
- seed yieldse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed yields, which decreased linearly with increased row spacing”
t0“Lentil”
The same questions in other papers
density · yield · Lens culinaris (lentil)Positive and negative results
22 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- no effect
24 papers more in this group
See all 28 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.