Abstract
Loss of foliage in soybean crop through leaf eating insects and diseases is common in tropical and sub-tropical countries where farmers do not protect their crops adequately. Experiment was performed under sub-tropical condition (24°8' N, 90°0' E) with four levels of defoliations (0, 25, 50 and 75% from base of the canopy). Defoliations were imposed at the visible bud initiation stage to investigate the growth and yield attributes in two popular soybean varieties during January to April 2011. Results revealed that degrees of defoliations simultaneously decreased leaf area and total dry matter (TDM) production irrespective of varieties. Defoliation not only reduced source sizes but also decreased total sink (pod) production resulting in lower seed yields. However, basal 25% defoliation did not decrease TDM, seed weight/plant and seed yield/ha significantly indicating the fact that the soybean plant, in general, can tolerate 25% basal leaf loss of the canopy. Exceeding this threshold limit (>25%) of the canopy defoliation reduced TDM and seed yield significantly. Implication of the results in relation to pest management was also discussed.
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Claims 10
Claim · model-written summary
Increasing defoliation reduced leaf area regardless of variety.
- Taxon
- soybean
Glycine maxt0 - Treatment
- degrees of defoliationse0
- Outcome
- leaf areae0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“degrees of defoliations simultaneously decreased leaf area and total dry matter (TDM) production irrespective of varieties.”
t0“soybean”
Claim · model-written summary
Increasing defoliation reduced total dry matter regardless of variety.
- Taxon
- soybeanGlycine maxt0
- Treatment
- degrees of defoliationse0
- Outcome
- total dry matter (TDM) productione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“degrees of defoliations simultaneously decreased leaf area and total dry matter (TDM) production irrespective of varieties.”
t0“soybean”
Claim · model-written summary
Defoliation reduced source size.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Defoliatione0
- Outcome
- source sizese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation not only reduced source sizes but also decreased total sink (pod) production resulting in lower seed yields.”
t0“soybean”
Claim · model-written summary
Defoliation reduced pod production.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Defoliatione0
- Outcome
- total sink (pod) productione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation not only reduced source sizes but also decreased total sink (pod) production resulting in lower seed yields.”
t0“soybean”
Claim · model-written summary
Defoliation lowered seed yields.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Defoliatione0
- Outcome
- seed yieldse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation not only reduced source sizes but also decreased total sink (pod) production resulting in lower seed yields.”
t0“soybean”
Claim · model-written summary
Basal 25% defoliation did not significantly lower dry matter.
- Taxon
- soybeanGlycine maxt0
- Treatment
- basal 25% defoliatione0
- Outcome
- TDMe0
- Direction
- did not decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“basal 25% defoliation did not decrease TDM, seed weight/plant and seed yield/ha significantly”
t0“soybean”
Claim · model-written summary
Basal 25% defoliation did not significantly lower seed weight per plant.
- Taxon
- soybeanGlycine maxt0
- Treatment
- basal 25% defoliatione0
- Outcome
- seed weight/plante0
- Direction
- did not decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“basal 25% defoliation did not decrease TDM, seed weight/plant and seed yield/ha significantly”
t0“soybean”
Claim · model-written summary
Basal 25% defoliation did not significantly lower seed yield per hectare.
- Taxon
- soybeanGlycine maxt0
- Treatment
- basal 25% defoliatione0
- Outcome
- seed yield/hae0
- Direction
- did not decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“basal 25% defoliation did not decrease TDM, seed weight/plant and seed yield/ha significantly”
t0“soybean”
Claim · model-written summary
Defoliation above 25% significantly reduced dry matter.
- Taxon
- soybeanGlycine maxt0
- Treatment
- >25%e0
- Outcome
- TDMe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exceeding this threshold limit (>25%) of the canopy defoliation reduced TDM and seed yield significantly.”
t0“soybean”
Claim · model-written summary
Defoliation above 25% significantly reduced seed yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- >25%e0
- Outcome
- seed yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exceeding this threshold limit (>25%) of the canopy defoliation reduced TDM and seed yield significantly.”
t0“soybean”
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