Abstract
The objectives of this experiment were to determine the chloroplast pigments dynamics of soybean leaves during the growth stages under different tillage systems, which can be a major factor limiting yield of soybean. The greatest differences between the photosynthetic productivity parameters of the investigated soybean were determined from reproductive stages (R2 and R3 – 4). The chlorophyll a, chlorophyll a/b and carotenoids content under CT, DH and NT were greater in the reproductive stages (R2 and R3 – 4) than in the early stages (V3 – 4 and R1). The concentration dynamics of chlorophyll b and chlorophyll a/b was very similar in all growth stages and under all tillage systems in the 2-yr average. The increased drought stress in 2003 was likely critical in the observed lower seed yields in 2003. The yield of soybean was significantly lower under NT than CT and DH treatments in both years. The relationship between the soybean yield and chloroplast pigments concentration is strongly influenced by external factors. In the 2-yr average the soybean yield was considerably affected by the years and tillage systems. Statistical analysis showed a very significant relationship between chlorophyll pigments content, but photosynthetic parameters investigated did not correlate with soybean yield.
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Claims 8
Claim · model-written summary
Photosynthetic productivity parameters differed most in reproductive stages.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- reproductive stages (R2 and R3 – 4)e0
- Outcome
- photosynthetic productivity parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greatest differences between the photosynthetic productivity parameters of the investigated soybean were determined from reproductive stages (R2 and R3 – 4).”
Claim · model-written summary
Chlorophyll a, chlorophyll a/b and carotenoids were greater in reproductive than early stages across tillage systems.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- reproductive stages (R2 and R3 – 4)e0
- Outcome
- chlorophyll a, chlorophyll a/b and carotenoids contente0
- Direction
- greatere0
- Comparator
- early stages (V3 – 4 and R1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll a, chlorophyll a/b and carotenoids content under CT, DH and NT were greater in the reproductive stages (R2 and R3 – 4) than in the early stages (V3 – 4 and R1).”
t0“soybean”
Claim · model-written summary
Chlorophyll b and chlorophyll a/b concentration dynamics were similar across growth stages and tillage systems.
- Taxon
- soybeanGlycine maxt0
- Outcome
- concentration dynamics of chlorophyll b and chlorophyll a/be0
- Qualifier
- in all growth stages and under all tillage systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentration dynamics of chlorophyll b and chlorophyll a/b was very similar in all growth stages and under all tillage systems in the 2-yr average.”
t0“soybean”
Claim · model-written summary
Drought stress was likely critical to lower seed yields in 2003.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increased drought stresse0
- Outcome
- seed yieldse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increased drought stress in 2003 was likely critical in the observed lower seed yields in 2003.”
t0“soybean”
Claim · model-written summary
No-till soybean yield was significantly lower than under CT and DH in both years.
- Taxon
- soybeanGlycine maxe0
- Treatment
- NTe0
- Outcome
- yielde0
- Direction
- lowere0
- Comparator
- CT and DH treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of soybean was significantly lower under NT than CT and DH treatments in both years.”
Claim · model-written summary
Year and tillage system considerably affected soybean yield.
- Taxon
- soybeanGlycine maxe0
- Treatment
- tillage systemse0
- Outcome
- soybean yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the 2-yr average the soybean yield was considerably affected by the years and tillage systems.”
Claim · model-written summary
Chlorophyll pigment contents had a very significant relationship.
- Taxon
- soybeanGlycine maxt0
- Outcome
- chlorophyll pigments contente0
Not reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistical analysis showed a very significant relationship between chlorophyll pigments content”
t0“soybean”
Claim · model-written summary
The photosynthetic parameters did not correlate with soybean yield.
- Taxon
- soybeanGlycine maxe0
- Outcome
- soybean yielde0
- Direction
- did not correlatee0
- Qualifier
- photosynthetic parameterse0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthetic parameters investigated did not correlate with soybean yield.”
The same questions in other papers
tillage · yield · Glycine max (soybean)Positive and negative results
125 papers in the same direction as this paper · 264 in the opposite direction
- positive
- no effect
- positive
386 papers more in this group
See all 390 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.