Abstract
The objective of this study was to determine the effect of water deficits during the reproductive period of an indeterminate soybean (Glycine max (L) Merr) crop on growth, seed yield and its components, and to establish whether the R 1 -R 4 or the R 4 -R 6.3 period was the most sensitive to drought. Group maturity III cultivar Asgrow 3127 was planted in the 1986—1987 and 1987-1988 growing seasons on a loamy soil (typic argiudol). The trial consisted of 3 deficiency treatments starting with 50% of soil-available water at the soil depth explored by the roots at the time of initiation, and with a control (II) constantly maintained at > 50% of soil available water. The treatment drought periods were: 0I) from R 1 to R 4 ; 10) from R 4 to R 6.3 ; and 00) from R 1 to R 4 and from R 4 to R 6.3 . Plots were individually irrigated and during the drought periods protected from rainfall with plastic covers. The control treatment (II) had greater dry matter production than 0I and 10, and these 2 treatments produced more dry matter than 00. Drought from R 1 to R 4 decreased leaf area production and drought from R 4 to R 6.3 accelerated leaf senescence. Leaf area index was related to percent solar radiation interception showing a critical LAI of = 5.5. Consequently, water deficits affected solar radia- tion interception. The reduction in PAR intercepted by the crop due to water deficits was no greater than 12%. The uti- lization efficiency of the intercepted PAR that ranged from 1.5-1.9 g per MJ was clearly affected by the drought. Drought during the first period affected the vegetative growth with little effect on seed yield. This effect was reflected on harvest index and on dry matter remobilization efficiency. On the other hand, the reduction in crop growth rate in- duced by drought during the R 4 -R 6.3 period was associated with important decreases in the number of reproductive structures per unit area as well as in total vegetative dry matter. The number of pods/ha was the yield component most affected by the treatments. For 0I, the number of seeds/pod and the weight of the seeds compensated the re- duction in number of pods, relative to the control. water deficit / Glycine mex (L) Merr / dry matter production / seed yield / yield component / harvest index / leaf water potential / leaf area index / interception of radiation Rsum — Dficit hydrique durant la phase reproductive du soja. I. Ses effets sur l'accumulation de la matire sche, le rendement en grain et ses composants. L'effet d'un dficit hydrique durant la phase reproductive du soja a t tudi pendant 2 ans dans une exprience en conditions contrles en plein champ. Les traite- ments ont consist en : II) un tmoin irrigu, et 3 priodes d'imposition de scheresse, savoir : 01) scheresse de R 1 R 4 ; 10) scheresse de R 4 R 6.3 ; et 00) scheresse de R 1 R 4 et de R 4 R 6.3 . Le tmoin irrigu produisit une moy- enne de 12 t de matire sche/ha et 5 t de grains/ha. Une scheresse impose de R 1 R 4 provoque une rduction de la surface foliaire et de la croissance vgtative, avec seulement un lger effet sur le rendement en grain. Au con- traire, une scheresse impose entre R 4 et R 6.3 diminue la production de matire sche vgtative et de graines. Le nombre de gousses/m 2 est la composante du rendement qui est la plus affecte par les traitements. En gnral, une augmentation du poids des graines compense dans le rendement la rduction du nombre de gousses.
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Claims 11
Claim · model-written summary
The irrigated control produced more dry matter than either single-period drought, and both exceeded two-period drought.
- Taxon
- soybean
Glycine maxt0 - Treatment
- 0I and 10e0
- Outcome
- dry matter productione0
- Direction
- greatere0
- Comparator
- control treatment (II)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The control treatment (II) had greater dry matter production than 0I and 10, and these 2 treatments produced more dry matter than 00”
t0“soybeans”
Claim · model-written summary
Early reproductive drought reduced leaf area production.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Drought from R 1 to R 4e0
- Outcome
- leaf area productione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought from R 1 to R 4 decreased leaf area production”
t0“soybeans”
Claim · model-written summary
Later reproductive drought accelerated leaf senescence.
- Taxon
- soybeanGlycine maxt0
- Treatment
- drought from R 4 to R 6.3e0
- Outcome
- leaf senescencee0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought from R 4 to R 6.3 accelerated leaf senescence”
t0“soybeans”
Claim · model-written summary
Leaf area index was related to solar radiation interception, with a critical LAI near 5.5.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- Leaf area indexe0
- Outcome
- percent solar radiation interceptione0
- Value
- 5.5e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area index was related to percent solar radiation interception showing a critical LAI of = 5.5”
t0“soybeans”
Claim · model-written summary
Water deficits reduced intercepted PAR by no more than 12%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- water deficitse0
- Outcome
- PAR intercepted by the crope0
- Direction
- reductione0
- Value
- 12%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in PAR intercepted by the crop due to water deficits was no greater than 12%”
t0“soybeans”
Claim · model-written summary
Drought affected intercepted PAR use efficiency, which ranged from 1.5 to 1.9 g per MJ.
- Taxon
- soybeanGlycine maxt0
- Treatment
- droughte0
- Outcome
- uti- lization efficiency of the intercepted PARe0
- Value
- 1.5-1.9 g per MJe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The uti- lization efficiency of the intercepted PAR that ranged from 1.5-1.9 g per MJ was clearly affected by the drought”
t0“soybeans”
Claim · model-written summary
Early reproductive drought reduced vegetative growth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Drought during the first periode0
- Outcome
- vegetative growthe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought during the first period affected the vegetative growth with little effect on seed yield”
t0“soybeans”
Claim · model-written summary
Early reproductive drought had little effect on seed yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Drought during the first periode0
- Outcome
- seed yielde0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought during the first period affected the vegetative growth with little effect on seed yield”
t0“soybeans”
Claim · model-written summary
Later drought reduced crop growth rate and was associated with fewer reproductive structures and less vegetative dry matter.
- Taxon
- soybeanGlycine maxt0
- Treatment
- drought during the R 4 -R 6.3 periode0
- Outcome
- number of reproductive structures per unit areae0
- Direction
- decreasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction in crop growth rate in- duced by drought during the R 4 -R 6.3 period was associated with important decreases in the number of reproductive structures per unit area as well as in total vegetative dry matter”
t0“soybeans”
Claim · model-written summary
Pod number was the yield component most affected by drought treatments.
- Taxon
- soybeanGlycine maxt0
- Outcome
- number of pods/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of pods/ha was the yield component most affected by the treatments”
t0“soybeans”
Claim · model-written summary
Seed number per pod and seed weight compensated for fewer pods under early drought.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 0Ie0
- Outcome
- number of seeds/pod and the weight of the seedse0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For 0I, the number of seeds/pod and the weight of the seeds compensated the re- duction in number of pods, relative to the control”
t0“soybeans”
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See all 214 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.