Abstract
Abstract It has been postulated that water regime was the major operative factor responsible for different yield response of dryland grain sorghum [ Sorghum bicolor (L.) Moench] to different planting dates. Our research was done in order to appraise this postulation. For four consecutive years, four grain sorghum hybrids were planted on two planting dates (March 20–24 and April 12–16) in Israel under conditions of limited water supply as determined by the amount of stored soil moisture prior to planting. Vegetative development, grain yield, and soil water extraction profiles were determined. Early planting, as compared with late planting, increased grain yield through increased tillering and greater weight per grain. During the period from emergence to 51 days, early planted sorghum used about half as much water as late‐planted sorghum. Early planted sorghum was less water stressed, as evidenced by lower leaf diffusive resistance prior to heading and smaller reduction in LAI (leaf desiccation) after heading, as compared with late‐planted sorghum. Lower water use in early planted sorghum, during the period prior to heading, was ascribed to lower potential evapotranspiration, smaller LAI, and possibly slower root development, as compared with the respective period in late‐planted sorghum. Total amount of water used at maturity did not differ between planting dates, apparently due to the longer period of growth and the larger amount of stover dry matter per plant in early planted sorghum, which served to offset the decreased water use during the earlier phase of growth. No appreciable differences were found between hybrids tested in terms of adaption to early planting or water use.
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Claims 9
Claim · model-written summary
Early planting increased grain yield through tillering and grain weight.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early planting, as compared with late planting, increased grain yield through increased tillering and greater weight per grain.”
t0“Sorghum”
Claim · model-written summary
Early planting increased tillering.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early planting, as compared with late planting, increased grain yield through increased tillering and greater weight per grain.”
t0“Sorghum”
Claim · model-written summary
Early planting increased weight per grain.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early planting, as compared with late planting, increased grain yield through increased tillering and greater weight per grain.”
t0“Sorghum”
Claim · model-written summary
Early planted sorghum used about half as much water from emergence to day 51.
- Treatment
- early plantede0
- Outcome
- watere0
- Direction
- half as muche0
- Value
- half as muche0
- Qualifier
- emergence to 51 dayse0
- Comparator
- late‐plantede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the period from emergence to 51 days, early planted sorghum used about half as much water as late‐planted sorghum.”
Claim · model-written summary
Early planted sorghum had lower leaf diffusive resistance before heading.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early planted sorghum was less water stressed, as evidenced by lower leaf diffusive resistance prior to heading and smaller reduction in LAI (leaf desiccation) after heading, as compared with late‐planted sorghum.”
Claim · model-written summary
Early planted sorghum had a smaller reduction in LAI after heading.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early planted sorghum was less water stressed, as evidenced by lower leaf diffusive resistance prior to heading and smaller reduction in LAI (leaf desiccation) after heading, as compared with late‐planted sorghum.”
Claim · model-written summary
Early planting reduced water use before heading, attributed to lower potential evapotranspiration, smaller LAI, and possibly slower root development.
- Treatment
- early plantede0
- Outcome
- Lower water usee0
- Qualifier
- lower potential evapotranspiration, smaller LAI, and possibly slower root developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower water use in early planted sorghum, during the period prior to heading, was ascribed to lower potential evapotranspiration, smaller LAI, and possibly slower root development, as compared with the respective period in late‐planted sorghum.”
Claim · model-written summary
Total water use at maturity did not differ by planting date.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total amount of water used at maturity did not differ between planting dates, apparently due to the longer period of growth and the larger amount of stover dry matter per plant in early planted sorghum”
Claim · model-written summary
The tested sorghum hybrids showed no appreciable difference in adaptation to early planting or water use.
- Material
- hybrids testede0
- Outcome
- adaption to early planting or water usee0
- Direction
- No appreciable differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No appreciable differences were found between hybrids tested in terms of adaption to early planting or water use.”
t0“Sorghum”
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