Abstract
Abstract Tillage‐induced pans in many Atlantic Coastal Plain soils restrict soybean ( Glycine max L. Merr.) rooting. Consequently, one or more drought periods may reduce soybean yields. This study determined tillage and irrigation effects on soybean yields in one of these soils in a dry year. ‘Ransom’ soybeans were planted on 19 May 1977 on Wagram loamy sand (Arenic Paleudult) which has a traffic induced pan at 25 cm. One half of each plot was conventionally tilled (moldboard plus three diskings); the other half was subsoiled to 45 cm and bedded. The date at which irrigation began was considered the whole plot and was replicated four times in a randomized block design. Irrigations were scheduled using tensiometers whenever the soil moisture tension in the 15 to 30‐cm depth reached 0.8 bars. A gradient with respect to the amount of water applied was established across each plot; no irrigation water reached the far side of the plots. Dates at which irrigation began were 23 June (early), 29 July (after flowering began), and 1 September (after pod set started). Once irrigation was initiated, each treatment was irrigated as needed throughout the growing season. Yields of conventionally tilled soybeans were 1,728, 2,063, 2,124, and 1,686 kg/ha for no irrigation and for full irrigation initiated on 23 June, 29 July, and 29 September, respectively. No significant yield increase or decrease was observed for the irrigated, subsoiled plots, regardless of the date irrigation began. Average yield of the subsoiled treatment was 37% higber than the 1,802 kg/ha overall average yield for conventionally tilled soybeans. The fact that the irrigated, conventionally tilled treatments did not achieve yields equal to those of the nonirrigated, subsoiled treatment suggest that some other benefit(s) accrue from the subsoil and bedding operation in addition to increasing water availability.
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Claims 7
Claim · model-written summary
Without irrigation, conventionally tilled soybean yielded 1,728 kg/ha.
- Taxon
- soybeans
Glycine maxe0 - Treatment
- no irrigatione0
- Outcome
- Yieldse0
- Value
- 1,728e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of conventionally tilled soybeans were 1,728, 2,063, 2,124, and 1,686 kg/ha for no irrigation and for full irrigation initiated on 23 June, 29 July, and 29 September, respectively.”
Claim · model-written summary
Conventional tillage with irrigation begun 23 June yielded 2,063 kg/ha.
- Taxon
- soybeansGlycine maxe0
- Treatment
- full irrigation initiated on 23 Junee0
- Outcome
- Yieldse0
- Value
- 2,063e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of conventionally tilled soybeans were 1,728, 2,063, 2,124, and 1,686 kg/ha for no irrigation and for full irrigation initiated on 23 June, 29 July, and 29 September, respectively.”
Claim · model-written summary
Conventional tillage with irrigation begun 29 July yielded 2,124 kg/ha.
- Taxon
- soybeansGlycine maxe0
- Treatment
- 29 Julye0
- Outcome
- Yieldse0
- Value
- 2,124e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of conventionally tilled soybeans were 1,728, 2,063, 2,124, and 1,686 kg/ha for no irrigation and for full irrigation initiated on 23 June, 29 July, and 29 September, respectively.”
Claim · model-written summary
Conventional tillage with irrigation begun 29 September yielded 1,686 kg/ha.
- Taxon
- soybeansGlycine maxe0
- Treatment
- 29 Septembere0
- Outcome
- Yieldse0
- Value
- 1,686e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of conventionally tilled soybeans were 1,728, 2,063, 2,124, and 1,686 kg/ha for no irrigation and for full irrigation initiated on 23 June, 29 July, and 29 September, respectively.”
Claim · model-written summary
Irrigation did not significantly change yields in subsoiled plots.
- Taxon
- soybeanGlycine maxt0
- Treatment
- irrigated, subsoiled plotse0
- Outcome
- yielde0
- Direction
- No significant yield increase or decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant yield increase or decrease was observed for the irrigated, subsoiled plots, regardless of the date irrigation began.”
t0“Soybean”
Claim · model-written summary
Subsoiling raised mean yield 37% over conventional tillage.
- Taxon
- soybeansGlycine maxe0
- Treatment
- subsoiled treatmente0
- Outcome
- Average yielde0
- Direction
- higbere0
- Value
- 37%e0
- Qualifier
- 1,802 kg/hae0
- Comparator
- conventionally tilled soybeanse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average yield of the subsoiled treatment was 37% higber than the 1,802 kg/ha overall average yield for conventionally tilled soybeans.”
Claim · model-written summary
Authors infer benefits of subsoiling and bedding beyond water availability.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- subsoil and bedding operatione0
- Outcome
- benefit(s)e0
- Qualifier
- in addition to increasing water availabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some other benefit(s) accrue from the subsoil and bedding operation in addition to increasing water availability”
t0“Soybean”
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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.