Abstract
Variation in dry‐matter yield at second harvests was studied in a long‐term comparison of wheel traffic systems and soil compaction in grassland for silage in Scotland. Yields were obtained from compacted soil subjected to conventional traffic (C), from less compacted soil in a reduced ground‐pressure traffic system (R) and from non‐compacted soil in a zero‐traffic system (Z). Relationships between the ratios of second‐harvest yields, C 2 /Z 2 and C 2 /R 2 , and a number of soil, rainfall and crop parameters were tested by correlation analysis. The yield ratios increased significantly with the number of days after mowing before 2 mm of rain fell in 1 d ( r = 0·923*** and 0·715*, for C 2 /Z 2 and C 2 /R 2 respectively), and C 2 /Z 2 , but not C 2 /R 2 , decreased with increasing amount of rainfall in the 14 d after first mowing ( r = 0·787*). It was concluded that yield from compacted soil was greater than that from non‐compacted soil because the former depended less on rainfall in the weeks after first mowing. The degree of soil compaction in the reduced ground‐pressure traffic system, although maintaining first‐harvest yield benefit, reduced the risk of significantly diminished yield at second harvest in dry summers.
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Claims 6
Claim · model-written summary
The conventional-to-zero traffic yield ratio increased with delay to first substantial rain.
- Taxon
- perennial ryegrass
Lolium perennet0 - Outcome
- yield ratiose0
- Direction
- increasede0
- Value
- r = 0·923***e0
- Setting
- after mowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield ratios increased significantly with the number of days after mowing before 2 mm of rain fell in 1 d ( r = 0·923*** and 0·715*, for C 2 /Z 2 and C 2 /R 2 respectively)”
t0“perennial ryegrass”
Claim · model-written summary
The conventional-to-reduced pressure yield ratio increased with delay to first substantial rain.
- Taxon
- perennial ryegrassLolium perennet0
- Outcome
- yield ratiose0
- Direction
- increasede0
- Value
- 0·715*e0
- Setting
- after mowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield ratios increased significantly with the number of days after mowing before 2 mm of rain fell in 1 d ( r = 0·923*** and 0·715*, for C 2 /Z 2 and C 2 /R 2 respectively)”
t0“perennial ryegrass”
Claim · model-written summary
The conventional-to-zero traffic second-harvest yield ratio declined as rainfall after mowing increased.
- Taxon
- perennial ryegrassLolium perennet0
- Outcome
- C 2 /Z 2e0
- Direction
- decreasede0
- Value
- r = 0·787*e0
- Setting
- 14 d after first mowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“C 2 /Z 2 , but not C 2 /R 2 , decreased with increasing amount of rainfall in the 14 d after first mowing ( r = 0·787*)”
t0“perennial ryegrass”
Claim · model-written summary
The conventional-to-reduced pressure yield ratio was not reported to decrease with increasing rain.
- Taxon
- perennial ryegrassLolium perennet0
- Outcome
- C 2 /R 2e0
- Setting
- 14 d after first mowinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“C 2 /Z 2 , but not C 2 /R 2 , decreased with increasing amount of rainfall in the 14 d after first mowing”
t0“perennial ryegrass”
Claim · model-written summary
Compacted soil yielded more than noncompacted soil because its yield depended less on post-mowing rain.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- compacted soile0
- Outcome
- yielde0
- Direction
- greatere0
- Qualifier
- depended less on rainfalle0
- Comparator
- non‐compacted soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield from compacted soil was greater than that from non‐compacted soil because the former depended less on rainfall in the weeks after first mowing”
t0“perennial ryegrass”
Claim · model-written summary
Reduced ground-pressure traffic retained a first-harvest yield benefit and lowered second-harvest loss risk in dry summers.
- Taxon
- perennial ryegrassLolium perennet0
- Outcome
- risk of significantly diminished yield at second harveste0
- Direction
- reducede0
- Qualifier
- dry summerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The degree of soil compaction in the reduced ground‐pressure traffic system, although maintaining first‐harvest yield benefit, reduced the risk of significantly diminished yield at second harvest in dry summers”
t0“perennial ryegrass”