Abstract
There is increasing use of Italian ryegrass ( Lolium multiflorum Lam.) as a green manure in potato ( Solanum tuberosum L.) rotations; however, effects of its management on soil N supply to the subsequent potato crop are unknown. Fertilizer N management and plow‐down date for a preceding Italian ryegrass crop, ‘Lemtal’, on soil N supply to a subsequent potato crop, ‘Russet Burbank’, was determined over 2 yr. Application of N at 150 to 188 kg N ha −1 to ryegrass increased dry matter yield and N uptake of aboveground forage and stubble (i.e., stubble, crown, and large root) tissue. Delaying plow‐down from early September to early November increased dry matter yield and N uptake of stubble tissue, but not aboveground forage. Apparent recovery of applied N in harvested forage and stubble tissue averaged 55 and 12%, respectively. High N application to the ryegrass increased soil N supply to the subsequent unfertilized potato crop as indicated by increased tuber yield, mean tuber weight, and plant (i.e., vines plus tubers) dry matter yield and N uptake. However, the increase in soil N supply (i.e., N uptake of unfertilized potato plants at vine desiccation) was small (<20 kg N ha −1 ). Apparent recovery of N applied to the ryegrass crop in unfertilized potato plants was low (10%). Delayed ryegrass plow‐down had no effect on soil N supply to the subsequent potato crop. Italian ryegrass green manure crop can be effective in increasing soil organic matter inputs but has limited short‐term effects on soil N supply for potato.
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Claims 10
Claim · model-written summary
Nitrogen application increased ryegrass forage and stubble dry matter yield and nitrogen uptake.
- Treatment
- Application of N at 150 to 188 kg N ha −1e0
- Outcome
- dry matter yield and N uptake of aboveground forage and stubblee0
- Direction
- increasede0
LoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of N at 150 to 188 kg N ha −1 to ryegrass increased dry matter yield and N uptake of aboveground forage and stubble (i.e., stubble, crown, and large root) tissue.”
Claim · model-written summary
Delaying plow-down increased stubble dry matter yield and nitrogen uptake.
- Treatment
- Delaying plow‐down from early September to early Novembere0
- Outcome
- dry matter yield and N uptake of stubble tissuee0
- Direction
- increasede0
- Comparator
- early Septembere0
Not reportedTaxon
Verbatim
e0“Delaying plow‐down from early September to early November increased dry matter yield and N uptake of stubble tissue, but not aboveground forage.”
Claim · model-written summary
Delayed plow-down did not increase aboveground forage yield or nitrogen uptake.
- Treatment
- Delaying plow‐down from early September to early Novembere0
- Outcome
- aboveground foragee0
- Direction
- not aboveground foragee0
- Comparator
- early Septembere0
Not reportedTaxon
Verbatim
e0“Delaying plow‐down from early September to early November increased dry matter yield and N uptake of stubble tissue, but not aboveground forage.”
Claim · model-written summary
Apparent nitrogen recovery averaged 55% in harvested forage.
Not reportedTaxon
Verbatim
e0“Apparent recovery of applied N in harvested forage and stubble tissue averaged 55 and 12%, respectively.”
Claim · model-written summary
Apparent nitrogen recovery averaged 12% in stubble.
Not reportedTaxon
Verbatim
e0“Apparent recovery of applied N in harvested forage and stubble tissue averaged 55 and 12%, respectively.”
Claim · model-written summary
High ryegrass nitrogen application increased subsequent unfertilized potato tuber yield, mean tuber weight, plant dry matter yield and nitrogen uptake.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- High N application to the ryegrasse0
- Outcome
- tuber yield, mean tuber weight, and plant (i.e., vines plus tubers) dry matter yield and N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High N application to the ryegrass increased soil N supply to the subsequent unfertilized potato crop as indicated by increased tuber yield, mean tuber weight, and plant (i.e., vines plus tubers) dry matter yield and N uptake.”
Claim · model-written summary
The increase in nitrogen supply to unfertilized potato plants was below 20 kg N per hectare.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- N uptake of unfertilized potato plants at vine desiccatione0
- Value
- <20 kg N ha −1e0
- Qualifier
- smalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase in soil N supply (i.e., N uptake of unfertilized potato plants at vine desiccation) was small (<20 kg N ha −1 )”
Claim · model-written summary
Unfertilized potato plants recovered 10% of nitrogen applied to the ryegrass crop.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- Apparent recovery of N applied to the ryegrass crop in unfertilized potato plantse0
- Value
- 10%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apparent recovery of N applied to the ryegrass crop in unfertilized potato plants was low (10%).”
Claim · model-written summary
Delayed ryegrass plow-down had no effect on nitrogen supply to the subsequent potato crop.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Delayed ryegrass plow‐downe0
- Outcome
- soil N supply to the subsequent potato crope0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delayed ryegrass plow‐down had no effect on soil N supply to the subsequent potato crop.”
Claim · model-written summary
Ryegrass green manure increased soil organic matter inputs but had limited short-term effects on potato nitrogen supply.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- soil organic matter inputse0
- Qualifier
- limited short‐term effects on soil N supply for potatoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Italian ryegrass green manure crop can be effective in increasing soil organic matter inputs but has limited short‐term effects on soil N supply for potato.”
The same questions in other papers
nitrogen · yield · Solanum tuberosum (potato)Results differ
108 papers in the same direction as this paper · 20 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- negative
- negative
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See all 132 papers →nitrogen · yield · LoliumPositive and negative results
41 papers in the same direction as this paper · 10 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- negative
- no effect
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See all 54 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.