Abstract
The productivity levels of two arenosol (Ar40) and fluvisol (FL40) fields that had been cultivated for over 40 years were compared to that of fields with the same soils located nearby but never previously cultivated, i.e. Ar0 and FL0, respectively. Application of poultry manure (PM) and sewage sludge (SS) were compared to a mineral fertilizer (T100), corresponding to 100 kg/ha of nitrogen, over three lettuce (Lactuca sativa L.) crop cycles. PM and SS were applied at 50 and 150 kg/ha nitrogen equivalent fertilizer doses. Biomass production levels in the organic and mineral treatments were similar, except for the SS-50 for FL0 and the PM-150 for Ar40, FL40 and FL0. Biomass production levels of Ar40 were higher than those of Ar0 for the first cycle. In the initial state, the soil P content in Ar40 was higher than that of the Ar0 soil. With the treatment repetition, Ar0 showed the same production level as Ar40. For the fluvisols, biomass production levels of FL40 were lower than those of FL0 for the first cycle. Indeed, the initial nitrate content in FL40 was lower than in FL0. The biomass production levels of FL40 were higher than those of FL0 for the following cycles.
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Claims 7
Claim · model-written summary
Organic and mineral treatments had similar lettuce biomass, with specified exceptions.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- organice0
- Outcome
- Biomass production levelse0
- Direction
- similare0
- Qualifier
- except for the SS-50 for FL0 and the PM-150 for Ar40, FL40 and FL0e0
- Comparator
- mineral treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biomass production levels in the organic and mineral treatments were similar, except for the SS-50 for FL0 and the PM-150 for Ar40, FL40 and FL0.”
t0“lettuce”
Claim · model-written summary
Ar40 lettuce biomass exceeded Ar0 in the first cycle.
- Taxon
- lettuceLactuca sativat0
- Outcome
- Biomass production levelse0
- Direction
- highere0
- Qualifier
- first cyclee0
- Comparator
- Ar0e0
- Setting
- Ar40e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biomass production levels of Ar40 were higher than those of Ar0 for the first cycle.”
t0“lettuce”
Claim · model-written summary
Initial soil P content was higher in Ar40 than Ar0.
Not reportedTaxon
Verbatim
e0“In the initial state, the soil P content in Ar40 was higher than that of the Ar0 soil.”
Claim · model-written summary
Repeated treatment brought Ar0 lettuce production to the same level as Ar40.
- Taxon
- lettuceLactuca sativat0
- Treatment
- treatment repetitione0
- Outcome
- production levele0
- Direction
- samee0
- Comparator
- Ar40e0
- Setting
- Ar0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the treatment repetition, Ar0 showed the same production level as Ar40.”
t0“lettuce”
Claim · model-written summary
FL40 lettuce biomass was lower than FL0 during the first cycle.
- Taxon
- lettuceLactuca sativat0
- Outcome
- biomass production levelse0
- Direction
- lowere0
- Qualifier
- first cyclee0
- Comparator
- FL0e0
- Setting
- FL40e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the fluvisols, biomass production levels of FL40 were lower than those of FL0 for the first cycle.”
t0“lettuce”
Claim · model-written summary
Initial nitrate content was lower in FL40 than FL0.
Not reportedTaxon
Verbatim
e0“Indeed, the initial nitrate content in FL40 was lower than in FL0.”
Claim · model-written summary
FL40 lettuce biomass exceeded FL0 in subsequent cycles.
- Taxon
- lettuceLactuca sativat0
- Outcome
- biomass production levelse0
- Direction
- highere0
- Qualifier
- following cyclese0
- Comparator
- FL0e0
- Setting
- FL40e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The biomass production levels of FL40 were higher than those of FL0 for the following cycles.”
t0“lettuce”
The same questions in other papers
cultivation system · yield · Lactuca sativa (garden lettuce)Positive and negative results
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