Abstract
A field trial at the Institute of Forage Crops, Pleven, Bulgaria (2000-2003) was conducted to study the effect of mineral and organic fertilization on seed yield of alfalfa, root biomass accumulation and soil humus content. Alfalfa variety 'Victoria' was grown on a leached chernozem soil without irrigation. Rates of 70, 140 and 210 kg ha-1 mineral nitrogen (active ingredient) were tested as ammonium nitrate and well-matured cattle manure. It was found that mineral and manure fertilization at 140 and 210 kg ha-1 increased seed yield by 9.9% and 20.9% for mineral, and by 30.3% and 40.6% for manure. Seed yield was more stable under manure fertilization compared with mineral fertilization. Alfalfa accumulated between 2669 and 3098 kg ha-1 dry root mass after mineral fertilization and between 3310 and 3570 kg ha-1 after manure application. Additional root mass of 482 to 698 kg ha-1 was found to be accumulated for manure treatments compared to mineral fertilization. High ratios of nitrogen yields (192 - 216 kg ha-1) and plant available nitrogen (77 - 86 kg ha-1) have been obtained from the treatments with manure. The highest amount of humus remained in the soil after fertilization of alfalfa with manure at the rate of 210 kg ha-1.
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Claims 11
Claim · model-written summary
Mineral nitrogen at 140 kg ha-1 increased alfalfa seed yield by 9.9%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mineral and manure fertilization at 140 and 210 kg ha-1 increased seed yield by 9.9% and 20.9% for mineral, and by 30.3% and 40.6% for manure”
t0“alfalfa”
Claim · model-written summary
Mineral nitrogen at 210 kg ha-1 increased alfalfa seed yield by 20.9%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mineral and manure fertilization at 140 and 210 kg ha-1 increased seed yield by 9.9% and 20.9% for mineral, and by 30.3% and 40.6% for manure”
t0“alfalfa”
Claim · model-written summary
Manure at 140 kg ha-1 increased alfalfa seed yield by 30.3%.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- manure fertilization at 140e0
- Outcome
- seed yielde0
- Direction
- increasede0
- Value
- 30.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mineral and manure fertilization at 140 and 210 kg ha-1 increased seed yield by 9.9% and 20.9% for mineral, and by 30.3% and 40.6% for manure”
t0“alfalfa”
Claim · model-written summary
Manure at 210 kg ha-1 increased alfalfa seed yield by 40.6%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mineral and manure fertilization at 140 and 210 kg ha-1 increased seed yield by 9.9% and 20.9% for mineral, and by 30.3% and 40.6% for manure”
t0“alfalfa”
Claim · model-written summary
Seed yield was more stable with manure than mineral fertilization.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- manure fertilizatione0
- Outcome
- Seed yielde0
- Direction
- more stablee0
- Comparator
- mineral fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield was more stable under manure fertilization compared with mineral fertilization”
t0“alfalfa”
Claim · model-written summary
Mineral fertilization yielded 2669 to 3098 kg ha-1 dry alfalfa root mass.
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- mineral fertilizatione0
- Outcome
- dry root masse0
- Value
- 2669 and 3098 kg ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa accumulated between 2669 and 3098 kg ha-1 dry root mass after mineral fertilization”
Claim · model-written summary
Manure application yielded 3310 to 3570 kg ha-1 dry alfalfa root mass.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- manure applicatione0
- Outcome
- root masse1
- Value
- 3310 and 3570 kg ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“between 3310 and 3570 kg ha-1 after manure application”
t0“fertilization of alfalfa”
e1“dry root mass after mineral fertilization”
Claim · model-written summary
Manure treatments accumulated 482 to 698 kg ha-1 more root mass than mineral fertilization.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- manure treatmentse0
- Outcome
- root masse0
- Direction
- Additionale0
- Value
- 482 to 698 kg ha-1e0
- Comparator
- mineral fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additional root mass of 482 to 698 kg ha-1 was found to be accumulated for manure treatments compared to mineral fertilization”
t0“alfalfa”
Claim · model-written summary
Manure treatments produced nitrogen yields of 192–216 kg ha-1.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- treatments with manuree0
- Outcome
- nitrogen yieldse0
- Value
- 192 - 216 kg ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High ratios of nitrogen yields (192 - 216 kg ha-1) and plant available nitrogen (77 - 86 kg ha-1) have been obtained from the treatments with manure”
t0“alfalfa”
Claim · model-written summary
Manure treatments produced 77–86 kg ha-1 plant available nitrogen.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- treatments with manuree0
- Outcome
- plant available nitrogene0
- Value
- 77 - 86 kg ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High ratios of nitrogen yields (192 - 216 kg ha-1) and plant available nitrogen (77 - 86 kg ha-1) have been obtained from the treatments with manure”
t0“alfalfa”
Claim · model-written summary
Manure at 210 kg ha-1 left the most soil humus.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- manure at the rate of 210 kg ha-1e0
- Outcome
- humus remained in the soile0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest amount of humus remained in the soil after fertilization of alfalfa with manure at the rate of 210 kg ha-1”
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fertilization · growth · Medicago sativa (alfalfa)Results differ
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- negative
- no effect
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150 papers in the same direction as this paper · 30 in the opposite direction · 3 reporting no difference from an alternative
- positive
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See all 184 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.