Abstract
Humic substances (HS) extracted from various organic materials have been shown to stimulate plant growth. However, scarce information is available on the impact of different methods of application of HS on nutrient status of vegetable species, especially in soil and climate conditions of the temperate zone. The goal of the present study was to evaluate the effect of pre-plant (bulblet soaking) and foliar application of commercially-produced peat and vermicompost-derived HS preparations on nutrient status and yield of onion (Allium cepa L.) in field experiments using two farming systems - conventional and organic. Although the effect was variable between nutrients, dependent on timing, application methods and farming systems, pre-plant and foliar HS tested was hardly effective in preventing nutrient (S, Zn, B) deficiencies limiting onion yield. Moreover, HS induced changes that significantly reduced nutrient status of organically grown onion and had detrimental effect on yield. Although one-year results did not suggest a benefit from HS application, further studies are necessary to evaluate the possible effectiveness of peat and vermicompost extracts on onion production in Latvia.
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Claims 4
Claim · model-written summary
Preplant and foliar humic substances were hardly effective in preventing nutrient deficiencies limiting onion yield.
- Taxon
- onion
Allium cepat0 - Treatment
- pre-plant and foliar HSe0
- Outcome
- nutrient (S, Zn, B) deficiencies limiting onion yielde0
- Direction
- hardly effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion (Allium Cepa L.)”
e0“pre-plant and foliar HS tested was hardly effective in preventing nutrient (S, Zn, B) deficiencies limiting onion yield”
Claim · model-written summary
Humic substances significantly reduced nutrient status of organically grown onion.
- Taxon
- onionAllium cepae0
- Treatment
- HSe0
- Outcome
- nutrient status of organically grown onione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion (Allium Cepa L.)”
e0“HS induced changes that significantly reduced nutrient status of organically grown onion and had detrimental effect on yield”
Claim · model-written summary
Humic substances detrimentally affected onion yield.
- Taxon
- onionAllium cepae0
- Treatment
- HSe0
- Outcome
- yielde0
- Direction
- detrimentale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion (Allium Cepa L.)”
e0“HS induced changes that significantly reduced nutrient status of organically grown onion and had detrimental effect on yield”
Claim · model-written summary
The authors call for further study of peat and vermicompost extracts for onion production in Latvia.
- Taxon
- onionAllium cepae0
- Outcome
- further studies are necessary to evaluate the possible effectiveness of peat and vermicompost extractse0
- Setting
- Latviae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion (Allium Cepa L.)”
e0“further studies are necessary to evaluate the possible effectiveness of peat and vermicompost extracts on onion production in Latvia”
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See all 131 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.