Abstract
A field experiment was carried out at the Experimental Farm of Sakha Agricultural Research Station in Kafr El-Sheikh Governorate, Egypt. The experiments were conducted to study the effect of nitrogen fertilizer levels, compost extract, and inoculation with free-living di-nitrogen-fixing bacteria as well as their interaction, on soil properties, onion yield, and quality during the 2009–2010 and 2010–2011(winter seasons). The results showed that the soil-available nutrients (NPK) and organic matter (OM) contents as well as total bacterial counts were increased in the plots treated with compost extract as soil application and application of nitrogen fertilizers at 214 kg N ha−1. Soil salinity and pH were decreased under soil application of compost extract as compared with the foliar applications of compost extract. Growth and onion bulbs yield and its quality were higher due to application of compost extract three times, 40, 60, and 90 days after transplanting (DAT), and two times, 40 and 60 DAT, each at the same dose compared to all other treatments. Inoculation of onion plants increased the bulb dry weight by 18.6% and 19.2% during the 2009–2010 and 2010–2011 seasons, respectively, compared to uninoculated seeds. Based on the results of the current study, the combination of 214 kg ha−1 mineral N and biofertilizers could be considered as an integrated nutrient management to improve soil properties and onion yield.
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Claims 5
Claim · model-written summary
Compost extract applied three times increased onion growth, bulb yield and quality relative to other treatments.
- Taxon
- onion
Allium cepat0 - Treatment
- application of compost extract three times, 40, 60, and 90 days after transplanting (DAT)e0
- Outcome
- Growth and onion bulbs yield and its qualitye0
- Direction
- highere0
- Comparator
- all other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth and onion bulbs yield and its quality were higher due to application of compost extract three times, 40, 60, and 90 days after transplanting (DAT), and two times, 40 and 60 DAT, each at the same dose compared to all other treatments.”
t0“onion crop”
Claim · model-written summary
Compost extract applied twice increased onion growth, bulb yield and quality relative to other treatments.
- Taxon
- onionAllium cepat0
- Treatment
- two times, 40 and 60 DATe0
- Outcome
- Growth and onion bulbs yield and its qualitye0
- Direction
- highere0
- Comparator
- all other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth and onion bulbs yield and its quality were higher due to application of compost extract three times, 40, 60, and 90 days after transplanting (DAT), and two times, 40 and 60 DAT, each at the same dose compared to all other treatments.”
t0“onion crop”
Claim · model-written summary
Inoculation increased onion bulb dry weight by 18.6% in 2009–2010.
- Taxon
- onionAllium cepae0
- Treatment
- Inoculation of onion plantse0
- Interactor
- free-living di-nitrogen-fixing bacteriae1symbiont
- Outcome
- bulb dry weighte0
- Direction
- increasede0
- Value
- 18.6%e0
- Qualifier
- 2009–2010e0
- Comparator
- uninoculated seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation of onion plants increased the bulb dry weight by 18.6% and 19.2% during the 2009–2010 and 2010–2011 seasons, respectively, compared to uninoculated seeds.”
e1“inoculation with free-living di-nitrogen-fixing bacteria”
Claim · model-written summary
Inoculation increased onion bulb dry weight by 19.2% in 2010–2011.
- Taxon
- onionAllium cepae0
- Treatment
- Inoculation of onion plantse0
- Interactor
- free-living di-nitrogen-fixing bacteriae1symbiont
- Outcome
- bulb dry weighte0
- Direction
- increasede0
- Value
- 19.2%e0
- Qualifier
- 2010–2011e0
- Comparator
- uninoculated seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation of onion plants increased the bulb dry weight by 18.6% and 19.2% during the 2009–2010 and 2010–2011 seasons, respectively, compared to uninoculated seeds.”
e1“inoculation with free-living di-nitrogen-fixing bacteria”
Claim · model-written summary
The authors recommend mineral nitrogen plus biofertilizers to improve onion yield and soil properties.
- Taxon
- onionAllium cepae0
- Treatment
- 214 kg ha−1 mineral N and biofertilizerse0
- Outcome
- integrated nutrient management to improve soil properties and onion yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the combination of 214 kg ha−1 mineral N and biofertilizers could be considered as an integrated nutrient management to improve soil properties and onion yield.”
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