Abstract
Manure-N availability must be known in order to design application practices that maximize the nutrient value of the manure while minimizing adverse environmental impacts. This study determined the effect of time and rate of liquid manure application on silage corn yield and N utilization, and residual soil nitrate at harvest, in south coastal British Columbia. Liquid dairy or liquid hog manure was applied at target rates of 0, 175, 350 or 525 kg N ha −1 , with or without addition of 100 kg N ha −1 as inorganic fertilizer, at two sites in each of 2 yr. Time of liquid-dairy-manure application was also tested at two sites in each of 2 yr with N-application treatments of: 600 kg N ha −1 as manure applied in spring; 600 kg N ha −1 as manure applied in fall; 300 kg N ha −1 as manure applied in each of spring and fall; 200 kg N ha −1 applied as inorganic fertilizer in spring; 300 kg N ha −1 as manure plus 100 kg N ha −1 as inorganic fertilizer applied in spring; and a control that received no applied N. Fall-applied manure did not increase corn yield or N uptake in the following growing season. At all sites, maximum yield was attained using manure only. Selection of proper spring application rates for manure and inorganic fertilizer were found to be equally important in minimizing residual soil nitrate at harvest. Apparent recovery of applied N in the crop ranged from 0 to 33% for manure and from 18 to 93% for inorganic fertilizer. Key words: N recovery, manure management
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Claims 6
Claim · model-written summary
Fall manure did not increase corn yield in the next season.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Fall-applied manuree0
- Outcome
- corn yielde0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fall-applied manure did not increase corn yield or N uptake in the following growing season.”
Claim · model-written summary
Fall manure did not increase corn N uptake in the next season.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Fall-applied manuree0
- Outcome
- N uptakee0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fall-applied manure did not increase corn yield or N uptake in the following growing season.”
Claim · model-written summary
Manure alone attained maximum yield at all sites.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- manure onlye0
- Outcome
- maximum yielde0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At all sites, maximum yield was attained using manure only.”
t0“silage corn”
Claim · model-written summary
Proper spring rates of manure and inorganic fertilizer were equally important to minimize residual soil nitrate.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- residual soil nitrate at harveste0
- Qualifier
- equally importante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selection of proper spring application rates for manure and inorganic fertilizer were found to be equally important in minimizing residual soil nitrate at harvest.”
t0“silage corn”
Claim · model-written summary
Apparent crop N recovery from manure ranged from 0 to 33%.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Apparent recovery of applied N in the crope0
- Value
- 0 to 33%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apparent recovery of applied N in the crop ranged from 0 to 33% for manure”
t0“silage corn”
Claim · model-written summary
Apparent crop N recovery from inorganic fertilizer ranged from 18 to 93%.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- inorganic fertilizere0
- Value
- 18 to 93%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“from 18 to 93% for inorganic fertilizer”
t0“silage corn”
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