Abstract
Abstract Increasing use of N fertilizer for crop production necessitates more rapid estimates on N provided by the soil in order to prevent under‐ or overfertilization and their adverse effect on plant nutrition and environmental quality. A study was conducted to investigate the responses of arginine ammonification (AA), L‐glutaminase activity (LG), soil N–mineralization indices, corn ( Zea mays L.) crop–yield estimation, and corn N uptake to application of organic amendments. The relationships between corn N uptake and the microbial and enzymatic processes which are basically related to N mineralization in soil were also studied. The soil samples were collected from 0–15 cm depth of a calcareous soil that was annually treated with 0, 25, or 100 Mg ha –1 (dry‐weight basis) of sewage sludge and cow manure for 7 consecutive years. Soil total N (TN), potentially mineralizable N (N 0 ), and initial potential rates of N mineralization ( k N 0 ) were significantly greater in sewage sludge–treated than in cow manure–treated soils. However, the amendment type did not influence soil organic C (SOC), AA, LG, and anaerobic index of N mineralization (N ana ). The application rates proportionally increased N‐availability indices in soil. Corn N concentration and uptake were correlated with indices of mineralizable N. A multiple stepwise model using AA and N ana as parameters provided the best predictor of corn N concentration (R = 0.86, p < 0.001). Another model using only LG provided the best predictor of corn N uptake (R = 0.78, p < 0.001). This results showed that sewage‐sludge and cow‐manure application is readily reflected in certain soil biological properties and that the biological tests may be useful in predicting N mineralization and availability in soil.
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Claims 9
Claim · model-written summary
Sewage-sludge-treated soil had significantly greater total N than cow-manure-treated soil.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- sewage sludge–treatede0
- Outcome
- Soil total Ne0
- Direction
- greatere0
- Comparator
- cow manure–treated soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil total N (TN), potentially mineralizable N (N 0 ), and initial potential rates of N mineralization ( k N 0 ) were significantly greater in sewage sludge–treated than in cow manure–treated soils”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Potentially mineralizable N was significantly greater with sewage sludge than cow manure.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- sewage sludge–treatede0
- Outcome
- potentially mineralizable Ne0
- Direction
- greatere0
- Comparator
- cow manure–treated soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil total N (TN), potentially mineralizable N (N 0 ), and initial potential rates of N mineralization ( k N 0 ) were significantly greater in sewage sludge–treated than in cow manure–treated soils”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Initial potential N mineralization rates were significantly greater with sewage sludge than cow manure.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- sewage sludge–treatede0
- Outcome
- initial potential rates of N mineralizatione0
- Direction
- greatere0
- Comparator
- cow manure–treated soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil total N (TN), potentially mineralizable N (N 0 ), and initial potential rates of N mineralization ( k N 0 ) were significantly greater in sewage sludge–treated than in cow manure–treated soils”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Amendment type did not influence soil organic C, AA, LG, or anaerobic N mineralization index.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- amendment typee0
- Outcome
- soil organic C (SOC), AA, LG, and anaerobic index of N mineralizatione0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amendment type did not influence soil organic C (SOC), AA, LG, and anaerobic index of N mineralization (N ana )”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Higher application rates proportionally increased soil N-availability indices.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- application ratese0
- Outcome
- N‐availability indices in soile0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application rates proportionally increased N‐availability indices in soil”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Corn nitrogen concentration correlated with mineralizable N indices.
- Taxon
- CornZea mays subsp. mayse0
- Outcome
- N concentratione0
- Comparator
- indices of mineralizable Ne0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn N concentration and uptake were correlated with indices of mineralizable N”
Claim · model-written summary
Corn nitrogen uptake correlated with mineralizable N indices.
- Taxon
- CornZea mays subsp. mayse0
- Outcome
- uptakee0
- Comparator
- indices of mineralizable Ne0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn N concentration and uptake were correlated with indices of mineralizable N”
Claim · model-written summary
The AA and N anaerobic model was the best predictor of corn N concentration, with R = 0.86.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn N concentratione0
- Direction
- beste0
- Value
- R = 0.86e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A multiple stepwise model using AA and N ana as parameters provided the best predictor of corn N concentration (R = 0.86, p < 0.001)”
Claim · model-written summary
The LG-only model was the best predictor of corn N uptake, with R = 0.78.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn N uptakee0
- Direction
- beste0
- Value
- R = 0.78e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Another model using only LG provided the best predictor of corn N uptake (R = 0.78, p < 0.001)”
The same questions in other papers
other · soil: chemistry · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 35 in the opposite direction
- positive
- positive
- positive
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