Abstract
The release rates of different nitrogen (N) fertilizers and their matching with plant demand determine crop yields. A field experiment was conducted to investigate the effect of using no fertilizer (N0), regular urea applied at rates of 180 kg ha−1 (N180) and 240 kg ha−1 (N240), controlled-release urea applied at a rate of 180 kg ha−1 (H180), and polyaspartic acid urea (PASP) on maize seed yield, soil microbial community diversity, and leaf N-converting enzymes. XianYu 688 was selected as the test maize variety. All cobs in the sample plots were collected per unit area to estimate maize yield. The enzyme-linked immunosorbent assay (ELISA) was used to determine leaf N-converting enzyme activities. Soil DNA was extracted using the Power Max Soil DNA Isolation Kit and subsequently sequenced using the Illumina HiSeq platform (PE 2500) to determine the microbial diversity and communities. The results showed that the highest seed yields were obtained under N240 and PASP180 treatments. The N-partial factor productivity of the PASP180 fertilizer was significantly higher than that of the other treatments. PASP treatment significantly increased maize seed yield due to the potential of storing more N in the ear leaves. Additionally, partial N productivity showed a significant positive correlation with the soil microbial Shannon, Chao1, and ACE indices, indicating that increased soil microbial diversity promoted N efficiency in maize. Further analysis revealed that PASP treatment increased seed yield by promoting leaf N-converting enzyme activity and soil microbial diversity. The results revealed that nitrate reductase (NR), glutamate synthase (GOGAT), and glutaminase (GLNS) enzyme activities in maize leaves were higher under the PASP treatment than under other fertilizer treatments. The PASP treatment significantly enhanced soil microbial diversity at different maize stages. Our study revealed the effects of using different N fertilizers on seed yield by examining their impact on soil microbial diversity and leaf N-converting enzyme activity. This study provides essential insights into maize production and soil fertility maintenance in the North China Plain.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
N240 produced one of the highest seed yields.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest seed yields were obtained under N240 and PASP180 treatments”
t0“Maize Yield”
Claim · model-written summary
PASP180 produced one of the highest seed yields.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest seed yields were obtained under N240 and PASP180 treatments”
t0“Maize Yield”
Claim · model-written summary
PASP180 had significantly higher N-partial factor productivity than other treatments.
- Treatment
- PASP180e0
- Outcome
- N-partial factor productivitye0
- Direction
- highere0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N-partial factor productivity of the PASP180 fertilizer was significantly higher than that of the other treatments”
t0“Maize Yield”
Claim · model-written summary
PASP significantly increased maize seed yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PASP treatment significantly increased maize seed yield due to the potential of storing more N in the ear leaves”
Claim · model-written summary
The authors attribute PASP-related yield gain to potential greater nitrogen storage in ear leaves.
- Treatment
- PASP treatmente0
- Outcome
- seed yielde0
- Qualifier
- potential of storing more N in the ear leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PASP treatment significantly increased maize seed yield due to the potential of storing more N in the ear leaves”
Claim · model-written summary
Partial N productivity correlated positively with soil microbial Shannon, Chao1 and ACE indices.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“partial N productivity showed a significant positive correlation with the soil microbial Shannon, Chao1, and ACE indices”
t0“Maize Yield”
Claim · model-written summary
The authors interpret greater soil microbial diversity as promoting maize N efficiency.
- Interactor
- soil microbiale0symbiont
- Outcome
- N efficiencye0
- Qualifier
- increased soil microbial diversitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased soil microbial diversity promoted N efficiency in maize”
Claim · model-written summary
The authors attribute PASP-associated seed yield increase to leaf N-converting enzyme activity and soil microbial diversity.
- Treatment
- PASP treatmente0
- Outcome
- seed yielde0
- Qualifier
- leaf N-converting enzyme activity and soil microbial diversitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PASP treatment increased seed yield by promoting leaf N-converting enzyme activity and soil microbial diversity”
t0“Maize Yield”
Claim · model-written summary
PASP produced higher nitrate reductase, glutamate synthase and glutaminase activities in maize leaves than other fertilizers.
- Organ / stage
- leavese0
- Treatment
- PASP treatmente0
- Outcome
- nitrate reductase (NR), glutamate synthase (GOGAT), and glutaminase (GLNS) enzyme activitiese0
- Direction
- highere0
- Comparator
- other fertilizer treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate reductase (NR), glutamate synthase (GOGAT), and glutaminase (GLNS) enzyme activities in maize leaves were higher under the PASP treatment than under other fertilizer treatments”
Claim · model-written summary
PASP significantly enhanced soil microbial diversity across maize stages.
- Treatment
- PASP treatmente0
- Interactor
- soil microbiale0symbiont
- Outcome
- soil microbial diversitye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PASP treatment significantly enhanced soil microbial diversity at different maize stages”
The same questions in other papers
nitrogen · soil: biology · Zea mays (maize)Positive and negative results
22 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
20 papers more in this group
See all 24 papers →nitrogen · physiology: enzyme activity · Zea mays (maize)Positive and negative results
22 papers in the same direction as this paper · 11 in the opposite direction
- negative
- no effect
- negative
30 papers more in this group
See all 34 papers →nitrogen · yield · Zea mays (maize)Positive and negative results
1,905 papers in the same direction as this paper · 234 in the opposite direction · 45 reporting no difference from an alternative
- negative
- no effect
- negative
2,181 papers more in this group
See all 2,185 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.