Abstract
Polyaspartic acid (PASP) is a low-cost, environmentally friendly, and multifunctional polymer material. The knowledge regarding the effects of PASPs, especially the PASPs with a different molecular weight (MW), on nitrogen use efficiency (NUE), ammonia (NH3) volatilization and nitrous oxide (N2O) emission in crop fields is scarce. In this study, maize pot experiments were conducted to evaluate three types of PASPs with different MW. Five treatments were designed: (1) application of chemical phosphorus (P) and potassium (K) fertilizer (PK), (2) PK plus urea (NPK), (3) NPK plus PASP-1 (PASPT1, MW: 5517), (4) NPK plus PASP-2 (PASPT2, MW: 6934), and (5) NPK plus PASP-3 (PASPT3, MW: 7568). The yield indicators of crop height, straw dry weight and 100-grain weight showed that PASP application improved the crop growth. In PASP3, NUE reached 46.1%, almost double of that in NPK (28.6%). Moreover, there were significantly less N losses in the forms of NH3 volatilization and NO2 emission following PASP amendment than regular urea application. Another positive impact revealed that PASP inhibited the transformation of NH4+-N to NO3–N. Among the three PASPs, PASP-3 with the highest MW overall presented optimal effects, implying that MW was a major driving factor for PASP performance on maize production.
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Claims 7
Claim · model-written summary
PASP application improved maize height, straw dry weight and 100-grain weight.
- Treatment
- PASP applicatione0
- Outcome
- crop height, straw dry weight and 100-grain weighte0
- Direction
- improvede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield indicators of crop height, straw dry weight and 100-grain weight showed that PASP application improved the crop growth.”
t0“maize pot experiments”
Claim · model-written summary
PASP3 nitrogen use efficiency reached 46.1%, compared with 28.6% under NPK.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In PASP3, NUE reached 46.1%, almost double of that in NPK (28.6%).”
t0“maize pot experiments”
Claim · model-written summary
PASP amendment significantly lowered NH3 volatilization losses relative to urea.
- Treatment
- PASP amendmente0
- Outcome
- NH3 volatilizatione0
- Direction
- lesse0
- Comparator
- regular urea applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were significantly less N losses in the forms of NH3 volatilization and NO2 emission following PASP amendment than regular urea application.”
t0“maize pot experiments”
Claim · model-written summary
PASP amendment significantly lowered NO2 emission relative to urea.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were significantly less N losses in the forms of NH3 volatilization and NO2 emission following PASP amendment than regular urea application.”
t0“maize pot experiments”
Claim · model-written summary
PASP inhibited conversion of NH4+-N to NO3–N.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PASP inhibited the transformation of NH4+-N to NO3–N.”
t0“maize pot experiments”
Claim · model-written summary
Among the three PASPs, PASP-3 had the overall optimal effects.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the three PASPs, PASP-3 with the highest MW overall presented optimal effects”
t0“maize pot experiments”
Claim · model-written summary
The authors infer molecular weight drives PASP performance in maize production.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“implying that MW was a major driving factor for PASP performance on maize production.”
t0“maize pot experiments”
The same questions in other papers
other · environment: emissions · Zea mays (maize)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- negative
- no effect
3 papers more in this group
See all 7 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.