Abstract
SUMMARY The influence of various nitrogen and phosphorus sources, applied at the preseeding stage with two placement methods, on maize yield and fertilizer utilization, was studied in two field experiments and a pot experiment with a calcareous, heavy to medium heavy textured recent alluvial soil. Phosphorus alone had no effect on crop yield. Nitrogen alone or nitrogen (various forms) and phosphorus had a clear positive effect on crop yield. As to the various sources the observed differences in the crop yield of the field experiments were not significant, while in the pot experiment ammonium sulphate gave the highest yields. The data on the phosphate concentrations in the tops derived from phosphate fertilizer (Pf) indicate that the presence of nitrogen increased the utilization of phosphorus fertilizer. From the tested placement methods the incorporation method appears clearly superior in the pot experiment with a similar trend in the field experiment for all sources except ammonium phosphate-sulphate. The utilization coefficients of the nitrogen fertilizer sources suggest that ammonium and urea were better utilized than nitrates, that the higher nitrogen utilization reflected higher yields and that phosphorus fertilizer exerted a beneficial effect on nitrogen fertilizer utilization. Finally they suggest that the addition of 120 kg N/ha enhanced the amount of soil nitrogen taken up in the maize grain by 53%.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 13
Claim · model-written summary
Phosphorus alone had no effect on maize yield.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus alone had no effect on crop yield”
t0“maize (Zea mays L.)”
Claim · model-written summary
Nitrogen alone increased maize yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen alone or nitrogen (various forms) and phosphorus had a clear positive effect on crop yield”
t0“maize (Zea mays L.)”
Claim · model-written summary
Combined nitrogen and phosphorus increased maize yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen (various forms) and phosphorus had a clear positive effect on crop yield”
t0“maize (Zea mays L.)”
Claim · model-written summary
Yield differences among fertilizer sources in field experiments were not significant.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the observed differences in the crop yield of the field experiments were not significant”
t0“maize (Zea mays L.)”
Claim · model-written summary
Ammonium sulphate gave the highest maize yields in the pot experiment.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the pot experiment ammonium sulphate gave the highest yields”
t0“maize (Zea mays L.)”
Claim · model-written summary
Nitrogen increased maize utilization of phosphorus fertilizer.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the presence of nitrogen increased the utilization of phosphorus fertilizer”
t0“maize (Zea mays L.)”
Claim · model-written summary
Incorporation placement was superior in the pot experiment.
- Treatment
- incorporation methode0
- Outcome
- clearly superiore0
- Direction
- clearly superiore0
- Setting
- pot experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the incorporation method appears clearly superior in the pot experiment”
t0“maize (Zea mays L.)”
Claim · model-written summary
Incorporation placement showed a similar superior trend in field experiments except for ammonium phosphate-sulphate.
- Treatment
- incorporation methode1
- Outcome
- similar trende0
- Direction
- superiore1
- Qualifier
- except ammonium phosphate-sulphatee0
- Setting
- field experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with a similar trend in the field experiment for all sources except ammonium phosphate-sulphate”
e1“the incorporation method appears clearly superior in the pot experiment”
t0“maize (Zea mays L.)”
Claim · model-written summary
Ammonium fertilizer was better utilized than nitrate fertilizer.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ammonium and urea were better utilized than nitrates”
t0“maize (Zea mays L.)”
Claim · model-written summary
Urea fertilizer was better utilized than nitrate fertilizer.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ammonium and urea were better utilized than nitrates”
t0“maize (Zea mays L.)”
Claim · model-written summary
Higher nitrogen utilization was associated with higher yields.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher nitrogen utilization reflected higher yields”
t0“maize (Zea mays L.)”
Claim · model-written summary
Phosphorus fertilizer benefited nitrogen fertilizer utilization.
- Treatment
- phosphorus fertilizere0
- Outcome
- nitrogen fertilizer utilizatione0
- Direction
- beneficial effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphorus fertilizer exerted a beneficial effect on nitrogen fertilizer utilization”
t0“maize (Zea mays L.)”
Claim · model-written summary
Adding 120 kg N/ha enhanced soil nitrogen taken up in maize grain by 53%.
- Treatment
- 120 kg N/hae0
- Outcome
- amount of soil nitrogen taken up in the maize graine0
- Direction
- enhancede0
- Value
- 53%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of 120 kg N/ha enhanced the amount of soil nitrogen taken up in the maize grain by 53%”
The same questions in other papers
ammonium sulfate · yield · Zea mays (maize)Results differ
30 papers in the same direction as this paper · 5 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- negative
33 papers more in this group
See all 37 papers →nitrogen · soil: chemistry · Zea mays (maize)Positive and negative results
39 papers in the same direction as this paper · 9 in the opposite direction
- positive
- negative
- negative
45 papers more in this group
See all 49 papers →phosphorus · yield · Zea mays (maize)Positive and negative results
548 papers in the same direction as this paper · 69 in the opposite direction · 9 reporting no difference from an alternative
- no effect
- no effect
- no effect
623 papers more in this group
See all 627 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
- no effect
- positive
- 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.