Paper · 2015 · The Journal of Animal and Plant Sciences

Response of maize to different nitrogen sources and tillage systems under humid subtropical conditions

Khurram Shahzad; Ahmad Khan; J. G. Smith; et al.

5
claims
7
verbatim quotes
7
citations
2
research areas
—
Not open access

Abstract

Tillage systems (minimum, conventional and deep) with different sources of nitrogen (bioslurry, poultry manure and chemical fertilizer) were studied through field experiments at Guj jar Seed and Nursery Farm, Haripur, KhyberPakhtunkhwa, Pakistan, for two consecutive years (2012-2013) in a randomized-complete-block-design with split plot s and four replicates. The tillage systems were kept in main plots while nitrogen treatments with diffe rent combinations of chemical fertilizer, poultry manure and bioslurry were distributed in sub-plots. The results showed that deep tillage with 100% chemical fertilizer (135 kg N ha -1 ) produced maximum plant height, stem diameter, cob length, cob diameter and number of grain rows per cob. However, deep tillage with combined application of 50% chemical fertilizer (67.5 kg N ha -1 ), 25% poultry manure (1.9 t ha -1 ) and 25% bioslurry (2.1 t ha -1 ) produced maximum 1000 grain weight, biological yield, grain yield, plant nitrogen, phosphorous and potassium concentrations in maize shoot, and seed protein contents compared to other treatments. It is concluded that integrated use of bioslurry and poultry manure with a reduced rate of chemical fertilizer can improve maize productivity and reduce cost of chemical fertilizers. The results also suggest that, in this soil and climate, deep tillage is needed to maximise yield potential.

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Claims 5

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Deep tillage with full chemical fertilizer maximized maize plant height, stem diameter, and cob length.

Taxon
maizeZea mayst0
Treatment
deep tillage with 100% chemical fertilizer (135 kg N ha -1 )e0
Outcome
maximum plant height, stem diameter, cob lengthe0
Direction
maximume0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Zea mays
Zea mays · TaxonAkwugo · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“deep tillage with 100% chemical fertilizer (135 kg N ha -1 ) produced maximum plant height, stem diameter, cob length, cob diameter and number of grain rows per cob”

✓ located verbatim in the source · abstract, characters 569–733 · show in text ↑
t0

“maize”

✓ located verbatim in the source · title, characters 12–17 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Deep tillage with full chemical fertilizer maximized maize cob diameter and grain rows per cob.

Taxon
maizeZea mayst0
Treatment
deep tillage with 100% chemical fertilizer (135 kg N ha -1 )e0
Outcome
cob diameter and number of grain rows per cobe0
Direction
maximume0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Zea mays
Zea mays · TaxonAkwugo · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“deep tillage with 100% chemical fertilizer (135 kg N ha -1 ) produced maximum plant height, stem diameter, cob length, cob diameter and number of grain rows per cob”

✓ located verbatim in the source · abstract, characters 569–733 · show in text ↑
t0

“maize”

✓ located verbatim in the source · title, characters 12–17 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Deep tillage with combined fertilizer maximized 1000 grain weight, biological yield, and grain yield.

Taxon
maizeZea mayse0
Treatment
deep tillage with combined application of 50% chemical fertilizer (67.5 kg N ha -1 ), 25% poultry manure (1.9 t ha -1 ) and 25% bioslurry (2.1 t ha -1 )e0
Outcome
1000 grain weight, biological yield, grain yielde0
Direction
maximume0
Comparator
other treatmentse0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Zea mays
Zea mays · TaxonAkwugo · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“deep tillage with combined application of 50% chemical fertilizer (67.5 kg N ha -1 ), 25% poultry manure (1.9 t ha -1 ) and 25% bioslurry (2.1 t ha -1 ) produced maximum 1000 grain weight, biological yield, grain yield, plant nitrogen, phosphorous and potassium concentrations in maize shoot, and seed protein contents compared to other treatments”

✓ located verbatim in the source · abstract, characters 744–1091 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Deep tillage with combined fertilizer maximized maize shoot nitrogen, phosphorus, and potassium concentrations.

Taxon
maizeZea mayse0
Treatment
deep tillage with combined application of 50% chemical fertilizer (67.5 kg N ha -1 ), 25% poultry manure (1.9 t ha -1 ) and 25% bioslurry (2.1 t ha -1 )e0
Outcome
plant nitrogen, phosphorous and potassium concentrations in maize shoote0
Direction
maximume0
Comparator
other treatmentse0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Zea mays
Zea mays · TaxonAkwugo · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“deep tillage with combined application of 50% chemical fertilizer (67.5 kg N ha -1 ), 25% poultry manure (1.9 t ha -1 ) and 25% bioslurry (2.1 t ha -1 ) produced maximum 1000 grain weight, biological yield, grain yield, plant nitrogen, phosphorous and potassium concentrations in maize shoot, and seed protein contents compared to other treatments”

✓ located verbatim in the source · abstract, characters 744–1091 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Deep tillage with combined fertilizer maximized maize seed protein content.

Taxon
maizeZea mayse0
Treatment
deep tillage with combined application of 50% chemical fertilizer (67.5 kg N ha -1 ), 25% poultry manure (1.9 t ha -1 ) and 25% bioslurry (2.1 t ha -1 )e0
Outcome
seed protein contentse0
Direction
maximume0
Comparator
other treatmentse0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Zea mays
Zea mays · TaxonAkwugo · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“deep tillage with combined application of 50% chemical fertilizer (67.5 kg N ha -1 ), 25% poultry manure (1.9 t ha -1 ) and 25% bioslurry (2.1 t ha -1 ) produced maximum 1000 grain weight, biological yield, grain yield, plant nitrogen, phosphorous and potassium concentrations in maize shoot, and seed protein contents compared to other treatments”

✓ located verbatim in the source · abstract, characters 744–1091 · show in text ↑

tillage · quality: protein · Zea mays (maize)Positive and negative results

30 papers: 22 positive, 8 negative or no effect

21 papers in the same direction as this paper · 6 in the opposite direction · 2 reporting no difference from an alternative

  1. no effect
  2. no effect
  3. negative

26 papers more in this group

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tillage · nutrient: content · Zea mays (maize)Positive and negative results

127 papers: 93 positive, 34 negative or no effect

92 papers in the same direction as this paper · 33 in the opposite direction · 1 reporting no difference from an alternative

  1. positive
  2. negative
  3. no effect

123 papers more in this group

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nitrogen · quality: protein · Zea mays (maize)Positive and negative results

181 papers: 164 positive, 17 negative or no effect

163 papers in the same direction as this paper · 14 in the opposite direction · 3 reporting no difference from an alternative

  1. no effect
  2. no effect
  3. negative

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fertilization · quality: protein · Zea mays (maize)Positive and negative results

262 papers: 236 positive, 26 negative or no effect

235 papers in the same direction as this paper · 23 in the opposite direction · 3 reporting no difference from an alternative

  1. no effect
  2. negative
  3. negative

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nitrogen · nutrient: content · Zea mays (maize)Positive and negative results

489 papers: 403 positive, 86 negative or no effect

402 papers in the same direction as this paper · 83 in the opposite direction · 3 reporting no difference from an alternative

  1. no effect
  2. negative
  3. no effect

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tillage · yield · Zea mays (maize)Positive and negative results

1,099 papers: 812 positive, 287 negative or no effect

811 papers in the same direction as this paper · 230 in the opposite direction · 57 reporting no difference from an alternative

  1. positive
  2. positive
  3. no effect

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fertilization · nutrient: content · Zea mays (maize)Positive and negative results

1,164 papers: 1,026 positive, 138 negative or no effect

1,025 papers in the same direction as this paper · 127 in the opposite direction · 11 reporting no difference from an alternative

  1. positive
  2. positive
  3. negative

1,160 papers more in this group

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nitrogen · yield · Zea mays (maize)Positive and negative results

2,185 papers: 1,906 positive, 279 negative or no effect

1,905 papers in the same direction as this paper · 234 in the opposite direction · 45 reporting no difference from an alternative

  1. positive
  2. positive
  3. negative

2,181 papers more in this group

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8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.

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.