Abstract
Nitrogen is one of the most critical nutrients affecting sweetpotato yield. This study was conducted to 1) evaluate the growth and yield response of sweetpotato NSIC SP 33 to different levels of N; and 2) determine the relationship between N level and root yield. A screenhouse experiment laid out in Completely Randomized Design (CRD) was carried out using five (5) N levels: 0,40, 80, 120 and 160kg ha-1, each replicated thrice.Thetotal amount of N (as urea) was applied twice, one-half at planting and the other half at six weeks after planting (6 WAP) along with a blanket application of solophos and muriate of potash at 40 and 60kg ha-1 P2O5and K2O. An alluvial Umingan sandy loam soil (lnceptisol) was used as medium. Levels of N significantly increased the leaf area, fresh herbage, total root yield, biomass, dry matter yield, shoot-root ratio, weight and number of marketable roots. Harvest index (HI) of plants applied with 40 and 80kg N ha-1 were comparable to those applied with 0 N. Increasing levels of N from 0 to 1 60kg ha-1 resulted in higher total crude protein (CP) and total N in the leaves. N uptake was higher in N-applied plants. Application of 40 and 80kg ha-1 N produced the highest root yield, above which root yield declined. Relationship between N level and root yield developed through regression analysis showed a quadratic function of Y=111.1794+1.2098x-0.00897x2 and R-square of 0.9904 which suggest that inherent soil N affected root development.
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Claims 10
Claim · model-written summary
Nitrogen levels significantly increased sweetpotato leaf area and fresh herbage.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- Levels of Ne0
- Outcome
- leaf area, fresh herbagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“Levels of N significantly increased the leaf area, fresh herbage, total root yield, biomass, dry matter yield, shoot-root ratio, weight and number of marketable roots”
t0“sweetpotato”
Claim · model-written summary
Nitrogen levels significantly increased total root yield, biomass, and dry matter yield.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- Levels of Ne0
- Outcome
- total root yield, biomass, dry matter yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of N significantly increased the leaf area, fresh herbage, total root yield, biomass, dry matter yield, shoot-root ratio, weight and number of marketable roots”
t0“sweetpotato”
Claim · model-written summary
Nitrogen levels significantly increased shoot-root ratio and marketable root weight and number.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- Levels of Ne0
- Outcome
- shoot-root ratio, weight and number of marketable rootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of N significantly increased the leaf area, fresh herbage, total root yield, biomass, dry matter yield, shoot-root ratio, weight and number of marketable roots”
t0“sweetpotato”
Claim · model-written summary
Harvest index under 40 and 80kg N ha-1 was comparable with zero N.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 40 and 80kg N ha-1e0
- Outcome
- Harvest index (HI)e0
- Direction
- comparablee0
- Comparator
- 0 Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harvest index (HI) of plants applied with 40 and 80kg N ha-1 were comparable to those applied with 0 N”
t0“sweetpotato”
Claim · model-written summary
Leaf crude protein rose with nitrogen levels.
- Taxon
- sweetpotatoIpomoea batatast0
- Organ / stage
- leavese0
- Treatment
- Increasing levels of N from 0 to 1 60kg ha-1e0
- Outcome
- total crude protein (CP)e0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing levels of N from 0 to 1 60kg ha-1 resulted in higher total crude protein (CP) and total N in the leaves”
t0“sweetpotato”
Claim · model-written summary
Leaf total N rose with nitrogen levels.
- Taxon
- sweetpotatoIpomoea batatast0
- Organ / stage
- leavese0
- Treatment
- Increasing levels of N from 0 to 1 60kg ha-1e0
- Outcome
- total Ne0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing levels of N from 0 to 1 60kg ha-1 resulted in higher total crude protein (CP) and total N in the leaves”
t0“sweetpotato”
Claim · model-written summary
N uptake was higher in fertilized plants.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- N-appliede0
- Outcome
- N uptakee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N uptake was higher in N-applied plants”
t0“sweetpotato”
Claim · model-written summary
The highest root yield occurred at 40 and 80kg ha-1 N; yield declined above these rates.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 40 and 80kg ha-1 Ne0
- Outcome
- root yielde0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 40 and 80kg ha-1 N produced the highest root yield, above which root yield declined”
t0“sweetpotato”
Claim · model-written summary
Root yield declined above 80kg ha-1 N.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 40 and 80kg ha-1 Ne0
- Outcome
- root yielde0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 40 and 80kg ha-1 N produced the highest root yield, above which root yield declined”
t0“sweetpotato”
Claim · model-written summary
A quadratic regression related N level to root yield with R-square 0.9904.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- Relationship between N level and root yielde0
- Value
- 0.9904e0
- Qualifier
- quadratic functione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relationship between N level and root yield developed through regression analysis showed a quadratic function of Y=111.1794+1.2098x-0.00897x2 and R-square of 0.9904”
t0“sweetpotato”
The same questions in other papers
nitrogen · yield · Ipomoea batatas (sweet potato)Results differ
3 papers in the same direction as this paper · 31 in the opposite direction
- positive
- positive
- positive
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