Abstract
Abstract Sweet potato ( Ipomoea batatas L.) is a new tuber crop grown in Greece. It constitutes an innovative dietary component for both humans and animals, due to its nutritional properties. The cultivation of sweet potato focuses on the growth of both tubers and plants. Nitrogen is considered an essential element for almost all crops. This study set out to compare the effect of nitrogen inhibitors on yield components of sweet potato. In the literature, it is stated that in sweet potato cultivation nitrogen mainly affects the plants’ growth such as the tuber's yield and some quality characteristics such as dry matter and protein content. To furthermore explore this particular area, field experiments took place in West Greece, during the years 2018 and 2019. Several urea combination treatments were used in the experimental process. The treatments were urea (46-0-0), urea with urease inhibitor (UI), urea with nitrification inhibitor (NI), urea with double inhibitors (UI + NI) and control (without fertilizer) in a randomised complete block design. Leaf area index (LAI) was significantly affected by the fertilizer marking the highest value of 5.35 under urea + UI + NI treatment. Marketable yield was profoundly affected by the fertilizer in the experimental years and ranged from 18,180 to 23,230 Kg · ha −1 whereas non-marketable yield was not affected by the fertilizer. A considerable impact of fertilizers was noticed on yield where the highest value was 30,923 Kg · ha −1 under urea + NI + UI treatment. The percentage of nitrogen on tubers and upper parts was significantly affected by the fertilizers. Nitrogen markers, such as nitrogen use efficiency (NUE), nitrogen harvest index and nitrogen agronomic efficiency (NAE), were used to evaluate nitrogen release. A significant positive correlation was noticed between marketable yield and NUE (0.774). Also, the significant increase in yield showed a positive correlation with NAE (0.727). For yield components of sweet potato, the highest values were observed in urea with double inhibitors treatment in both experimental years.
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Claims 9
Claim · model-written summary
Urea with both inhibitors produced the highest leaf area index, 5.35.
- Taxon
- Sweet potato
_Flower.jpg?width=60)
Ipomoea batatase1 - Treatment
- urea + UI + NIe0
- Outcome
- Leaf area index (LAI)e0
- Direction
- higheste0
- Value
- 5.35e0
- Comparator
- control (without fertilizer)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“Leaf area index (LAI) was significantly affected by the fertilizer marking the highest value of 5.35 under urea + UI + NI treatment.”
e1“Sweet potato ( Ipomoea batatas L.)”
e2“control (without fertilizer)”
Claim · model-written summary
Marketable yield varied with fertilizer, ranging from 18,180 to 23,230 Kg · ha −1.
- Taxon
- Sweet potatoIpomoea batatase1
- Treatment
- fertilizere0
- Outcome
- Marketable yielde0
- Value
- 18,180 to 23,230 Kg · ha −1e0
- Comparator
- control (without fertilizer)e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marketable yield was profoundly affected by the fertilizer in the experimental years and ranged from 18,180 to 23,230 Kg · ha −1”
e1“Sweet potato ( Ipomoea batatas L.)”
e2“control (without fertilizer)”
Claim · model-written summary
Non-marketable yield was not affected by fertilizer.
- Taxon
- Sweet potatoIpomoea batatase1
- Treatment
- fertilizere0
- Outcome
- non-marketable yielde0
- Direction
- not affectede0
- Comparator
- control (without fertilizer)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-marketable yield was not affected by the fertilizer”
e1“Sweet potato ( Ipomoea batatas L.)”
e2“control (without fertilizer)”
Claim · model-written summary
Urea with both inhibitors had the highest yield at 30,923 Kg · ha −1.
- Taxon
- Sweet potatoIpomoea batatase1
- Treatment
- urea + NI + UIe0
- Outcome
- yielde3
- Direction
- higheste0
- Value
- 30,923 Kg · ha −1e0
- Comparator
- control (without fertilizer)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest value was 30,923 Kg · ha −1 under urea + NI + UI treatment”
e1“Sweet potato ( Ipomoea batatas L.)”
e2“control (without fertilizer)”
e3“A considerable impact of fertilizers was noticed on yield”
Claim · model-written summary
Fertilizers significantly affected tuber nitrogen percentage.
- Taxon
- Sweet potatoIpomoea batatase1
- Treatment
- fertilizerse0
- Outcome
- percentage of nitrogen on tuberse0
- Comparator
- control (without fertilizer)e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of nitrogen on tubers and upper parts was significantly affected by the fertilizers.”
e1“Sweet potato ( Ipomoea batatas L.)”
e2“control (without fertilizer)”
Claim · model-written summary
Fertilizers significantly affected upper-part nitrogen percentage.
- Taxon
- Sweet potatoIpomoea batatase1
- Treatment
- fertilizerse0
- Outcome
- percentage of nitrogen on tubers and upper partse0
- Comparator
- control (without fertilizer)e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of nitrogen on tubers and upper parts was significantly affected by the fertilizers.”
e1“Sweet potato ( Ipomoea batatas L.)”
e2“control (without fertilizer)”
Claim · model-written summary
Marketable yield was positively correlated with nitrogen use efficiency at 0.774.
- Taxon
- Sweet potatoIpomoea batatase1
- Outcome
- marketable yielde0
- Direction
- positivee0
- Value
- 0.774e0
- Comparator
- NUEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant positive correlation was noticed between marketable yield and NUE (0.774).”
e1“Sweet potato ( Ipomoea batatas L.)”
Claim · model-written summary
Yield increase was positively correlated with nitrogen agronomic efficiency at 0.727.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the significant increase in yield showed a positive correlation with NAE (0.727).”
e1“Sweet potato ( Ipomoea batatas L.)”
Claim · model-written summary
Yield components were highest under urea with double inhibitors in both years.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- urea with double inhibitors treatmente0
- Outcome
- yield componentse0
- Direction
- higheste0
- Qualifier
- both experimental yearse0
- Comparator
- control (without fertilizer)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For yield components of sweet potato, the highest values were observed in urea with double inhibitors treatment in both experimental years.”
e1“control (without fertilizer)”
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