Abstract
The excessive absorption of nitrogen (N) is easy to cause shoot overgrowth and reduce the root yield of sweet potato. The purpose of this study was to investigate the effects of potassium (K) application on N uptake, growth, and yield of sweet potato. A field experiment with four potassium application treatments (added at rates of 0, 75, 150, and 225 kg ha−1, expressed separately by K0, K75, K150, K225) was conducted on the fecund soil at Jiaozhou peninsula of China from 2014 to 2015. The results showed that total N accumulation and dry matter increases with increasing K fertilizer application. K supply reduced leaf and shoot N/K ratio, and increased the N transport rate from 9.8% to 20.1% and root N distribution rate from 50.3% to 59.3% at 150 DAP, and then increased the root dry matter distribution rate, and subsequently increased the yield by 15.3–39.0% of sweet potato. While, K supply improved the efficiency of N absorption and utilization. To enhance the sweet potato yield, K application rate of 150–225 kg ha−1 was identified as optimal.
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Claims 9
Claim · model-written summary
Total N accumulation increased with K fertilizer application.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatase1 - Treatment
- K fertilizer applicatione0
- Outcome
- total N accumulatione0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“The results showed that total N accumulation and dry matter increases with increasing K fertilizer application.”
e1“yield of sweet potato. A field experiment”
Claim · model-written summary
Dry matter increased with K fertilizer application.
- Taxon
- sweet potatoIpomoea batatase1
- Treatment
- K fertilizer applicatione0
- Outcome
- dry mattere0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that total N accumulation and dry matter increases with increasing K fertilizer application.”
e1“yield of sweet potato. A field experiment”
Claim · model-written summary
K supply reduced leaf and shoot N/K ratio.
- Taxon
- sweet potatoIpomoea batatase1
- Treatment
- K supplye0
- Outcome
- leaf and shoot N/K ratioe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K supply reduced leaf and shoot N/K ratio”
e1“yield of sweet potato. A field experiment”
Claim · model-written summary
K supply increased N transport rate from 9.8% to 20.1% at 150 DAP.
- Taxon
- sweet potatoIpomoea batatase2
- Treatment
- K supplye1
- Outcome
- N transport ratee0
- Direction
- increasede0
- Value
- 9.8% to 20.1%e0
- Qualifier
- 150 DAPe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the N transport rate from 9.8% to 20.1%”
e1“K supply reduced leaf and shoot N/K ratio, and increased the N transport rate from 9.8% to 20.1% and root N distribution rate from 50.3% to 59.3% at 150 DAP”
e2“yield of sweet potato. A field experiment”
Claim · model-written summary
K supply increased root N distribution rate from 50.3% to 59.3% at 150 DAP.
- Taxon
- sweet potatoIpomoea batatase1
- Treatment
- K supplye0
- Outcome
- root N distribution ratee0
- Direction
- increasede0
- Value
- 50.3% to 59.3%e0
- Qualifier
- 150 DAPe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K supply reduced leaf and shoot N/K ratio, and increased the N transport rate from 9.8% to 20.1% and root N distribution rate from 50.3% to 59.3% at 150 DAP”
e1“yield of sweet potato. A field experiment”
Claim · model-written summary
K supply increased root dry matter distribution rate.
- Taxon
- sweet potatoIpomoea batatase1
- Treatment
- K supplye0
- Outcome
- root dry matter distribution ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K supply reduced leaf and shoot N/K ratio, and increased the N transport rate from 9.8% to 20.1% and root N distribution rate from 50.3% to 59.3% at 150 DAP, and then increased the root dry matter distribution rate”
e1“yield of sweet potato. A field experiment”
Claim · model-written summary
K supply increased sweet potato yield by 15.3–39.0%.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- K supplye1
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 15.3–39.0%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the yield by 15.3–39.0% of sweet potato.”
e1“K supply reduced leaf and shoot N/K ratio”
Claim · model-written summary
K supply improved nitrogen absorption and utilization efficiency.
- Taxon
- sweet potatoIpomoea batatase1
- Treatment
- K supplye0
- Outcome
- efficiency of N absorption and utilizatione0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K supply improved the efficiency of N absorption and utilization.”
e1“yield of sweet potato. A field experiment”
Claim · model-written summary
The authors identify 150–225 kg ha−1 K application as optimal for sweet potato yield.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- K application rate of 150–225 kg ha−1e0
- Outcome
- enhance the sweet potato yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To enhance the sweet potato yield, K application rate of 150–225 kg ha−1 was identified as optimal.”
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