Abstract
Potato tuber initiation and its growth are key processes determining tuber yield, which are closely related to stolon growth, and are influenced by many factors including N nutrition. We investigated the influences of different forms of nitrogen (N) on stolon and tuber growth in sand culture with a nitrification inhibitor during 2010 – 2011, and using two potato cultivars. Plants supplied with NO3-N (N as nitrate, NO3-) produced more and thicker stolons than those supplied with NH4-N (N as ammonium, NH4+) at tuber initiation stage. In the plants fed NO3-N, the stolon tips swelled or formed tubers earlier and produced more tubers than in those fed with NH4-N. However, no significant difference was observed among N forms in terms of tuber yield at harvest, this may have been because of the shoot growth rate at tuber initiation stage was lower in the plants fed NO3-N. During the tuber bulking stage, the difference in shoot DWs among N forms began to decrease, and the shoot DW of plants fed NO3-N was even heavier than those fed NH4-N in some cases. The influence of N form on potato plant growth may therefore vary with the potato growth stage.
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Claims 8
Claim · model-written summary
Nitrate-fed potato plants made more stolons than ammonium-fed plants at tuber initiation.
- Taxon
- Potato
Solanum tuberosumt0 - Organ / stage
- tuber initiation stagee0
- Treatment
- NO3-Ne0
- Outcome
- stolonse0
- Direction
- moree0
- Comparator
- NH4-Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants supplied with NO3-N (N as nitrate, NO3-) produced more and thicker stolons than those supplied with NH4-N (N as ammonium, NH4+) at tuber initiation stage”
t0“Potato”
Claim · model-written summary
Nitrate-fed plants made thicker stolons than ammonium-fed plants.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- tuber initiation stagee0
- Treatment
- NO3-Ne0
- Outcome
- stolonse0
- Direction
- thickere0
- Comparator
- NH4-Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants supplied with NO3-N (N as nitrate, NO3-) produced more and thicker stolons than those supplied with NH4-N (N as ammonium, NH4+) at tuber initiation stage”
t0“Potato”
Claim · model-written summary
Nitrate-fed stolon tips swelled or formed tubers earlier than ammonium-fed tips.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- NO3-Ne0
- Outcome
- stolon tips swelled or formed tuberse0
- Direction
- earliere0
- Comparator
- NH4-Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the plants fed NO3-N, the stolon tips swelled or formed tubers earlier and produced more tubers than in those fed with NH4-N”
t0“Potato”
Claim · model-written summary
Nitrate-fed plants produced more tubers than ammonium-fed plants.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the plants fed NO3-N, the stolon tips swelled or formed tubers earlier and produced more tubers than in those fed with NH4-N”
t0“Potato”
Claim · model-written summary
Harvest tuber yield did not differ significantly between nitrogen forms.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- N formse0
- Outcome
- tuber yielde0
- Direction
- no significant differencee0
- Qualifier
- at harveste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant difference was observed among N forms in terms of tuber yield at harvest”
t0“Potato”
Claim · model-written summary
Nitrate-fed plants had lower shoot growth rate at tuber initiation, offered as a possible explanation for unchanged yield.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- tuber initiation stagee0
- Treatment
- NO3-Ne0
- Outcome
- shoot growth ratee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot growth rate at tuber initiation stage was lower in the plants fed NO3-N”
t0“Potato”
Claim · model-written summary
Shoot dry-weight differences between nitrogen forms decreased during tuber bulking.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- tuber bulking stagee0
- Outcome
- difference in shoot DWse0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the tuber bulking stage, the difference in shoot DWs among N forms began to decrease”
t0“Potato”
Claim · model-written summary
Nitrate-fed shoots were sometimes heavier than ammonium-fed shoots during tuber bulking.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- NO3-Ne0
- Outcome
- shoot DWe0
- Direction
- heaviere0
- Qualifier
- in some casese0
- Comparator
- NH4-Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot DW of plants fed NO3-N was even heavier than those fed NH4-N in some cases”
t0“Potato”