Abstract
Abstract Four nutrient culture experiments were conducted to determine the responses of potatoes (Solanum tuberosum L.) to varied solution pH levels with nitrogen supplied as NO3 −, NH4 +, and mixed NO3 −/NH4 + (1/1) at the same total N concentration of 4 mM. In the first and second experiments, pH levels were maintained at 3.5, 4, 5, 6, 7, and 7.5 with separate NO3 − and NH4 +. In the third experiment, pH levels were provided at 4, 4.5, 5, 6, 6.5, 7 with mixed NO3 −/NH4 +. In the fourth experiment, pH levels of 5 and 6 were maintained in combination with NO3 −, NH4 +, and mixed NO3 −/NH4 +. Plants were grown in trays filled with quartz gravel and fed with non‐recirculating nutrient solutions at the flow rate of 4 ml min−1. The plants were grown for 28 days after transplanting of tissue culture plantlets. With mixed nitrogen, plant growth as total dry weight, leaf area and tuber number per plant was essentially similar at pH 4.5 to 7, and decreased only at pH 4. With either nitrogen form alone, however, plant growth peaked at a particular pH level, pH 5 with NO3 − and pH 6 with NH4 +, and decreased at other pH levels. The shoot concentrations of N, K, Ca, Mg, and P changed little from pH 4 to 7 with mixed nitrogen whereas they varied significantly between pH 4 and 7 with either NO3 − or NH4 +. The interacting effects of pH levels and nitrogen forms on plant growth and tissue mineral composition were essentially duplicated when pH 5 and 6 were maintained with NO3 −, NH4 +, and mixed NO3 −/NH4 + in a combined experiment. The data in this paper indicate that mixed nitrogen forms can broaden the useful pH range and enhance growth for potato plants as compared to a single nitrogen form.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
With mixed nitrogen, potato dry weight, leaf area and tuber number were similar from pH 4.5 to 7.
- Taxon
- potatoes
Solanum tuberosumt0 - Treatment
- mixed nitrogene0
- Outcome
- total dry weight, leaf area and tuber number per plante0
- Direction
- essentially similare0
- Comparator
- pH 4.5 to 7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With mixed nitrogen, plant growth as total dry weight, leaf area and tuber number per plant was essentially similar at pH 4.5 to 7”
t0“potatoes”
Claim · model-written summary
With mixed nitrogen, potato growth decreased only at pH 4.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- mixed nitrogene0
- Outcome
- plant growthe0
- Direction
- decreasede0
- Qualifier
- pH 4e0
- Comparator
- pH 4.5 to 7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With mixed nitrogen, plant growth as total dry weight, leaf area and tuber number per plant was essentially similar at pH 4.5 to 7, and decreased only at pH 4”
t0“potatoes”
Claim · model-written summary
With nitrate alone, potato growth peaked at pH 5 and decreased at other pH levels.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- NO3 −e0
- Outcome
- plant growthe0
- Direction
- peakede0
- Qualifier
- pH 5e0
- Comparator
- other pH levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant growth peaked at a particular pH level, pH 5 with NO3 − and pH 6 with NH4 +, and decreased at other pH levels”
t0“potatoes”
Claim · model-written summary
With ammonium alone, potato growth peaked at pH 6 and decreased at other pH levels.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- NH4 +e0
- Outcome
- plant growthe0
- Direction
- peakede0
- Qualifier
- pH 6e0
- Comparator
- other pH levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant growth peaked at a particular pH level, pH 5 with NO3 − and pH 6 with NH4 +, and decreased at other pH levels”
t0“potatoes”
Claim · model-written summary
With mixed nitrogen, shoot N, K and Ca concentrations changed little over pH 4 to 7.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- mixed nitrogene0
- Outcome
- shoot concentrations of N, K, Cae0
- Direction
- changed littlee0
- Comparator
- pH 4 to 7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot concentrations of N, K, Ca, Mg, and P changed little from pH 4 to 7 with mixed nitrogen”
t0“potatoes”
Claim · model-written summary
With mixed nitrogen, shoot Mg and P concentrations changed little over pH 4 to 7.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- mixed nitrogene0
- Outcome
- Mg, and Pe0
- Direction
- changed littlee0
- Comparator
- pH 4 to 7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot concentrations of N, K, Ca, Mg, and P changed little from pH 4 to 7 with mixed nitrogen”
t0“potatoes”
Claim · model-written summary
With either single nitrogen form, shoot mineral concentrations varied significantly between pH 4 and 7.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- either NO3 − or NH4 +e0
- Outcome
- varied significantlye0
- Comparator
- pH 4 and 7e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they varied significantly between pH 4 and 7 with either NO3 − or NH4 +”
t0“potatoes”
Claim · model-written summary
Combined pH 5 and 6 experiments duplicated the growth and mineral composition interaction.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- pH 5 and 6e0
- Outcome
- plant growth and tissue mineral compositione0
- Direction
- essentially duplicatede0
- Comparator
- NO3 −, NH4 +, and mixed NO3 −/NH4 +e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interacting effects of pH levels and nitrogen forms on plant growth and tissue mineral composition were essentially duplicated when pH 5 and 6 were maintained with NO3 −, NH4 +, and mixed NO3 −/NH4 + in a combined experiment”
t0“potatoes”
Claim · model-written summary
Mixed nitrogen broadens the useful pH range and enhances potato growth relative to a single form.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- mixed nitrogen formse0
- Outcome
- useful pH range and enhance growthe0
- Direction
- broadene0
- Comparator
- a single nitrogen forme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mixed nitrogen forms can broaden the useful pH range and enhance growth for potato plants as compared to a single nitrogen form”
t0“potatoes”
The same questions in other papers
nitrogen · yield · Solanum tuberosum (potato)Results differ
22 papers in the same direction as this paper · 109 reporting no difference from an alternative
- positive
- positive
- positive
128 papers more in this group
See all 132 papers →nitrogen · growth · Solanum tuberosum (potato)Positive and negative results
37 papers in the same direction as this paper · 13 in the opposite direction
- positive
- negative
- negative
47 papers more in this group
See all 51 papers →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.