Abstract
Abstract Oxalate occurs naturally in forage species, but excess levels of soluble oxalate adversely affect their nutritional quality as animal feed. Although induction of oxalate in plants has been associated with nitrate application, relatively little is known about oxalate in forage grasses. In the present study, we investigated oxalate accumulation and mineral uptake by napiergrass ( Pennisetum purpureum , cv. dwarf‐late) cultured in complete nutrient solution containing either solely nitrate or mainly ammonium as the main form of nitrogen. Total (shoot and root) yield of plants did not differ significantly between the nitrate and ammonium treatments. By contrast, the nitrogen form significantly affected oxalate accumulation and mineral uptake by plants. Nitrate application resulted in higher concentrations of soluble and insoluble oxalates in the shoot and soluble oxalate in the root than ammonium application. Nitrate application also resulted in higher concentrations of sodium and calcium in the shoot, and higher concentrations of sodium, calcium and magnesium in the root than ammonium application. The results suggest that the application of nitrate fertilizer as the sole source of nitrogen should be avoided in the cultivation of oxalate‐rich forages, though further studies are needed under field conditions.
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Claims 6
Claim · model-written summary
Total yield of napiergrass did not differ significantly between nitrate and ammonium nitrogen treatments.
- Taxon
- napiergrass
.jpg?width=60)
Cenchrus purpureust0 - Treatment
- nitratee2
- Outcome
- Total (shoot and root) yielde2
- Direction
- did not differ significantlye2
- Comparator
- ammoniume2
- Setting
- complete nutrient solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“napiergrass (Pennisetum purpureum)”
e1“cultured in complete nutrient solution containing either solely nitrate or mainly ammonium as the main form of nitrogen”
e2“Total (shoot and root) yield of plants did not differ significantly between the nitrate and ammonium treatments”
Claim · model-written summary
Nitrate application gave higher soluble and insoluble oxalate concentrations in napiergrass shoots than ammonium application.
- Taxon
- napiergrassCenchrus purpureust0
- Organ / stage
- shoote3
- Treatment
- Nitrate applicatione3
- Outcome
- concentrations of soluble and insoluble oxalatese3
- Direction
- highere3
- Comparator
- ammonium applicatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“napiergrass (Pennisetum purpureum)”
e3“Nitrate application resulted in higher concentrations of soluble and insoluble oxalates in the shoot and soluble oxalate in the root than ammonium application”
Claim · model-written summary
Nitrate application gave higher soluble oxalate concentration in napiergrass roots than ammonium application.
- Taxon
- napiergrassCenchrus purpureust0
- Organ / stage
- roote3
- Treatment
- Nitrate applicatione3
- Outcome
- soluble oxalatee3
- Direction
- highere3
- Comparator
- ammonium applicatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“napiergrass (Pennisetum purpureum)”
e3“Nitrate application resulted in higher concentrations of soluble and insoluble oxalates in the shoot and soluble oxalate in the root than ammonium application”
Claim · model-written summary
Nitrate application gave higher sodium and calcium concentrations in napiergrass shoots than ammonium application.
- Taxon
- napiergrassCenchrus purpureust0
- Organ / stage
- shoote4
- Treatment
- Nitrate applicatione4
- Outcome
- concentrations of sodium and calciume4
- Direction
- highere4
- Comparator
- ammonium applicatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“napiergrass (Pennisetum purpureum)”
e4“Nitrate application also resulted in higher concentrations of sodium and calcium in the shoot, and higher concentrations of sodium, calcium and magnesium in the root than ammonium application”
Claim · model-written summary
Nitrate application gave higher sodium, calcium and magnesium concentrations in napiergrass roots than ammonium application.
- Taxon
- napiergrassCenchrus purpureust0
- Organ / stage
- roote4
- Treatment
- Nitrate applicatione4
- Outcome
- concentrations of sodium, calcium and magnesiume4
- Direction
- highere4
- Comparator
- ammonium applicatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“napiergrass (Pennisetum purpureum)”
e4“Nitrate application also resulted in higher concentrations of sodium and calcium in the shoot, and higher concentrations of sodium, calcium and magnesium in the root than ammonium application”
Claim · model-written summary
Nitrate fertilizer as the sole nitrogen source should be avoided in cultivating oxalate-rich forages such as napiergrass.
- Taxon
- napiergrassCenchrus purpureust0
- Outcome
- application of nitrate fertilizer as the sole source of nitrogene5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“napiergrass (Pennisetum purpureum)”
e5“the application of nitrate fertilizer as the sole source of nitrogen should be avoided in the cultivation of oxalate‐rich forages”
The same questions in other papers
nitrogen · molecular: metabolites · Cenchrus purpureus (elephant grass)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
nitrogen · yield · Cenchrus purpureus (elephant grass)Positive and negative results
2 papers in the same direction as this paper · 12 reporting no difference from an alternative
- positive
- positive
- positive
11 papers more in this group
See all 15 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.