Abstract
SUMMARY Physiological problems in some Fife dairy herds were thought to be associated with mineral imbalance in grass cut for silage. Consequently trials at two sites were conducted to study the effects of three levels of nitrogen and phosphorus and two levels of potassium on yield and composition of pasture cut for silage. Nitrogen increased yield of herbage and reduced its clover content whereas phosphorus and potassium had little effect on yield or clover content. Herbage clover content and calcium concentration declined over the period of the experiment. Mean concentrations of calcium, magnesium and phosphorus were 5·8, 1·7 and 3·4 g/kg respectively. Concentrations of these minerals varied more with time of cutting and with season than with level of applied phosphorus and potassium. Nitrogen tended to reduce calcium concentration in mixed herbage and to increase magnesium concentration in the grass component; it did not affect herbage phosphorus concentrations, but narrowed the calcium-phosphorus ratio in the second cuts. Applied phosphorus increased herbage phosphorus concentration only at the site with the lower soil phosphorus status. Potassium tended to reduce magnesium concentration in clover and, at one site, in mixed herbage; it also tended to reduce herbage phosphorus concentrations in second cuts. Mineral uptake was increased by applied nitrogen. Mean annual uptake of calcium magnesium and phosphorus was 34, 10 and 20 kg/ha respectively. The effects of treatments on concentration and balance of these minerals are discussed in relation to ruminant requirements and maintenance of suitable levels of the minerals in the soil. It is concluded that normal applications of NPK fertilizer are not detrimental to satisfactory mineral balance in pasture.
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Claims 20
Claim · model-written summary
Nitrogen increased herbage yield.
Not reportedComparator
Verbatim
e0“Nitrogen increased yield of herbage and reduced its clover content”
Claim · model-written summary
Nitrogen reduced herbage clover content.
Not reportedComparator
Verbatim
e0“Nitrogen increased yield of herbage and reduced its clover content”
e1“clover content whereas phosphorus”
Claim · model-written summary
Phosphorus had little effect on herbage yield or clover content.
TrifoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphorus and potassium had little effect on yield or clover content.”
Claim · model-written summary
Potassium had little effect on herbage yield or clover content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphorus and potassium had little effect on yield or clover content.”
Claim · model-written summary
Herbage clover content declined over the experiment.
Verbatim
e0“Herbage clover content and calcium concentration declined over the period of the experiment.”
Claim · model-written summary
Herbage calcium concentration declined over the experiment.
Verbatim
e0“Herbage clover content and calcium concentration declined over the period of the experiment.”
Claim · model-written summary
Mean herbage calcium concentration was 5·8 g/kg.
Verbatim
e0“Mean concentrations of calcium, magnesium and phosphorus were 5·8, 1·7 and 3·4 g/kg respectively.”
e1“Herbage clover content”
Claim · model-written summary
Mean herbage magnesium concentration was 1·7 g/kg.
Verbatim
e0“Mean concentrations of calcium, magnesium and phosphorus were 5·8, 1·7 and 3·4 g/kg respectively.”
e1“Herbage clover content”
Claim · model-written summary
Mean herbage phosphorus concentration was 3·4 g/kg.
Verbatim
e0“Mean concentrations of calcium, magnesium and phosphorus were 5·8, 1·7 and 3·4 g/kg respectively.”
e1“Herbage clover content”
Claim · model-written summary
Mineral concentrations varied more with cutting time and season than with applied phosphorus and potassium.
Verbatim
e0“Concentrations of these minerals varied more with time of cutting and with season than with level of applied phosphorus and potassium.”
e1“Herbage clover content”
Claim · model-written summary
Nitrogen tended to reduce calcium concentration in mixed herbage.
- Taxon
- mixed herbagee0
- Treatment
- Nitrogene0
- Outcome
- calcium concentratione0
- Direction
- reducee0
- Qualifier
- tended toe0
Not reportedComparator
Verbatim
e0“Nitrogen tended to reduce calcium concentration in mixed herbage”
Claim · model-written summary
Nitrogen tended to increase magnesium concentration in grass.
- Taxon
- grasse0
- Treatment
- Nitrogene1
- Outcome
- magnesium concentratione0
- Direction
- increasee0
- Qualifier
- tended toe1
Not reportedComparator
Verbatim
e0“increase magnesium concentration in the grass component”
e1“Nitrogen tended to reduce calcium concentration”
Claim · model-written summary
Nitrogen did not affect herbage phosphorus concentration.
- Taxon
- herbagee0
- Treatment
- Nitrogene1
- Outcome
- herbage phosphorus concentrationse0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
e0“it did not affect herbage phosphorus concentrations”
e1“Nitrogen tended to reduce calcium concentration”
Claim · model-written summary
Nitrogen narrowed the calcium-phosphorus ratio in second cuts.
- Taxon
- pasturet0
- Treatment
- Nitrogene1
- Outcome
- calcium-phosphorus ratioe0
- Direction
- narrowede0
- Qualifier
- second cutse0
Not reportedComparator
Verbatim
e0“narrowed the calcium-phosphorus ratio in the second cuts.”
e1“Nitrogen tended to reduce calcium concentration”
t0“pasture cut for silage”
Claim · model-written summary
Applied phosphorus increased herbage phosphorus concentration only where soil phosphorus was lower.
- Taxon
- herbagee0
- Treatment
- Applied phosphoruse0
- Outcome
- herbage phosphorus concentratione0
- Direction
- increasede0
- Qualifier
- only at the site with the lower soil phosphorus statuse0
Not reportedComparator
Verbatim
e0“Applied phosphorus increased herbage phosphorus concentration only at the site with the lower soil phosphorus status.”
Claim · model-written summary
Potassium tended to reduce magnesium concentration in clover.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium tended to reduce magnesium concentration in clover”
Claim · model-written summary
Potassium tended to reduce magnesium concentration in mixed herbage at one site.
- Taxon
- mixed herbagee0
- Treatment
- Potassiume0
- Outcome
- magnesium concentratione0
- Direction
- reducee0
- Qualifier
- at one sitee0
Not reportedComparator
Verbatim
e0“Potassium tended to reduce magnesium concentration in clover and, at one site, in mixed herbage”
Claim · model-written summary
Potassium tended to reduce herbage phosphorus concentration in second cuts.
- Taxon
- herbagee0
- Treatment
- Potassiume1
- Outcome
- herbage phosphorus concentrationse0
- Direction
- reducee0
- Qualifier
- second cutse0
Not reportedComparator
Verbatim
e0“it also tended to reduce herbage phosphorus concentrations in second cuts.”
e1“Potassium tended to reduce magnesium concentration”
Claim · model-written summary
Nitrogen increased mineral uptake by pasture.
Not reportedComparator
Verbatim
e0“Mineral uptake was increased by applied nitrogen.”
t0“pasture cut for silage”
Claim · model-written summary
The authors conclude normal NPK applications do not impair pasture mineral balance.
Verbatim
e0“It is concluded that normal applications of NPK fertilizer are not detrimental to satisfactory mineral balance in pasture.”
The same questions in other papers
potassium · yield · TrifoliumPositive and negative results
2 in the opposite direction
- positive
- positive
phosphorus · yield · TrifoliumPositive and negative results
2 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- positive
12 papers more in this group
See all 16 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.