Abstract
In a field nutrient-omission experiment, nitrogen, phosphorus, potassium, sulfur and zinc were sequentially omitted from a 'complete' fertiliser applied to irrigated wheat on an alkaline brown clay soil. Wheat forage and grain yields were recorded for 3 years following this single application. The chemical composition of forage and grain was determined. A second experiment elucidated the response to nitrogen fertiliser after 2 years of wheat or fallow. Deficiencies of phosphorus and nitrogen were evident in the second and subsequent crops. Forage and grain yields were reduced in the absence of these elements as were the respective concentrations of phosphorus and nitrogen in the forage and grain. The omission of zinc fertiliser reduced the concentration of zinc in the grain but not the grain yield. Omitting sulfur led to lower grain yields in the second year. Both sulfur and nitrogen were required to achieve maximum grain nitrogen and sulfur contents. The response to nitrogen fertiliser peaked at 130 kg/ha N after a fallow. After continuous wheat, however, over 200 kg/ha N was required for maximum yields. A positive tillering response to nitrogen accounted for much of this grain yield response. Grain nitrogen contents remained low until 100kg/ha N was applied.
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Claims 11
Claim · model-written summary
Deficiencies of phosphorus and nitrogen were evident in the second and subsequent wheat crops after a single complete fertiliser application.
- Taxon
- Wheat
Triticum aestivumt0 - Outcome
- Deficiencies of phosphorus and nitrogene0
- Qualifier
- second and subsequent cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deficiencies of phosphorus and nitrogen were evident in the second and subsequent crops”
t0“Wheat”
Claim · model-written summary
Wheat forage and grain yields were reduced when phosphorus and nitrogen were omitted.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- absence of these elementse0
- Outcome
- Forage and grain yieldse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Forage and grain yields were reduced in the absence of these elements”
t0“Wheat”
Claim · model-written summary
Concentrations of phosphorus and nitrogen in wheat forage and grain were reduced when phosphorus and nitrogen were omitted.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- absence of these elementse0
- Outcome
- concentrations of phosphorus and nitrogen in the forage and graine0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced in the absence of these elements as were the respective concentrations of phosphorus and nitrogen in the forage and grain”
t0“Wheat”
Claim · model-written summary
Omitting zinc fertiliser reduced the zinc concentration in wheat grain.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- omission of zinc fertilisere0
- Outcome
- concentration of zinc in the graine0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The omission of zinc fertiliser reduced the concentration of zinc in the grain”
t0“Wheat”
Claim · model-written summary
Omitting zinc fertiliser did not reduce wheat grain yield.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- omission of zinc fertilisere0
- Outcome
- grain yielde0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The omission of zinc fertiliser reduced the concentration of zinc in the grain but not the grain yield”
t0“Wheat”
Claim · model-written summary
Omitting sulfur led to lower wheat grain yields in the second year.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Omitting sulfure0
- Outcome
- grain yieldse0
- Direction
- lowere0
- Qualifier
- second yeare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Omitting sulfur led to lower grain yields in the second year”
t0“Wheat”
Claim · model-written summary
Both sulfur and nitrogen were required to achieve maximum grain nitrogen and sulfur contents in wheat.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Both sulfur and nitrogene0
- Outcome
- grain nitrogen and sulfur contentse0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both sulfur and nitrogen were required to achieve maximum grain nitrogen and sulfur contents”
t0“Wheat”
Claim · model-written summary
The wheat response to nitrogen fertiliser peaked at 130 kg/ha N after a fallow.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- nitrogen fertilisere0
- Outcome
- response to nitrogen fertilisere0
- Direction
- peakede0
- Value
- 130 kg/ha Ne0
- Qualifier
- after a fallowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response to nitrogen fertiliser peaked at 130 kg/ha N after a fallow”
t0“Wheat”
Claim · model-written summary
After continuous wheat, over 200 kg/ha N was required for maximum yields.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- over 200 kg/ha Ne0
- Outcome
- maximum yieldse0
- Direction
- maximume0
- Qualifier
- After continuous wheate0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After continuous wheat, however, over 200 kg/ha N was required for maximum yields”
t0“Wheat”
Claim · model-written summary
A positive tillering response to nitrogen accounted for much of the wheat grain yield response to nitrogen.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- nitrogene0
- Outcome
- grain yield responsee0
- Qualifier
- positive tillering responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive tillering response to nitrogen accounted for much of this grain yield response”
t0“Wheat”
Claim · model-written summary
Wheat grain nitrogen contents remained low until 100 kg/ha N was applied.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- 100kg/ha Ne0
- Outcome
- Grain nitrogen contentse0
- Direction
- remained lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain nitrogen contents remained low until 100kg/ha N was applied”
t0“Wheat”
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