Abstract
Nitrogen relationships are discussed for nine grazing‐trial sites throughout New Zealand. Measured clover growth and N fixation were not necessarily closely related, giving substantial seasonal and annual variation in N fixation per unit clover grown. Other factors, including weather and soil characteristics, influenced the extent to which clovers obtained their nitrogen requirements from fixation or by direct uptake of soil N. Annual N fixation in developed lowland pastures was around 184 kg N/ha — less than half the value previously thought to occur. This lower value was consistent with lower clover yields and higher soil N status than recorded in earlier studies. Annual N turnover in the pastures was large, but showed no simple relationships with either N fixation or soil characteristics. Grass yields were relatively insensitive to climatic variation and not simply related to either clover yields or N fixation.
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Claims 6
Claim · model-written summary
Clover growth and nitrogen fixation were not necessarily closely related.
- Outcome
- N fixatione0
TrifoliumNot reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Measured clover growth and N fixation were not necessarily closely related”
Claim · model-written summary
Weather and soil characteristics influenced the nitrogen source used by clovers.
- Outcome
- nitrogen requirements from fixation or by direct uptake of soil Ne0
- Setting
- weather and soil characteristicse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other factors, including weather and soil characteristics, influenced the extent to which clovers obtained their nitrogen requirements from fixation or by direct uptake of soil N”
Claim · model-written summary
Annual nitrogen fixation in developed lowland pastures was about 184 kg N/ha, below half the previously thought value.
Verbatim
e0“Annual N fixation in developed lowland pastures was around 184 kg N/ha — less than half the value previously thought to occur”
Claim · model-written summary
Annual nitrogen turnover was large but had no simple relationship to fixation or soil characteristics.
Verbatim
e0“Annual N turnover in the pastures was large, but showed no simple relationships with either N fixation or soil characteristics”
Claim · model-written summary
Grass yields were relatively insensitive to climate variation.
Verbatim
e0“Grass yields were relatively insensitive to climatic variation”
Claim · model-written summary
Grass yields were not simply related to clover yields or nitrogen fixation.
Verbatim
e0“Grass yields were relatively insensitive to climatic variation and not simply related to either clover yields or N fixation”