Abstract
The development of rooted cuttings of the Washington Navel orange through two cycles of growth is described, and the effects of phosphorus nutrition and the relative value of nitrate and ammonium as sources of nitrogen are assessed. Alternation of shoot and root development over the period of the experiment was observed. There appeared to be no build up of dry matter reserves in the plant tops before new shoot initiation, but rather a rhythmic distribution between root and shoot of the dry matter assimilated. The initiation of new shoots was followed by a rapid increase in leaf area, by an increase in dry matter per unit leaf area, by a rapid increase in whole plant dry weight, and by higher growth rates. In this latter respect, the behaviour of this woody perennial contrasts with the normal growth pattern of annuals, where the growth indices tend to fall with time. Phosphorus shortage delayed plant development, so leading to lower dry weight values in all plant parts. No differences in growth due to nitrate or ammonium as sources of nitrogen could be detected.
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Claims 10
Claim · model-written summary
Orange cuttings alternated shoot and root development.
Verbatim
t0“Washington navel orange”
e0“Alternation of shoot and root development over the period of the experiment was observed”
Claim · model-written summary
Plant tops did not accumulate dry matter reserves before new shoot initiation.
Verbatim
t0“Washington navel orange”
e0“There appeared to be no build up of dry matter reserves in the plant tops before new shoot initiation”
Claim · model-written summary
Assimilated dry matter was distributed rhythmically between root and shoot.
Verbatim
t0“Washington navel orange”
e0“a rhythmic distribution between root and shoot of the dry matter assimilated”
Claim · model-written summary
New shoot initiation was followed by rapid leaf area increase.
Verbatim
t0“Washington navel orange”
e0“The initiation of new shoots was followed by a rapid increase in leaf area”
Claim · model-written summary
New shoot initiation was followed by increased dry matter per unit leaf area.
Verbatim
t0“Washington navel orange”
e0“by an increase in dry matter per unit leaf area”
Claim · model-written summary
New shoot initiation was followed by a rapid increase in whole plant dry weight.
Verbatim
t0“Washington navel orange”
e0“by a rapid increase in whole plant dry weight”
Claim · model-written summary
New shoot initiation was followed by higher growth rates.
Verbatim
t0“Washington navel orange”
e0“by higher growth rates”
Claim · model-written summary
Phosphorus shortage delayed orange plant development.
- Taxon
- Washington navel oranget0
- Treatment
- Phosphorus shortagee0
- Outcome
- plant developmente0
- Direction
- delayede0
Not reportedComparator
Verbatim
t0“Washington navel orange”
e0“Phosphorus shortage delayed plant development, so leading to lower dry weight values in all plant parts”
Claim · model-written summary
Phosphorus shortage lowered dry weight in all orange plant parts.
- Taxon
- Washington navel oranget0
- Treatment
- Phosphorus shortagee0
- Outcome
- dry weight values in all plant partse0
- Direction
- lowere0
Not reportedComparator
Verbatim
t0“Washington navel orange”
e0“Phosphorus shortage delayed plant development, so leading to lower dry weight values in all plant parts”
Claim · model-written summary
Growth did not differ detectably between nitrate and ammonium nitrogen sources.
Verbatim
t0“Washington navel orange”
e0“No differences in growth due to nitrate or ammonium as sources of nitrogen could be detected”
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