Abstract
Abstract A pot experiment was conducted under greenhouse conditions during the summer to determine the effect of the P content and pH of the culture medium on dry matter production, dinitrogen fixation, and critical P concentration in pigeon pea (Cajanus cajan (L) Millsp.) 1. Dry weight in plant parts increased with increasing P application rates. Whole plant weight did not increase significantly above the 0.50 g/pot P application at 92 days while it increased rapidly up to 5.0 g/pot P application at 132 days. At low P levels (0–0.5 g/pot) differences in the whole plant weight with respect to the pH were not significant but at high P levels (2.5 and 5.0 g/pot) the whole plant weight of the plants cultured at pH 6 was slightly higher than that of the plants culture at pH 4. The highest pod weight was achieved at pH 4.2. P application significantly increased the nodule weight and dinitrogen fixation. At a given P level, the acetylene reduction activity tended to be higher in the pH 4 plants than in the pH 6.3. The critical P concentrations on a dry weight basis at 92 days in plant tops, leaves, pods, stems, and roots were 0.15, 0.13, 0.27, 0.05, and 0.09%, respectively. Values were almost similar at pH 4 and 6. However, critical P concentrations were not clearly observed at 132 days.4. At the green maturity stage, P absorbed was mainly distributed to pods. The amount of P translocated from the leaves to the growing pods and grains was higher at low P levels than at high P levels after anthesis.
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Claims 17
Claim · model-written summary
Plant-part dry weight increased with P application.
- Taxon
- pigeon pea
Cajanus cajant0 - Treatment
- P application ratese0
- Outcome
- Dry weight in plant partse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weight in plant parts increased with increasing P application rates.”
t0“pigeon pea”
Claim · model-written summary
At 92 days, whole-plant weight did not increase significantly above 0.50 g/pot P.
- Taxon
- pigeon peaCajanus cajant0
- Treatment
- 0.50 g/pot P applicatione0
- Outcome
- Whole plant weighte0
- Direction
- did not increasee0
- Qualifier
- 92 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Whole plant weight did not increase significantly above the 0.50 g/pot P application at 92 days”
t0“pigeon pea”
Claim · model-written summary
At 132 days, whole-plant weight rose rapidly up to 5.0 g/pot P.
- Taxon
- pigeon peaCajanus cajant0
- Treatment
- 5.0 g/pot P applicatione0
- Outcome
- Whole plant weighte1
- Direction
- increasede0
- Qualifier
- 132 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it increased rapidly up to 5.0 g/pot P application at 132 days.”
e1“Whole plant weight did not increase significantly above the 0.50 g/pot P application at 92 days”
t0“pigeon pea”
Claim · model-written summary
At low P, pH had no significant effect on whole-plant weight.
- Taxon
- pigeon peaCajanus cajant0
- Treatment
- pHe0
- Outcome
- whole plant weighte0
- Qualifier
- low P levels (0–0.5 g/pot)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low P levels (0–0.5 g/pot) differences in the whole plant weight with respect to the pH were not significant”
t0“pigeon pea”
Claim · model-written summary
At high P, pH 6 gave slightly higher whole-plant weight than pH 4.
- Taxon
- pigeon peaCajanus cajant0
- Treatment
- pH 6e0
- Outcome
- whole plant weighte0
- Direction
- slightly highere0
- Qualifier
- high P levels (2.5 and 5.0 g/pot)e0
- Comparator
- pH 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at high P levels (2.5 and 5.0 g/pot) the whole plant weight of the plants cultured at pH 6 was slightly higher than that of the plants culture at pH 4.”
t0“pigeon pea”
Claim · model-written summary
Pod weight was highest at pH 4.2.
- Taxon
- pigeon peaCajanus cajant0
- Treatment
- pH 4.2e0
- Outcome
- pod weighte0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest pod weight was achieved at pH 4.2.”
t0“pigeon pea”
Claim · model-written summary
P significantly increased nodule weight and dinitrogen fixation.
- Taxon
- pigeon peaCajanus cajant0
- Treatment
- P applicatione0
- Outcome
- nodule weight and dinitrogen fixatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P application significantly increased the nodule weight and dinitrogen fixation.”
t0“pigeon pea”
Claim · model-written summary
At given P, acetylene reduction tended to be higher at pH 4 than pH 6.
- Taxon
- pigeon peaCajanus cajant0
- Treatment
- pH 4e0
- Outcome
- acetylene reduction activitye0
- Direction
- highere0
- Qualifier
- given P levele0
- Comparator
- pH 6.3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At a given P level, the acetylene reduction activity tended to be higher in the pH 4 plants than in the pH 6.3.”
t0“pigeon pea”
Claim · model-written summary
At 92 days, critical P concentrations were 0.15% in plant tops.
- Taxon
- pigeon peaCajanus cajant0
- Organ / stage
- plant topse0
- Outcome
- critical P concentrationse0
- Value
- 0.15e0
- Qualifier
- 92 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical P concentrations on a dry weight basis at 92 days in plant tops, leaves, pods, stems, and roots were 0.15, 0.13, 0.27, 0.05, and 0.09%, respectively.”
t0“pigeon pea”
Claim · model-written summary
At 92 days, critical P concentration was 0.13% in leaves.
- Taxon
- pigeon peaCajanus cajant0
- Organ / stage
- leavese0
- Outcome
- critical P concentrationse0
- Value
- 0.13e0
- Qualifier
- 92 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical P concentrations on a dry weight basis at 92 days in plant tops, leaves, pods, stems, and roots were 0.15, 0.13, 0.27, 0.05, and 0.09%, respectively.”
t0“pigeon pea”
Claim · model-written summary
At 92 days, critical P concentration was 0.27% in pods.
- Taxon
- pigeon peaCajanus cajant0
- Organ / stage
- podse0
- Outcome
- critical P concentrationse0
- Value
- 0.27e0
- Qualifier
- 92 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical P concentrations on a dry weight basis at 92 days in plant tops, leaves, pods, stems, and roots were 0.15, 0.13, 0.27, 0.05, and 0.09%, respectively.”
t0“pigeon pea”
Claim · model-written summary
At 92 days, critical P concentration was 0.05% in stems.
- Taxon
- pigeon peaCajanus cajant0
- Organ / stage
- stemse0
- Outcome
- critical P concentrationse0
- Value
- 0.05e0
- Qualifier
- 92 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical P concentrations on a dry weight basis at 92 days in plant tops, leaves, pods, stems, and roots were 0.15, 0.13, 0.27, 0.05, and 0.09%, respectively.”
t0“pigeon pea”
Claim · model-written summary
At 92 days, critical P concentration was 0.09% in roots.
- Taxon
- pigeon peaCajanus cajant0
- Organ / stage
- rootse0
- Outcome
- critical P concentrationse0
- Value
- 0.09%e0
- Qualifier
- 92 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical P concentrations on a dry weight basis at 92 days in plant tops, leaves, pods, stems, and roots were 0.15, 0.13, 0.27, 0.05, and 0.09%, respectively.”
t0“pigeon pea”
Claim · model-written summary
Critical P concentrations were nearly similar at pH 4 and 6.
- Taxon
- pigeon peaCajanus cajant0
- Outcome
- Valuese0
- Direction
- almost similare0
- Comparator
- pH 4 and 6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Values were almost similar at pH 4 and 6.”
t0“pigeon pea”
Claim · model-written summary
Critical P concentrations were not clearly observed at 132 days.
- Taxon
- pigeon peaCajanus cajant0
- Outcome
- critical P concentrationse0
- Qualifier
- 132 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“critical P concentrations were not clearly observed at 132 days.”
t0“pigeon pea”
Claim · model-written summary
At green maturity, absorbed P was mainly distributed to pods.
- Taxon
- pigeon peaCajanus cajant0
- Organ / stage
- podse0
- Outcome
- P absorbede0
- Qualifier
- green maturity stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the green maturity stage, P absorbed was mainly distributed to pods.”
t0“pigeon pea”
Claim · model-written summary
After anthesis, leaf-to-pod and grain P translocation was higher at low than high P.
- Taxon
- pigeon peaCajanus cajant0
- Treatment
- low P levelse0
- Outcome
- P translocated from the leaves to the growing pods and grainse0
- Direction
- highere0
- Qualifier
- after anthesise0
- Comparator
- high P levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of P translocated from the leaves to the growing pods and grains was higher at low P levels than at high P levels after anthesis.”
t0“pigeon pea”
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