Abstract
To compare the growth performance of Brassica in a phosphorus (P) stress environment and response to added P, six Brassica cultivars were grown in pots for 49 days after sowing, using a soil low in P [sodium bicarbonate (NaHCO3)–extractable P = 3.97 mg kg−1, Mehlich III–extractable P = 6.13 mg kg−1] with (+P = 60 mg P kg−1 soil) or without P addition (0P). Phosphorus‐stress markedly reduced biomass accumulation and P uptake by roots and shoots. However, root–shoot ratio remained unaffected, implying that relative partitioning of biomass into roots and shoots had little role to play in shoot dry matter (SDM) production by cultivars. Biomass correlated significantly (P < 0.01) with total P uptake. Under P stress, the cultivars that produced greater root biomass were able to accumulate more total P content (r = 0.95**), which in turn was related positively to SDM and total biomass (r > 0.89**) and negatively to P‐stress factor (r = −0.91**). There was no correlation between P efficiency (PE) (relative shoot growth) and plant P, but PE showed a very significant correlation with shoot P content and SDM. Wide differences in growth and better performance of cultivars such as ‘Brown Raya’ and ‘Con‐1’ under P stress encouraged screening of more germplasm, especially in the field, to identify P‐tolerant cultivars. In another study, potential relative agronomic effectiveness (RAE) of sparingly soluble P sources was investigated by growing two contrasting cultivars. The P sources incorporated into soil at 0, 10, 25, 50, and 100 mg P Kg−1 were (i) powdered Jordan rock P (RP), (ii) triple superphosphate (TSP), (iii) powdered low‐grade TSP [TSP(PLG)], (iv) a mixture of RP + TSP compacted into pellets at 50:50 P ratio [RP + TSP(PelC)], and (v) a mixture of powdered RP + TSP at 50:50 P ratio [RP + TSP(PM)]. The RP was low in RAE and only 5 and 29% as effective as TSP in producing dry matter (DM) of P‐sensitive ‘B.S.A.’ and P‐tolerant ‘Brown Raya’ cultivars, respectively. There were no significant differences between TSP and RP + TSP(PelC) in DM yield of ‘Brown Raya,’ whereas, in the case of ‘B.S.A.’ RP + TSP(PM) was significantly less effective than RP + TSP(PelC) compared with TSP. Combined utilization of superior genome and P sources [such as TSP(PLG) and RP + TSP(PelC)] produced from low‐grade RP (that cannot be used either for direct application or acidulated P fertilizers) can be used as an alternative strategy for sustainable crop production, especially in resource‐poor environments. Further field trials at the level of cropping systems are needed.
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Claims 14
Claim · model-written summary
Phosphorus stress reduced Brassica biomass accumulation.
BrassicaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus‐stress markedly reduced biomass accumulation and P uptake by roots and shoots”
t0“BrassicaCultivars”
Claim · model-written summary
Phosphorus stress reduced phosphorus uptake by Brassica roots and shoots.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus‐stress markedly reduced biomass accumulation and P uptake by roots and shoots”
t0“BrassicaCultivars”
Claim · model-written summary
The Brassica root–shoot ratio was unaffected by phosphorus stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root–shoot ratio remained unaffected”
e1“Under P stress”
t0“BrassicaCultivars”
Claim · model-written summary
Biomass and total phosphorus uptake were significantly correlated in Brassica.
Not reportedCompoundOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biomass correlated significantly (P < 0.01) with total P uptake”
t0“BrassicaCultivars”
Claim · model-written summary
Under phosphorus stress, Brassica cultivars with greater root biomass accumulated more total phosphorus.
- Organ / stage
- roote0
- Outcome
- total P contente0
- Direction
- moree0
- Value
- r = 0.95**e0
- Comparator
- greater root biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under P stress, the cultivars that produced greater root biomass were able to accumulate more total P content (r = 0.95**)”
t0“BrassicaCultivars”
Claim · model-written summary
Total phosphorus content was positively related to shoot dry matter and total biomass in Brassica.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total P content (r = 0.95**), which in turn was related positively to SDM and total biomass (r > 0.89**)”
t0“BrassicaCultivars”
Claim · model-written summary
Total phosphorus content was negatively related to the phosphorus stress factor in Brassica.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negatively to P‐stress factor (r = −0.91**)”
e1“total P content (r = 0.95**)”
t0“BrassicaCultivars”
Claim · model-written summary
Phosphorus efficiency was not correlated with plant phosphorus in Brassica.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no correlation between P efficiency (PE) (relative shoot growth) and plant P”
t0“BrassicaCultivars”
Claim · model-written summary
Phosphorus efficiency correlated very significantly with shoot phosphorus content and shoot dry matter in Brassica.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PE showed a very significant correlation with shoot P content and SDM”
t0“BrassicaCultivars”
Claim · model-written summary
Brown Raya and Con‐1 performed better under phosphorus stress than other Brassica cultivars.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“better performance of cultivars such as ‘Brown Raya’ and ‘Con‐1’ under P stress”
t0“BrassicaCultivars”
Claim · model-written summary
Rock phosphate was 5% as effective as triple superphosphate for dry matter production of B.S.A.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The RP was low in RAE and only 5 and 29% as effective as TSP in producing dry matter (DM) of P‐sensitive ‘B.S.A.’ and P‐tolerant ‘Brown Raya’ cultivars, respectively”
t0“BrassicaCultivars”
Claim · model-written summary
Rock phosphate was 29% as effective as triple superphosphate for dry matter production of Brown Raya.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The RP was low in RAE and only 5 and 29% as effective as TSP in producing dry matter (DM) of P‐sensitive ‘B.S.A.’ and P‐tolerant ‘Brown Raya’ cultivars, respectively”
t0“BrassicaCultivars”
Claim · model-written summary
Powdered RP plus TSP was significantly less effective than pelleted RP plus TSP for B.S.A.
- Material
- ‘B.S.A.’e0
- Treatment
- RP + TSP(PM)e0
- Outcome
- less effectivee0
- Direction
- less effectivee0
- Comparator
- RP + TSP(PelC)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the case of ‘B.S.A.’ RP + TSP(PM) was significantly less effective than RP + TSP(PelC) compared with TSP”
t0“BrassicaCultivars”
Claim · model-written summary
The authors recommend combining superior cultivars with phosphorus sources made from low grade rock phosphate for sustainable production.
- Outcome
- Combined utilization of superior genome and P sourcese0
- Qualifier
- especially in resource‐poor environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combined utilization of superior genome and P sources [such as TSP(PLG) and RP + TSP(PelC)] produced from low‐grade RP (that cannot be used either for direct application or acidulated P fertilizers) can be used as an alternative strategy for sustainable crop production, especially in resource‐poor environments”
t0“BrassicaCultivars”
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See all 6 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.