Phosphorus Use Efficiency for Cucumber (Cucumis Satnus L.) Grown on Acid Soils
Phosphorus (P) use efficiency for cucumber grown on acid soils was studied. The objectives of this experiment were: (i) to screen the solubility of three phosphate rocks in acid soils with the aim of selecting one phosphate rock (PR) with the best P and calcium (Ca) solubility in acid soils - a l...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2003
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10634/1/FP_2003_3.pdf |
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| Summary: | Phosphorus (P) use efficiency for cucumber grown on acid soils was
studied. The objectives of this experiment were: (i) to screen the solubility of
three phosphate rocks in acid soils with the aim of selecting one phosphate rock
(PR) with the best P and calcium (Ca) solubility in acid soils - a laboratory
study, (ii) to determine the most economical P source, critical P level, and the
relationship between P uptake (Ps) and phosphorus dissolution from PR (PDP)
or Pb/P - green house study, and (iii) to improve upon P availability in an
acid soil cultivated with cucumber influenced by mycorrhiza (VAM) inoculation,
organic matter (OM) amendment and P rate - field study. Results of the
experiment indicated that in a closed incubation system, dissolution of Indonesian phosphate rock (IPR) (30.20 to 100.00%) was the highest followed
by Gafsa phosphate rock (GPR) (17.00 to 68.80%) and then China phosphate
rock (CPR) (19.80 to 53.80%). Three major factors which may affect the PR
dissolution were identified: (i) soil texture (STF), (ii) soil acidity (SAF) and (iii)
fertilizer (FF). Soil texture (clay, silt and sand contents) and P retention capacity
showed the highest magnitude (54%) of the factor effect on P dissolution. In a
green house, there was significant difference between soils and P levels with
regards to total plant dry matter yield (DMY), leaf area, soil N, K and Ca
nutrients, and N, K and Ca uptake by cucumber at three harvests extending
from 14 to 42 days. The IPR (RAE = 177.10%) and GPR (RAE = 145.50%)
were superior to triple superphosphate (TSP). On the soils with high P retention
capacity (> 50%), the supply of P from both IPR and GPR on cucumber were
much cost effective than TSP, with relative economic effectiveness (REE)
values of 495.50% and 318.60% for IPR and GPR, respectively. For GPR, there
was a positive correlation between P uptake (L\Ps) and P dissolution (L\P) as
well as P uptake (L\Ps), and P availability (L\Pb). Similar observation was made
for IPR and not TSP. There was a close relationship between residual P
determined by Pb method and P uptake (Ps) by cucumber at 28 and 42 days
with correlation coefficients varying from 0.76 to 0.97 for GPR, IPR and TSP in
the three acid soils. |
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