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Titolo:
Comparison of the agronomic effectiveness of a phosphate rock and triple superphosphate as phosphate fertilisers for tea (Camellia sinensis L.) on a strongly acidic Ultisol
Autore:
Zoysa, AKN; Loganathan, P; Hedley, MJ;
Indirizzi:
Massey Univ, Inst Nat Resources, Fertilizer & Lime Res Ctr, Palmerston North, New Zealand Massey Univ Palmerston North New Zealand Palmerston North, New Zealand
Titolo Testata:
NUTRIENT CYCLING IN AGROECOSYSTEMS
fascicolo: 2, volume: 59, anno: 2001,
pagine: 95 - 105
SICI:
1385-1314(2001)59:2<95:COTAEO>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOSPHORUS; SOILS; RHIZOSPHERE; FORMS; ACIDIFICATION;
Keywords:
agronomic effectiveness; phosphate fertilisers; soil phosphate fractions; phosphate rock; tea;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Loganathan, P Massey Univ, Inst Nat Resources, Fertilizer & Lime Res Ctr, Palmerston North, New Zealand Massey Univ Palmerston North New Zealand rth, New Zealand
Citazione:
A.K.N. Zoysa et al., "Comparison of the agronomic effectiveness of a phosphate rock and triple superphosphate as phosphate fertilisers for tea (Camellia sinensis L.) on a strongly acidic Ultisol", NUTR CYCL A, 59(2), 2001, pp. 95-105

Abstract

Phosphorus deficiency is a major problem affecting tea production in the highly weathered acid soils of humid and sub-humid tropics which are known to have high P fixing capacities. As many of these soils are strongly acidicand receive high rainfall, low-cost phosphate rock (PR) may effectively supply the plant P needs and limited preliminary experiments suggest this is so. A long-term glasshouse trial was conducted on 8-month old tea seedlingsto compare the agronomic effectiveness of a locally available PR (Eppawalaphosphate rock, EPR) with triple superphosphate (TSP) applied to a strongly acidic (pH water 4.55) marginally P deficient Rhodustult from Sri Lanka at six rates ranging from 10 to 60 kg P ha(-1). The results showed that TSP or EPR fertiliser at a rate as low as 10 or 20 kg P ha(-1) was sufficient to obtain maximun tea yield. The agronomic effectiveness of EPR was equal tothat of TSP at the 5- and 10-month samplings. The concentration of soil P extracted by a cation-anion exchange resin membrane (resin-P) was higher inthe TSP treated soil at 5 months due to its greater solubility but at 10 months, the EPR produced higher resin-P due to its increased dissolution over time. In the presence of tea plants, 52% of P from the EPR applied at therate of 10 kg ha(-)1, was dissolved at 5 months compared to 75% of dissolution at the 10-month sampling. In the absence of plants, the corresponding dissolution figures were 40% at 5 months and 55% at 10 months. The concentration of inorganic P extracted by 0.1 M NaOH (NaOH-P i) (loosely characterising Fe + Al bound P) was significantly higher in the TSP treated soil and concentration of P extracted by 0.5 M H2SO4 (Ca bound P) was higher in the EPR treated soil. The results suggest that the low-cost, locally available EPR may be used profitably as a maintenace P fertiliser for tea plantationsin moderately P deficient soils, which need to be confirmed by field studies.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 08:31:57