Comparison of phosphate rock and triple superphosphate on a phosphorus‐deficient Kenyan soil

Mutuo, Patrick K.; Smithson, Paul; Buresh, R. J.; Okalebo, Robert

doi:10.1080/00103629909370270

Cited by 29 publications

(12 citation statements)

References 23 publications

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“…Tithonia can therefore be used as a substitute for urea in integrated soil fertility management systems. The RAE of MPR in our study was generally high and is consistent with other studies in the area [4,25] that have concluded that MPR is a reactive PR and is therefore suitable for direct application. The better performance of MPR at Khwisero than Nyabeda is consistent with the available P being higher at Khwisero due to higher dissolution of MPR occasioned by the lower pH at this site as earlier discussed.…”

Section: Discussionsupporting

confidence: 80%

The Effect of Minjingu Phosphate Rock and Triple Superphosphate on Soil Phosphorus Fractions and Maize Yield in Western Kenya

Nyambati

Opala

2014

ISRN Soil Science

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We tested the effects of triple superphosphate (TSP) and Minjingu phosphate rock (MPR), when applied at phosphorus (P) rates of 50 or 250 kg P ha −1 in a factorial combination with urea or Tithonia diversifolia green manure as nitrogen sources, on P availability and maize yields for two seasons at Nyabeda and Khwisero in Kenya. Phosphorus availability was determined by the Olsen method or sequential fractionation. There was no significant difference in Olsen P as influenced by TSP and MPR at 50 kg P ha −1 irrespective of the N source at both sites in both seasons. However, at 250 kg P ha −1 , TSP gave significantly higher Olsen P than MPR. The labile P fractions generally followed the same trend as the Olsen P. Maize yields increased with increasing amount of P applied. Generally, there was no significant difference between TSP and MPR on maize yields irrespective of the N source. The Olsen-P, Resin-P, and sodium bicarbonate inorganic P correlated well with maize yields when TSP was used but the correlations between these P tests and maize yields for MPR were not consistent and therefore their use on soils treated with MPR should be exercised with caution.

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Section: Discussionsupporting

confidence: 80%

The Effect of Minjingu Phosphate Rock and Triple Superphosphate on Soil Phosphorus Fractions and Maize Yield in Western Kenya

Nyambati

Opala

2014

ISRN Soil Science

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“…The S was introduced to provide an acidic environment to enhance the dissolution of PR (Bromfield, 1975). TSP at different rates was not included because past work had shown that TSP gave comparable yields to MPR (Okalebo and Woomer, 1994;Mutuo et al, 1999). The MPR used is a biogenic type originating from Arusha, Tanzania with 13 % total P and 3 % neutral ammonium-citrate-soluble P contents (Van Kauwenberg, 1991).…”

Section: Greenhouse Studymentioning

confidence: 99%

Phosphorus Availability as Affected by the Application of Phosphate Rock Combined With Organic Materials to Acid Soils in Western Kenya

2003

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Most of the agricultural lands in the highlands of western Kenya are depleted of plant nutrients, particularly phosphorus. This depletion has resulted in a continued decline in crop production in the area. Recent experiments, in which direct application of indigenous phosphate rocks were evaluated, have yielded variable results, depending on the relative reactivity of the rock phosphate tested. The effectiveness of rock phosphate was generally low compared with fertilizers such as triple super phosphate. This is attributed to the relatively low solubility of the rocks as opposed to the readily water soluble phosphorus fertilizers. Phosphate rocks are available locally and are cheaper than triple super phosphate. If the solubility of these phosphate rocks could be improved, the resource-poor smallholder farmers in western Kenya would have an affordable source of phosphorus for their crops. Greenhouse and field experiments were conducted to evaluate the effects of combining different on-farm organic materials with the Minjingu rock phosphate (from Tanzania) on the availability of phosphorus to maize (Zea mays) in western Kenya. The greenhouse results indicated that there were significant positive linear relationships between rock phosphate application rates and (i) the Olsen-extractable soil phosphorus in the soil samples taken four weeks and nine weeks respectively after the application of the treatments; (ii) the dry matter yield, and (iii) phosphorus uptake. Results of the field experiments showed that rock phosphate combined with farmyard manure or crop residues (maize stover) generally increased the Olsen-extractable soil phosphorus, maize yields and phosphorus uptake, particularly in the first season when both the Minjingu rock phosphate and organic materials were applied, but the effectiveness of the materials and their combinations varied between the two sites. Combining Minjingu rock phosphate with the organic materials improved its relative agronomic effectiveness for maize.

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“…Quando se dispõe de uma curva de resposta da planta a aplicações do superfosfato triplo, é preferível usar o EqST (Goedert & Lobato, 1984), escolhendo-se a dose de P 2 O 5 que proporcione um rendimento em torno de 80 % da produção máxima (Sanzonowicz & Goedert, 1986). Dos extratores usados para avaliar a disponibilidade de P no solo, o Mehlich-1 superestima a quantidade do P disponibilizada dos FN aplicados no solo (Yost et al, 1982;Almeida et al, 1996), sendo a resina de troca aniônica (RTA) mais apropriada para essa finalidade (Braga et al, 1991;Mutuo, 1999;Silva & Raij, 1999). Entretanto, algumas pesquisas têm mostrado que o P-Mehlich-1 apresentou altas correlações com o P absorvido pela planta e o P-RTA (Vasconcelos et al, 1986b;Freitas et al, 1995;Moreira & Malavolta, 2001).…”

Section: Introductionunclassified

Efeito de fosfatos naturais em plantas de melão cultivadas em vasos

Faria

Silva

Pinto

et al. 2006

Rev. Bras. Ciênc. Solo

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Comparison of phosphate rock and triple superphosphate on a phosphorus‐deficient Kenyan soil

Cited by 29 publications

References 23 publications

The Effect of Minjingu Phosphate Rock and Triple Superphosphate on Soil Phosphorus Fractions and Maize Yield in Western Kenya

The Effect of Minjingu Phosphate Rock and Triple Superphosphate on Soil Phosphorus Fractions and Maize Yield in Western Kenya

Phosphorus Availability as Affected by the Application of Phosphate Rock Combined With Organic Materials to Acid Soils in Western Kenya

Efeito de fosfatos naturais em plantas de melão cultivadas em vasos

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