The Use of Phosphate Rock for Direct Application to Soils

Khasawneh, F. E.; Doll, E. C.

doi:10.1016/s0065-2113(08)60706-3

Cited by 363 publications

(214 citation statements)

References 67 publications

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“…Across field studies in East Africa, an over-yield effect of Minjingu PR relative to TSP at equivalent P rates is generally observed by year 3 (104%) and has been attributable in part to its greater nutrient cation content (Szilas et al 2007a). In addition to promoting reductions in exchangeable acidity, Ca additions via PR represent a significant input to weathered soils (Khasawneh and Doll 1979), which are generally Ca deficient (Njoku et al 1987;Sale and Mokwunye 1993;Vitousek et al 2010). Given that Ca may be an overlooked nutrient limitation in western Kenya (Kihara and Njoroge 2013), Minjingu PR offers additional non-P benefits to farmers in this region.…”

Section: Liming Effects Of P Fertilizersmentioning

confidence: 99%

Biological P cycling is influenced by the form of P fertilizer in an Oxisol

et al. 2017

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Phosphate rock (PR) is an alternative fertilizer to increase the P content of P-deficient weathered soils. We evaluated the effects of fertilizer form on indicators of biological cycling of P using an on-farm trial on a Rhodic Kandiudox in western Kenya. Treatment plots were sampled after 13 cropping seasons of P applications as Minjingu phosphate rock (PR) or as triple super phosphate (TSP) (50 kg P ha −1 season −1 ), as well as a P-unfertilized control (0 kg P ha −1 season −1 ). Soils (0-15 and 15-30 cm) were analyzed for microbial biomass P (P mic ), activities of acid phosphomonoesterase, alkaline phosphomonoesterase, and phosphodiesterase, and sequentially extractable P fractions. P additions as Minjingu PR yielded 299% greater P mic than TSP at 0-15-cm depth despite similar labile P concentrations in the two P fertilization treatments and stimulated activities of acid phosphomonoesterase (+39%). When added in the soluble form of TSP, a greater percentage of total soil P was present in mineral-bound forms (+33% Fe-and Al-associated P). Higher soil pH under Minjingu PR (pH 5.35) versus TSP (pH 5.02) and the P-unfertilized treatment (pH 4.69) at 0-15-cm depth reflected a liming effect of Minjingu PR. The form of P fertilizer can influence biological P cycling in weathered soils, potentially improving P availability under Minjingu PR relative to TSP via enhanced microbial biomass P and enzymatic drivers of P cycling.

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Section: Liming Effects Of P Fertilizersmentioning

confidence: 99%

Biological P cycling is influenced by the form of P fertilizer in an Oxisol

et al. 2017

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“…A eficiência dos fosfatos naturais depende de fatores relacionados com suas características intrín-secas, com as propriedades do solo, com as práticas de manejo e com as características da planta (Khasawneh & Doll, 1978;Chien & Menon, 1995;Rajan et al, 1996).…”

Section: Introductionunclassified

Avaliação do fosfato natural de Gafsa para recuperação de pastagem degradada em latossolo vermelho-escuro

Soares

Lobato

Sousa

et al. 2000

Pesq. agropec. bras.

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e THOMAZ ADOLPHO REIN 2 RESUMO -Este experimento de campo, instalado em janeiro de 1994, teve os objetivos: 1) avaliar a eficiência do fosfato natural de Gafsa farelado (FGF) na recuperação de pastagem de Brachiaria decumbens cv. Basilisk num Latossolo Vermelho-Escuro textura argilosa do Distrito Federal, e 2) verificar efeitos de interações entre fontes de P (fosfato natural de Gafsa e superfosfato triplo (SFT) e incorporação do fosfato com grade e adubação complementar (N, Ca, Mg, K, S e micronutrientes), sobre a disponibilidade de forragem. Os fosfatos foram aplicados na dose de 100 kg ha -1 de P 2 O 5 . O delineamento foi o de blocos casualizados, com parcelas subdivididas, com o tratamento incorporação nas parcelas e o fatorial, fontes de P vs. adubação complementar, nas subparcelas, perfazendo 12 tratamentos com quatro repetições. A resposta à aplicação dos fosfatos só foi efetivada com aplicação simultânea de adubação complementar; a incorporação com grade foi essencial para aumentar a eficiência do FGF; ao ser incorporado com grade, o FGF teve desempenho tão bom quanto o SFT; sem incorporação, o FGF proporcionou produção de matéria seca inferior à proporcionada pelo SFT (p<0,05).Termos para indexação: fosfato de rocha reativo, cerrados, Brachiaria decumbens, adubação de pastagem. EVALUATION OF A COARSE-GROUND GAFSA ROCK PHOSPHATE IN THE RECUPERATION OF A DEGRADED PASTURE ON A CLAYEY DARK-RED LATOSOLABSTRACT -A field experiment was conducted on a Dark-Red Latossol (Haplustox) of the Cerrado of the Federal District, Brazil, to evaluate a coarse-ground Gafsa rock phosphate (CGRP) in the recuperation of a Brachiaria decumbens cv. Basilisk pasture. CGRP was compared with triple superphosphate (TSP) at a P 2 O 5 rate of 100 kg ha -1 both applied by broadcasting. A control treatment without P was included together with two other variables: 1) incorporation of the phosphate with a harrow (with and without) and 2) supplementary fertilization (SF) with Ca, Mg, N, K, S and micronutrients (presence and absence). The response to application of phosphates was only observed with the simultaneous application of SF; incorporation was essential for increasing the efficiency of CGRP; with incorporation, the efficiency of CGRP was equal to that of TSP; without incorporation, TSP was significantly superior to CGRP (p< 0.05).

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“…like rock phosphate (Khasawneh & Doll, 1978) are low-input technological practices which might lead to the development of sustainable soil-plant systems (Barea & Jeffries, 1995). Legumes have a particular significance in such a development (Bohlool et al, 1992).…”

mentioning

confidence: 99%

The use of isotopic dilution techniques to evaluate the interactive effects of Rhizobium genotype, mycorrhizal fungi, phosphate‐solubilizing rhizobacteria and rock phosphate on nitrogen and phosphorus acquisition by Medicago sativa

1998

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A pot experiment was designed to evaluate the interactive effects of multiple microbial inoculation treatments and rock phosphate (RP) application on N and P acquisition by alfalfa plants using "&N and $#P isotopes. The microbial inocula consisted of a wild type (WT) Rhizobium meliloti strain, its genetically modified (GM) derivative, which had an enhanced competitiveness, the arbuscular mycorrhizal (AM) fungus Glomus mosseae (Nicol. and Gerd.) Gerd. and Trappe, and a phosphate-solubilizing rhizobacterium (Enterobacter sp.). Inoculated micro-organisms became established in the root tissues and\or in the rhizosphere soil of alfalfa plants (Medicago sativa L.). The GM Rhizobium strain did not interfere with AM formation. Inoculated phosphate-solubilizing rhizobacteria established in the alfalfa rhizosphere, but the level of establishment was lower where the natural population of phosphatesolubilizing bacteria was stimulated by AM inoculation and RP application. The stimulation of these indigenous bacteria was also greater in the rhizosphere of alfalfa nodulated by the GM Rhizobium. Improvements in N and P accumulation in alfalfa corroborate beneficial effects of the improved GM Rhizobium on AM performance, in RP-amended plants. Inoculation with Enterobacter did not improve the AM effect on N or P accumulation in the RP-added soil, but it did in the non RP-amended controls. Measurements of the "&N:"%N ratio in plant shoots indicated enhanced N # fixation rates in Rhizobium-inoculated AM-plants, over that achieved by the same Rhizobium strain in non-mycorrhizal plants. Regardless of the Rhizobium strain and of whether or not RP was added, AM-inoculated plants showed a lower specific activity ($#P:$"P) than did their comparable non-mycorrhizal controls, suggesting that the plant was using otherwise unavailable P sources. The phosphate-solubilizing, AMassociated, microbiota could in fact release phosphate ions, either from the added RP or from the indigenous ' lessavailable ' phosphate. Deficiency in Ca concentration in soil solution in the neutral test soil might benefit P solubilization. The proportion of plant P derived either from the labelled soil P (labile P pool) or from RP was similar for AM inoculated and non-mycorrhizal controls (without Enterobacter inoculation) for each Rhizobium strain, but the total P uptake, regardless of the P source, was far higher in AM-plants. Enterobacter inoculation seems to improve the use of RP in the rhizosphere of non-mycorrhizal plants inoculated with the WT Rhizobium.

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The Use of Phosphate Rock for Direct Application to Soils

Cited by 363 publications

References 67 publications

Biological P cycling is influenced by the form of P fertilizer in an Oxisol

Biological P cycling is influenced by the form of P fertilizer in an Oxisol

Avaliação do fosfato natural de Gafsa para recuperação de pastagem degradada em latossolo vermelho-escuro

The use of isotopic dilution techniques to evaluate the interactive effects of Rhizobium genotype, mycorrhizal fungi, phosphate‐solubilizing rhizobacteria and rock phosphate on nitrogen and phosphorus acquisition by Medicago sativa

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