Agronomic Value of Unacidulated and Partially Acidulated Phosphate Rocks Indigenous to the Tropics

Hammond, L. L.; Chien, S. H.; Mokwunye, A. U.

doi:10.1016/s0065-2113(08)60281-3

Cited by 214 publications

(116 citation statements)

References 35 publications

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“…Os fosfatos naturais têm sua eficiência melhorada quando aplicados a lanço e incorporados a solos ácidos, argilosos, com baixos níveis de Ca trocável e P solúvel e em culturas de ciclo longo ou perenes, tolerantes à acidez e eficientes na utilização de fós-foro (Goedert & Lobato,1984;Hammond et al, 1986;Sanzonowicz & Goedert, 1986).…”

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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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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“…An alternative source of P is rock phosphate. Although it may be a cheaper source of P than SSP, because of its very low P concentration and bulky nature the transportation costs are usually high (Hammond et al, 1986). In addition, peanuts also require large quantities of Ca for better pod growth and seed filling.…”

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confidence: 99%

Response of Peanut to Fungicide and Phosphorus in On-station and On-farm Tests in Ghana

Naab¹,

Prasad²,

Boote³

et al. 2009

Peanut Science

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Peanut (Arachis hypogaea L.) is an important component of cropping systems in West Africa. Identifying production constraints in farmers' fields and evaluating possible management strategies are of prime importance to improve peanut productivity and adoption of new technologies. The objective of our research was to study the influence of fungicides and phosphorus application on severity of leaf spot, dry matter production and pod yield of peanut crops grown in onstation and farmer participatory tests (on-farm conditions) in Northern Ghana. On-station tests to evaluate yield benefits of fungicide sprays and applications of phosphorus were conducted at Wa. On-station tests included two fungicide treatments (no-spray versus fungicide spray) at four P fertilizer levels (0, 30, 60 and 90 kg P ha 21 ). On-farm tests were conducted in three villages Nakor, Piisi and Janguasi with participation of 6-11 farmers per village. On-farm tests included three treatments: (i) farmers' practice of nofungicide and no-fertilizer (control), (ii) only fungicide, and (iii) combination of fungicide and phosphorus. The commonly grown Spanish type cultivar Chinese (90-d duration) was selected. Both leaf spot and lack of phosphorus nutrition were yield-limiting factors in on-farm tests. Applications of fungicide were effective in controlling leaf spot and improved peanut pod yield on average by 49% in the three tested field sites in on-farm tests and by 40% in on-station tests. Application of phosphorus to fungicide-treated plots further increased pod yield by 32% when compared to fungicide alone in on-farm tests. Combination of both fungicide and P fertilizer improved peanut pod yield by 95% (ranged from 75 to 120%), when compared to farmers' practice of no-fungicide and no-fertilizer.

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“…Total P content of GPR was not significantly different from CPR (128 c.f 130 g kg -1 ), however, the solubility of GPR in citric and formic acids was much higher. According to Hammond et al (1986), IPR and GPR corresponded to a category of high reactive PR exhibiting high P solubility in citric acid (> 67 g kg -1 ), while CPR exhibited medium reactivity (34-54 g kg -1…”

Section: Chemical Characteristics Of Phosphate Rockmentioning

confidence: 99%

Characteristics of Phosphate Rock Materials From China, Indonesia and Tunisia and Their Dissolution in Indonesian Acid Soils

Hilman¹,

Musa²,

Rahim³

et al. 2016

Indones. J. Agric. Sci.

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Dissolution of phosphate rock (PR) in soils is a primary concern for P in the PR to be available for plant. The dissolution of three PR materials, China (CPR), Ciamis (IPR) and Gafsa (GPR), in eight acid Indonesian soils (pH in water 4.1-5.7) was tested in a closed incubation system. Experiment was conducted in Soil Chemical Laboratory, Universiti Putra Malaysia and Indonesian Center for Agricultural Land Resources Research and Development from January to April 2002. The dissolution was determined from the increase in either 0.5 M NaOH extractable P (∆P) or 1 M BaCl 2 -triethanolamine (TEA)-extractable Ca (∆Ca) in soils amended with PR compared with control soil. Dissolution of the IPR was the highest (30-100%) followed by GPR (17-69%) and then by CPR (20-54%). The maximum dissolution followed the order: Bogor Ultisols > Bogor Oxisols > Subang Inceptisols > Bogor Inceptisols > Sukabumi Oxisols > Lebak Ultisols > Sukabumi Inceptisols > Lampung Ultisols. PR dissolution indicated a positive correlation with P retention capacity. The results implied that the extent of PR dissolution for the three PR sources (China, Indonesia and Tunisia) increased with increasing P retention capacity of the soils. PR dissolution can be based on a calibration curve of ∆Ca meaning that if ∆P is high then the amount of PR dissolution measured by ∆Ca in PR materials is also high.

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Agronomic Value of Unacidulated and Partially Acidulated Phosphate Rocks Indigenous to the Tropics

Cited by 214 publications

References 35 publications

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

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

Response of Peanut to Fungicide and Phosphorus in On-station and On-farm Tests in Ghana

Characteristics of Phosphate Rock Materials From China, Indonesia and Tunisia and Their Dissolution in Indonesian Acid Soils

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