Soil Fertility and Fertilizers

Tisdale, Samuel L.; Nelson, W. L.

doi:10.1097/00010694-196604000-00016

Cited by 428 publications

(387 citation statements)

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“…These soils are acidic in nature. Low pH coupled with high soil Fe might have contributed to high P fixation (Tisdale et al 1985). In the bottomland, dry season soil P was 75.6% less than the amount observed during the wet season.…”

Section: Mineral Elements In Soilmentioning

confidence: 92%

“…The soil Mg level and the ratio of Mg to other cations affects forage Mg concentration (Minson 1990). A Ca to Mg ratio in excess of 7:1, for instance, can induce a plant Mg deficiency (Tisdale et al 1985). The same also holds true for a K to Mg ratio that exceeds unity (Cottenie 1980).…”

Section: Mineral Elements In Soilmentioning

confidence: 93%

“…Waterlogged bottomland soils are expected to have high extractable Mn. Waterlogging lowers the redox potential and increases availability of the divalent form of the Mn ion (Tisdale et al 1985), which is readily available to plants. Low pH, which is prevalent in soils of Bako area, also increases the availability of Mn (Katyal andRandhawa 1983, Tisdale et al 1985).…”

Section: Mineral Elements In Soilmentioning

confidence: 99%

“…It is alleged that forage Zn levels reflect soil Zn levels. Metallic cations such as Ca, Fe and Mn, when present in high concentration, interfere with plant Zn uptake (Tisdale et al 1985). Looking at the relatively high concentration of these cations and the corresponding low soil Zn level, the potential impairment of plant Zn uptake cannot be excluded.…”

Section: Mineral Elements In Soilmentioning

confidence: 99%

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Mineral element status of soils, native pastures and cattle blood serum in the mid-altitude of western Ethiopia

Gizachew¹,

Hirpha²,

Jalata³

et al. 2002

African Journal of Range & Forage Science

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Despite the crucial role of mineral elements in animal production and health, their status in soil, native pasture and animal body tissues or fluids in the mid-altitude of Ethiopia has had little study. To determine the concentration of mineral elements in soil, native pasture and blood serum of Horro cattle (local zebu), samples were collected from four sites situated within a 30km radius of Bako Research Centre (BRC) at the end of the rainy season and during the following dry season. Mean mineral element concentrations in soil and native pasture in the bottomlands tended to exceed levels in the uplands for almost all investigated elements. Soil Ca, Mg, K, Fe, Mn and Cu concentrations were within the optimum range for active plant growth, but the levels of available Zn and P were below the critical limit. At the upland sites the effect of season on native pasture mineral element concentration was significant only for P (P<0.05) and K (P<0.01). Upland native pasture Zn concentrations in both wet and dry seasons and Cu and P in the dry season were below cattle requirements, but the remainding mineral elements were above or within the recommended range. Except for P, season affected serum mineral element concentrations significantly (P<0.01). There was no significant (P>0.05) difference between male and female cattle for any serum mineral measured. A season x gender interaction was significant (P<0.05) only for serum P. Dry season serum Zn and Mg concentrations in female cattle and dry season serum Cu concentration in bothsexes fell below the critical value. The correlation coefficient between soil and native pasture was r = 0.81 for Ca (P<0.05) and r = 87 for Mg (P<0.05). A negative relationship was obtained between wet season soil Mg and serum Mg in male cattle (r = -0.96; P<0.05). A high negative correlation (r = -0.99; P<0.01) was also obtained between native pasture Mg and serum Mg from male cattle in the wet season. Based on the information obtained from soil, native pasture and serum assays, low levels of Zn, P, Cu and Mg in soil and native pasture could potentially limit livestock production in the study area.

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Section: Mineral Elements In Soilmentioning

confidence: 92%

Section: Mineral Elements In Soilmentioning

confidence: 93%

Section: Mineral Elements In Soilmentioning

confidence: 99%

Section: Mineral Elements In Soilmentioning

confidence: 99%

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Mineral element status of soils, native pastures and cattle blood serum in the mid-altitude of western Ethiopia

Gizachew¹,

Hirpha²,

Jalata³

et al. 2002

African Journal of Range & Forage Science

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“…Embora não tenha sido definitivamente demonstrada a necessidade do cobalto às plantas superiores, várias respostas têm sido obtidas na produção de diversas culturas, pela aplicação do citado elemento (TISDALE & NELSON, 1966). Em 56 amostras de plantas analisadas, FUJIMOTO & SHERMAN (1950), obtiveram de 0,2 a 7,5 ppm de cobalto, com um valor médio de l,62ppm.…”

Section: Introductionunclassified

Aplicação do método espectrofotométrico da 2,2'-dipiridil cetoxima na determinação do cobalto em plantas

Jacintho¹,

Glória²

1976

An. Esc. Super. Agric. Luiz de Queiroz

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Os resultados obtidos nos estudos da parte experimental do método da 2,2'-dipiridil cetoxima, permitiriam o estabelecimento de uma técnica para a determinação do cobalto em plantas. A aplicação do método foi precedida de uma avaliação de sua amplitude, exatidão e precisão. Verificou-se que nos intervalos de 0,9 a 9,0 ou de 1,0 a 10,0 microgramas de cobalto/3 ml do solvente, foram obtidos os menores erros relativos da concentração. Dentro dos limites estudados, o método segue a lei de Beer. A precisão da técnica proposta, avaliada através de ensaios de recuperação, foi considerada satisfatória.

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