Some effects of reaction (pH) changes in a basaltic soil on the mineral composition of growing crops

Stewart, John; McConaghy, S.

doi:10.1002/jsfa.2740140903

Cited by 4 publications

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References 12 publications

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“…When 5 liming results in an appreciable increase in soil pH (e.g. from pH <5.5 to 7.0), there is usually a substantial reduction in the concentrations of Fe, Mn and Co, a small reduction or little difference in Zn and Cu, and an increase in Mo (Mitchell 1963;Stewart and McConaghy 1963;Moschler 1965, 1970;10 John et al 1972;Edmeades et al 1983).…”

Section: Soil Factors Affecting Micronutrient Availability 45mentioning

confidence: 99%

Micronutrients limiting pasture production in Australia

Brennan¹,

Penrose

Bell

2019

Crop Pasture Sci.

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Low levels of plant-available micronutrients were an inherent feature of many agricultural soils in Australia, mostly due to the prevalence of highly weathered soil parent materials. The diagnosis and correction of the widespread deficiencies of micronutrients, especially copper (Cu), molybdenum (Mo) and zinc (Zn), were prerequisites for the development of productive, legume-based pastures in southern Australia. In subtropical and tropical regions, Mo deficiency commonly limited pasture-legume production. Soil treatments involving micronutrient fertiliser incorporated in soils, or applied as additives to superphosphate, were generally effective in alleviating micronutrient deficiencies. In the low-output dryland pasture systems, the annual removal of micronutrients in wool and meat is small compared with rates added in fertiliser. Hence, in general, the residues of soil-applied micronutrient fertilisers remain effective for many years, for example, up to 30 years for Cu. By contrast, shorter residual values occur for manganese (Mn) fertiliser on highly calcareous soils, and for Zn in high-output pasture systems such as intensive dairy production. In the last two decades since the recommendations for micronutrient management of pastures were developed, there have been many changes to farming systems, with likely implications for micronutrient status in pastures. First, increased cropping intensity and low prices for wool and meat have meant lower nutrient inputs to pastures or to the pasture phase of rotations with crops. However, when pastures have been rotated with crops, ongoing small additions of Cu, Zn and Mo have been common. In cropping phases of farming systems, lime application and no-till may have altered the chemical and positional availability of micronutrients in soils to pastures. However, there has been little study of the impacts of these farming-systems changes on micronutrient status of pastures or profitability of the production system. The intensification of dairy production systems may also have altered the demand for, and removal rates of, micronutrients. Soil tests are not very reliable for Mn or Mo deficiencies, and well-calibrated soil tests for boron, Cu and Zn have been developed only for limited areas of pasture production and for a limited range of species. There is limited use of plant tests for nutrient management of pastures. In conclusion, there is limited knowledge of the current micronutrient status of pastures and their effects on animal health. Pasture production would benefit from targeted investigation of micronutrients status of pasture soils, pasture plants and micronutrient-linked animal-health issues.

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Section: Soil Factors Affecting Micronutrient Availability 45mentioning

confidence: 99%

Micronutrients limiting pasture production in Australia

Brennan¹,

Penrose

Bell

2019

Crop Pasture Sci.

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Crop composition in relation to soil pH and root cation‐exchange capacity

Crooke¹,

Knight²

1971

J Sci Food Agric

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Using a granitic soil limed to give p H values from 4 . 5 to 7 . 5 , variation in the mineral composition of oats, barley, wheat, swede andpotato was examined in relation to soil p H and the possible effect of root cation-exchange capacity (CEC). An increase in soil p H caused increases in root CEC, total cation (Ca+Mg+K+Na) and N contents of the monocotyledon crops butproduced no change in root CEC and no consistent variation in total cations or N of the dicotyledon crops. Distinctly diyerent cafion translocation patterns were found between monocotyledons (low CEC) and dicotyledons (high CEC). The former favour translocation of monovalent cations, thus leaving their roots richer in divalent cations, while the opposite process takes place in swedes, but not in potatoes. This feature may be related lo differences in the number of exchange sites in the roots and other tissues of these two classes of plant. Little change in P content was noted in tops of swedes or potatoes, but it increased with soil p H in cereal tops. Liming had variable effects on the contents of Fe, Mn and Cu. The Fe content of cereal tops altered little but both swede and potato tops had higher contents at high p H . The rate of reduction in the Mn content of the tops of all crops, except barley, increased above pH 6.0 or 6 . 5 ; little change in the Cu content of cereal or potato tops was noted, but levels in swede tops and potato tubers fell sharply on liming.

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References

1990

Forage in Ruminant Nutrition

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Some effects of reaction (pH) changes in a basaltic soil on the mineral composition of growing crops

Cited by 4 publications

References 12 publications

Micronutrients limiting pasture production in Australia

Micronutrients limiting pasture production in Australia

Crop composition in relation to soil pH and root cation‐exchange capacity

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