Potassium‐magnesium antagonism in soils and crops

Welte, E.; Werner, W.

doi:10.1002/jsfa.2740140309

Cited by 12 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interactive effects of K, Ca, and soil pH with plant Mg uptake have also been found in several earlier studies (Welte & Werner 1963;Salmon 1964;Christenson et al 1973), and various other workers have attempted to synthesise composite indices of several relevant soil properties. These attempts to improve predictions of plant Mg availability using soil data have led to the use of parameters such as percentage Mg saturation of cation exchange capacity or of total exchangeable bases (Alston 1972) and cation activity ratios of Mg, Ca, K, and H in equilibrium soil solution extracts (Bould 1964;Salmon 1964;Arnold 1967;Alston 1972).…”

Section: General Discussion and Conclusionmentioning

confidence: 58%

Survey of magnesium content of soils and pastures and incidence of grass tetany in three selected areas of Taranaki

Turner

Neall

Wilson

1978

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

Section: General Discussion and Conclusionmentioning

confidence: 58%

Survey of magnesium content of soils and pastures and incidence of grass tetany in three selected areas of Taranaki

Turner

Neall

Wilson

1978

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

“…Significance of the latter approach is based on the ternary exchange between K-Ca-Mg especially in agricultural soils where these ions are dominating soil matrix (Romheld & Kirkby, 2010;Sparks et al, 1990). Ohno and Grunes (1985); Welte and Werner (1963);and Jakobsen (1992) conclusively demonstrated that either K, Ca or Mg deficiencies are not exclusively dependent on the soil solution concentration. Interactions between the ions also play a crucial role, and this relationship is commonly antagonistic in nature, hence quantifying these ions by accounting for these interactions is mechanistically justified.…”

Section: Discussionmentioning

confidence: 90%

Comparing Extraction and Quantity/Intensity Based Recommendations for Nitrogen, Phosphorus and Potassium Recommendation

Nongqwenga¹,

Modi²

2015

JAS

View full text Add to dashboard Cite

Conventional, extraction based fertilizer recommendations for phosphorus and potassium have been shown to lack mechanistic basis, thus unreliable. This has led to an urgent need for the development and evaluation of accurate and consistent phosphorus and potassium recommendations approaches with mechanistic basis. Also it has been shown that integrating nitrogen mineralization on nitrogen recommendations, has a potential of improving nitrogen recommendations. We established two parallel pot trial studies with the objective of comparing between extraction based fertilizer recommendations with alternative strategies. The first study was to compare the effect of integrating nitrogen mineralization on N recommendations. Second pot experiment in addition to N being recommended after integrating N mineralization; P and K were also recommended with an alternative strategy, which was derived from quantity/intensity relations. No negative impacts were observed on crop growth and nutrient uptake due to the integration of mineralizable nitrogen, despite nitrogen amounts being lower compared to treatments where N was applied without adjusting for mineralizable N. The same was true for the second pot trial, P and N recommended by conventional approach were higher, yet the crop response was not concurrently improved by higher rates. Potassium rates recommended by alternative strategy were higher and this was concurrent with potassium uptake. We therefore concluded, that this NPK recommendation experimental approach (N e P e K e ) is superior to its conventional counterpart (N c P c K c ). Hence, more reliable recommendations can be developed using this approach and this might reduce environmental footprint of agro-ecosystems, and reduce input cost for farmers where warranted.

show abstract

“…Hypomagnesemia of primary origin is due to a dietary deficiency of Mg (Constable et al 2017). The concentration of Mg in the plant is partially determined by the level of exchangeable Mg in the soil (Metson 1974) and dietary Mg deficiency is associated with grasses in soils that have 0.2-0.3meq of exchangeable Mg/100g of plant roots (Welte & Werner 1963). The use of fertilizers with nitrogen (N), phosphorus (P) and potassium (K) reduces the exchangeable Mg in the soil and the availability of Mg for the plants and, consequently, for the animals (Kemp et al 1961, Grunes et al 1970, Fox & Piekielek 1984, Cohen et al 2004, Elliott 2008, Kumssa et al 2019.…”

Section: Introductionmentioning

confidence: 99%

Hypomagnesemia in beef cattle

et al. 2021

View full text Add to dashboard Cite

Hypomagnesemia is a major cause of death in grazing beef cows in countries of the Southern Hemisphere such as Argentina, Australia and New Zealand. Here we review the literature on hypomagnesemia in beef cattle and describe an outbreak in Uruguay. The disease occurred in late autumn, affecting 6 to 11-year-old Aberdeen Angus and Hereford x Aberdeen Angus lactating multiparous cows in good body condition, grazing on natural grasslands that had been improved by fertilization and sowing of seeds of ryegrass and oat. Approximately 40 out of 225 cows were affected and 24 (10.7%) died. A presumptive diagnosis of hypomagnesemia was established based on sudden death, acute neuromuscular clinical signs, epidemiological data, and the response to Mg administration. The diagnosis was confirmed by detecting low Mg concentrations in serum (0.47-0.57mmol/L), vitreous humor (0.47-0.80mmol/L), aqueous humor (0.66mmol/L) and cerebrospinal fluid (0.59mmol/L). The largest component of the diet corresponding to fast-growing and exuberant forages of ryegrass and oat had high concentrations of K (3.48%), N (4.38%) and P (0.94%), suggesting secondary hypomagnesemia. In addition, the K/(Ca+Mg) ratio was 2.38 in forages of ryegrass and oat (reference value: 2.2), and 0.15 in the soil (reference value: 0.09), which represent risk factors for hypomagnesemia. In conclusion, hypomagnesemia is an important cause of mortality in beef cattle grazing improved natural grasslands in Uruguay and it can be easily prevented by correct seasonal Mg supplementation.

show abstract

Potassium‐magnesium antagonism in soils and crops

Cited by 12 publications

References 0 publications

Survey of magnesium content of soils and pastures and incidence of grass tetany in three selected areas of Taranaki

Survey of magnesium content of soils and pastures and incidence of grass tetany in three selected areas of Taranaki

Comparing Extraction and Quantity/Intensity Based Recommendations for Nitrogen, Phosphorus and Potassium Recommendation

Hypomagnesemia in beef cattle

Contact Info

Product

Resources

About