Selenium Uptake by Plants from Soils Amended with Inorganic and Organic Materials

Ajwa, Husein A.; Bañuelos, Gary S.; Mayland, H. F.

doi:10.2134/jeq1998.00472425002700050029x

Cited by 64 publications

(35 citation statements)

References 32 publications

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“…Previous studies have shown that incorporation of catch crops, crop residues and manure in the soil reduced the availability of native soil Se or the Se added through fertilisation (Ajwa et al 1998;Stavridou et al 2011). On the other hand, Falk Øgaard et al (2006) have found that the addition of cattle manure together with selenate might increase Se concentrations in wheat grain.…”

Section: Discussionmentioning

confidence: 99%

The effect of catch crop species on selenium availability for succeeding crops

2011

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Background and Aims Selenium (Se) is an essential nutrient for humans and animals. In order to ensure an optimal concentration of Se in crops, Se fertilisers are applied. Catch crops may be an alternative way to increase Se concentrations in vegetables.Methods Three experiments in Denmark between 2007-10 investigated the ability of catch crops (Italian ryegrass, fodder radish and hairy vetch) under different fertiliser regimes to reduce soil Se content in the autumn and to increase its availability in spring to the succeeding crop. Results and Conclusions The catch crops (Italian ryegrass and fodder radish) increased water-extractable Se content in the 0.25-0.75 m soil layer in only one of the experiments. Selenium uptake by the catch crops varied between 65 and 3263 mg ha −1 , depending on species, year and fertilisation treatment; this corresponded to 0.1-3.0% of the water-extractable soil Se content. The influence of catch crops on Se concentrations and uptake in onions and cabbage was low. There was a decrease in Se uptake and recovery of applied Se by onions following catch crops, which might indicate Se immobilisation during catch crop decomposition.

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Section: Discussionmentioning

confidence: 99%

The effect of catch crop species on selenium availability for succeeding crops

2011

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“…Brassica napus grown for Se phytoremediation may be used in animal rations as long as the Se content is known and the forage B. napus content of the ration is adjusted to not exceed recommended threshold levels. Selenium uptake by B. napus is much greater when Se is available as inorganic selenate rather than seleniforous organic material (Ajwa et al 1998). Similarly, B. napus grown for Mo phytoremediation may be used as animal fodder as long as the Cu:Mo ratio is not below 2: 1 (McDowell 1985).…”

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The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

Gulden¹,

Warwick²,

Thomas³

2008

Can. J. Plant Sci.

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. 2008. The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa. Can. J. Plan Sci. 88: 951Á996. Brassica napus and B. rapa are native to Eurasia. In Canada, these species are commonly referred to as volunteer canola, while feral populations of B. rapa are referred to as birdrape. Brassica napus and B. rapa have been grown commercially for their seed oil content in western Canada since the middle of the last century and volunteer populations are common in fields. Escaped populations of both species are also found along roadways, railways and in waste areas; however, only B. rapa is known to have naturalized, self-sustaining feral populations in these habitats in eastern Canada. Despite these escaped and feral populations, B. napus and B. rapa are mainly a concern in agricultural fields where their combined relative abundance has increased over the past few decades. In the mid 1990s, herbicideresistant genotypes of B. napus were released for commercial production. Herbicide-resistance and the stacking of genes in volunteer populations conferring resistance to multiple herbicides have contributed to increased difficulties in controlling volunteer B. napus in some crops. However, yield loss resulting from volunteer populations is not well documented in Canada.Key words: Brassica napus, Brassica rapa, herbicide resistance, transgene escape, volunteer canola, weed biology Gulden, R. H., Warwick, S. I. et Thomas, A. G. 2008. La biologie des mauvaises herbes au Canada. 137. Brassica napus L. et B. rapa L. Can. J. Plant Sci. 88: 951Á996. Brassica napus et B. rapa sont des plantes originaires d'Eurasie. Au Canada, on les de´signe souvent sous l'expression « canola spontane´», tandis que les peuplements sauvages de B. rapa sont appele´s « navette ». Dans l'Ouest canadien, Brassica napus et B. rapa sont cultive´s commercialement pour l'huile que renferment leurs graines depuis le milieu du sie`cle dernier et les repousses spontane´es sont devenues monnaie courante dans les champs. On observe des peuplements des deux espe`ces le long des routes et des voies ferre´es ainsi que dans les terrains vagues, cependant on sait que seule B. rapa s'est acclimate´e pour donner des populations sauvages et stables dans les meˆmes habitats, dans l'est du pays. Malgre´cela, B. napus et B. rapa demeurent surtout pre´occupants dans les cultures, oul eur abondance relative, une fois combine´s, s'est accrue au cours des dernie`res de´cennies. Au milieu des anne´e 1990, des ge´notypes de B. napus re´sistants aux herbicides ont e´te´homologue´s pour la culture commerciale. Cette re´sistance et l'accumulation des ge`nes qui la codent dans les peuplements spontane´s ont concouru a`compliquer la lutte contre les repousses de B. napus dans certaines cultures. Quoi qu'il en soit, les pertes de rendement qui en re´sultent sont mal e´taye´es au Canada.

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“…Methods of increasing forage Se concentrations through the use of soil amendments have been successful in providing adequate Se in forage to cattle (Ajwa et al 1998). Currently, the use of fertilizers containing Se is not legal in California, leaving direct supplementation of livestock the only method to alleviate Se deficiency.…”

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Efficacy of selenium supplementation methods in California yearling beef cattle and resulting effect on weight gain

Davy¹,

Forero²,

Tucker³

et al. 2016

Cal Ag

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Selenium (Se) deficiency occurs commonly in California grazing cattle and has been associated with reduced immune function and, in some studies, reduced weight gain. Multiple methods of supplementing Se are available, but little research has compared the effects of these methods on whole blood Se levels and weight gain. In two trials, we evaluated four methods of Se supplementation -an intrarumenal bolus, two injectable preparations and a loose salt containing 120 ppm Se -over an 85-to 90-day period in Se-deficient yearling cattle in Tehama County. The bolus treatment raised whole blood Se levels to an adequate level (0.08 ppm) for the entire study period. Whole blood Se concentrations in injected cattle initially reached adequate levels but then declined to deficient levels. The loose salt treatment acted slowly, with average whole blood Se concentration reaching adequate levels at the end of the study period. None of the treatments significantly affected weight gain and Se blood concentration was not correlated with weight gain. In growing cattle, it appears that Se supplementation may be viewed not as a direct driver of weight gain, but rather as similar to vaccination, in that it can prevent health problems that might otherwise lead to reduced weight gain.

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Selenium Uptake by Plants from Soils Amended with Inorganic and Organic Materials

Cited by 64 publications

References 32 publications

The effect of catch crop species on selenium availability for succeeding crops

The effect of catch crop species on selenium availability for succeeding crops

The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

Efficacy of selenium supplementation methods in California yearling beef cattle and resulting effect on weight gain

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