Stimulation of seedling root growth by coal-derived sodium humate

Venter, H. A. van de; Furter, M.; Dekker, Jack; Cronje, I. J.

doi:10.1007/bf00011803

Cited by 24 publications

(6 citation statements)

References 15 publications

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“…Briefly, Na + humate is a humic acid salt obtained by sodium hydroxide extraction of black or brown coal (lignite or leonardite) and is used as a soil conditioner, as a stabilizer for ion exchange resins in water treatment, as a drilling additive in the drilling of wells for hydrocarbon exploration/extraction and geothermal drilling, and in the remediation of polluted environments (http://www.ahmadsaeed.com/sodium_Humate.html). Apart from its mainly industrial use, limited studies have also tested its effects on plant growth, with results ranging from none to stimulatory or negative effects (Van De Venter et al ., ; Sharif et al ., ; Iakimenko, ; Tahir et al ., ). However, the current use of Na + humate described here has not, to our knowledge, been reported in the literature.…”

Section: Discussionmentioning

confidence: 99%

Uncoupling of sodium and chloride to assist breeding for salinity tolerance in crops

et al. 2015

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SummaryThe separation of toxic effects of sodium (Na + ) and chloride (Cl À ) by the current methods of mixed salts and subsequent determination of their relevance to breeding has been problematic. We report a novel method (Na + humate) to study the ionic effects of Na + toxicity without interference from Cl À , and ionic and osmotic effects when combined with salinity (NaCl).Three cereal species (Hordeum vulgare, Triticum aestivum and Triticum turgidum ssp. durum with and without the Na + exclusion gene Nax2) differing in Na + exclusion were grown in a potting mix under sodicity (Na + humate) and salinity (NaCl), and water use, leaf nutrient profiles and yield were determined. Under sodicity, Na + -excluding bread wheat and durum wheat with the Nax2 gene had higher yield than Na + -accumulating barley and durum wheat without the Nax2 gene. However, under salinity, despite a 100-fold difference in leaf Na + , all species yielded similarly, indicating that osmotic stress negated the benefits of Na + exclusion. In conclusion, Na + exclusion can be an effective mechanism for sodicity tolerance, while osmoregulation and tissue tolerance to Na + and/or Cl À should be the main foci for further improvement of salinity tolerance in cereals. This represents a paradigm shift for breeding cereals with salinity tolerance.

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Section: Discussionmentioning

confidence: 99%

Uncoupling of sodium and chloride to assist breeding for salinity tolerance in crops

et al. 2015

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“…In Van de Venter et al (1991) , coal -derived sodium humate was found to stimulate primary root growth of seedlings of cantaloupe ( Cucumis melo L.), lettuce ( Lactuca sativa L.), and onion ( Allium cepa L.). Growth enhancement was not due to the release of nutrient elements by the product; and, in the case of lettuce and onion, it was not due to increased availability or uptake of mineral elements.…”

Section: Morphological Changes In Response To Humic Substancesmentioning

confidence: 99%

Biological Activities of Humic Substances

Nardi

Carletti

Pizzeghello

et al. 2009

Biophysico‐Chemical Processes Involving Natural Nonliving Organic Matter in Environmental Systems

116

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“…Although results of studies of HA effects on plant growth are sometimes contradictory, some commonalities exist. These include the quadratic nature of plant responses, be it direct or indirect, to increasing amounts of HA (Lee and Bartlett 1976;Albuzio et al 1986;Van de Venter et al 1991).…”

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Response of canola, wheat and green beans to leonardite additions

Akinremi¹,

Janzen²,

Lemke³

et al. 2000

Can. J. Soil. Sci.

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. 2000. Response of canola, wheat and green beans to leonardite additions. Can. J. Soil Sci. 80: 437-443. Leonardite, an oxidized form of lignite obtained from coal mines, is readily available and high in humic acids (HA). It has potential as a soil amendment and may have positive effects on crop growth and yield. This greenhouse experiment evaluated the agronomic effect of leonardite on three crops: canola (Brassica napus), wheat (Triticum aestivum) and green beans (Phaseolus vulgare). The factorial design combined five rates of leonardite with five fertility treatments. The fertility treatments had a significant effect on the dry matter yield (DMY) of canola, wheat and green beans. There were also significant effects of fertility on the concentration and uptake of N, P and K by the three crops and S by canola. The application of leonardite had no significant effect on the DMY of wheat and green beans but that of canola was significantly increased. Application of 10 g of leonardite to 3 kg of soil caused a 27% increase in the DMY of canola when S was excluded from added nutrients, while 1 g of leonardite resulted in a 15% increase in yield when all nutrients were applied. In addition, uptake of S, N, P and K by canola were significantly affected by the application of leonardite. The yield response of canola was apparently due to the supply of S by leonardite with an increasing rate of leonardite supplying increasing amounts of S. This result was confirmed in a second experiment where high quantities of leonardite were applied. We concluded that leonardite increased the yield of canola by supplying S directly and by possibly facilitating the uptake of other nutrients. The lack of response of wheat and green beans to leonardite was attributed to their lack of response to S. The experiment showed beneficial effects of leonardite on canola, though high rates may be needed to exploit this benefit in field situations. L'expérience, conduite en dispositif factoriel, combinait cinq doses de léonardite à cinq niveaux de fumure. Ces derniers démon-traient un effet significatif sur le rendement en matière sèche (r.m.s) des trois cultures ainsi que sur les taux d'absorption et sur les concentrations de N,P,K dans les trois cultures, de même que sur celles de S dans le colza canola. Les apports de léonardite n'avaient pas d'effet significatif sur le r.m.s. du colza canola mais pas sur celui du blé et des haricots. L'apport de 10 g de léonardite dans 3 kg de sol causait un accroissement de 7 % du r.m.s. chez le canola lorsque que S était exclu de la fumure, alors qu'en présence des quatre éléments fertilisants l'accroissement était de 15 % avec 1 g seulement de léonardite. Par ailleurs, les quantités de S, N, P et K absorbées par le canola étaient influencées par la présence de léonardite. Le comportement du rendement du canola était vraisemblablement du à la fourniture du S par la léonardite, laquelle augmentait avec l'accroissement du taux d'inclusion de l'amendement. Ces observations étaient d'ailleurs confirmées dans une...

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Stimulation of seedling root growth by coal-derived sodium humate

Cited by 24 publications

References 15 publications

Uncoupling of sodium and chloride to assist breeding for salinity tolerance in crops

Uncoupling of sodium and chloride to assist breeding for salinity tolerance in crops

Biological Activities of Humic Substances

Response of canola, wheat and green beans to leonardite additions

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