Anderson, S.

Maqsood, M.A.

Schoenau, J.J.

Vandenberg, B.

Warkentin, T.

English

University of Saskatchewan Research Archive

The Influence of Zinc Fertilization on Bioavailable Zinc Content in LentilMuhammad A Maqsood1, Jeff Schoenau1, Sarah Anderson1, Albert Vandenberg2 and Tom Warkentin21Department of Soil Science, University of Saskatchewan, Sk2Department of Plant Sciences, University of Saskatchewan, SkFigure 1. Influence of soil and foliar applied Zn fertilizer on strawand grain yield of Impower (large green lentil class)grown on a Dark Brown Chernozem.*(Plants were harvested at 30 days and maturity (110 days) and separated into lower and upper shoots)Project Description•Zinc (Zn) is one essential nutrient that is deficient in the humandiet in many developing countries where Saskatchewan lentil ismarketed.•Both genetic and agronomic approaches can be effective inincreasing Zn concentration in grain of lentil.•Estimation of Zn in lentils and its bioavailability to humans isprerequisite for an effective biofortification program.Goals of Project•The main goal of this project was to determine the variationamong three market classes of lentils for Zn distribution in strawand grain and bioavailability in response to Zn fertilizerapplication to a Dark Brown ChernozemMethods•Homogenized soil from 0-15 cm of a Dark Brown Chernozem(Regina Association) were placed in 1kg pots. Basal dose of N,Pand S was supplied to all pots. Zinc sulfate was used to supply Znat a rate of 2.5 kg Zn ha-1. Zinc was also supplied in foliar form(Zn-EDTA) at a rate of 0.246 kg Zn ha-1. A popular CDC variety ofeach of the three (large and small green, small red) lentil classes(Impower, Imvincble, Maxim) was grown on each soil. Half of thelentil plants were harvested at 30 days after seedling emergenceand the remainder at maturity. Harvested plants were furtherseparated into lower and upper shoots and analyzed for Znconcentration.•Harvested grain samples were also analyzed for phytate-Pcontent following a modified method of Gao et al. (2007).Mineral bioavailability was qualitatively estimated as[phytate]:[mineral] ratio in grains (Brown et al. 2001). Zincbioavailability in lentil grain was also quantitatively estimated byemploying the trivariate model of Zn absorption (Miller et al.2007):Key Outcomes•Zinc fertilizer application influenced grain yield and biomasspartitioning in lentil classes. For example, in large green lentil class(Figure 1) there was a reduction in the biomass but increase in grainyield with application of Zn. The increase in grain yield was morepronounced with foliar Zn application.•Application of foliar Zn fertilizer increased the shoot concentrationsof Zn while soil application increased the grain concentration of Zn(Figure 2). Zinc is taken up over the season and eventuallyredistributed from the shoots to the grain.•Reduction in grain phytate-P content was observed with Znapplication. A significant decrease in the phytate:Zn ratio from Znfertilization, indicating greater human bioavailability of the Zn, wasonly observed for the treatment with foliar application of chelatedZn to small green lentil (Figure 3). The molar phytate: Zn ratio in alllentil classes was less than 15, indicating high Zn bioavailability.Quantitatively estimated Zn bioavailability using the trivariate modelin all lentil classes was > 3 mg Zn / 300grams.Conclusions•Application of Zn fertilizer increased concentration of Zn, reduced thephytate content, and in one market class (small green) increased theapparent bioavailability of the Zn in the lentil grain.• Zn fertilization offers promise as a means of increasing the humannutritional value of lentil.Acknowledgments• Financial support from Saskatchewan Pulse Growers, Agriculture Development Fund and NSERC• Thanks to Western Ag Labs, Saskatoon for soil nutrient supply rate analysis , Gary Kruger and Derek Derdall for help in soil collectionFigure 2. Influence of soil and foliar applied Zn fertilizer on zinc (Zn) concentration in straw and grain of Impower (large green lentil class) grown on a Dark Brown Chernozem.Figure 3. Influence of soil and foliar applied Zn fertilizer on molar phytate:Zn ratio in the grain of three market classes of lentil.

The influence of zinc fertilization on bioavailable zinc content in lentil

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The influence of zinc fertilization on bioavailable zinc content in lentil

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