Factors affecting utilization of zinc from zinc fertilizer bands: Effect of concentrations of zinc in zncl2 and zn-edta fertilizer bands on root growth and zinc uptake by wheat
2000
Nyaki, A.S.(Mlingano Agricultureal Research Institute (Senior Agricultural Research Officer ), Tanzania) | Racz, G.J.(University of Manitoba, Winnipeg, Canada)
Factors affecting the extent of utilisation of zinc from zinc fertiliser bands include the extent of solubility and movement of zinc from the fertiliser band, the extent of root to zinc fertiliser contact as well as the concentration of and extent of root growth in the fertiliser band. Growth chamber and incubation studies were conducted to compare the extent of root growth and Zn uptake by wheat (Triticum aestivum var Columbus) from ZnCh and Zn-EDTA fertiliser bands when applied to a non-calcareous soil of pH 7.0, and low in DTPA extractable Zn. The Zn fertilisers were uniformly mixed with 200 g of soil contained in acrylic cylinders. Concentrations and forms of water soluble Zn in the fertiliser bands were determined from the incubation studies. Concentrations of Zn in the Zn-EDTA fertiliser bands were much greater than concentrations of Zn in the ZnCh bands. Whereas root growth was stimulated by low rates of Znch, high rates of Zn ( 0.8 mg Zn/cm3) resulted in a decrease in the amount as well as quality of roots recovered from the fertiliser band. Zn-EDTA reduced root growth into the fertiliser band for most of the rates of Zn applied. The results obtained showed that root growth into the fertiliser bands was closely related to the concentration of Zn in soil solution. Concentrations of Zn in the plant shoots increased with increase in the amount of roots in the fertiliser bands as well as the concentration of Zn in soil solution.
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