Direct and residual effect of zinc and zinc amended organic manures on the zinc nutrition of field crop

Shelley Gupta¹, Kalpana Handore^2
1PGMCOE, Wagholi, Pune
²P.G.M.C.O.E., Wagholi, Pune, India

Received : -     Accepted : -     Published : 21-12-2009
Volume : 1     Issue : 2       Pages : 26 - 29
Int J Agr Sci 1.2 (2009):26-29
DOI : http://dx.doi.org/10.9735/0975-3710.1.2.26-29

Keywords : Oryza, Zinc Sulphate, Organic Manure, Organometallic Complexes, Calcerous soil
Conflict of Interest : None declared

Zinc (Zn) deficiency is the most widespread micronutrient disorder in rice (Oryza sativa) The objective of this paper was to examine alternative evaluation methods and to identify the most informative traits that would provide realistic information for rice breeders and to map quantitative trait loci (QTLs) associated with tolerance The most severe symptom in the field was high plant mortality. Zinc interfered with translocation of iron from roots to above ground parts of Glycine max. (L.) Merrill var. Hawkeye. During periods in which zinc impeded iron translocation, it also suppressed the production of reductant by roots. Addition of iron, as a ferric metal chelate (iron ethylenediaminedihydroxyphenylacetic acid), to the growth medium overcame the interference of zinc. In the root epidermis, potassium ferricyanide formed a precipitate (Prussian blue) with ferrous iron derived from the previously supplied iron ethylenediaminedihydroxyphenylacetic acid. The reduction of ferric iron was suppressed by zinc. In a field experiment on silt loam calcareous soil, the direct and residual effect of zinc and zinc amended organic manures were studied on rice (Oryza sativa L.) followed by barley (Hordeum vulgare L.) and rice respectively. Visual Zn deficiency symptoms were observed on rice in on zinc plots. Application of zinc significantly increased the crop yield. The magnitude of yield response was intensified where zinc was applied in conjunction with organic manures. The highest Zn uptake in these three crops was recorded at kg Zn amended with 10t compost /ha.

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