Abstract
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 5 kg Zn amended with 10t compost /ha. Keyword - Oryza, Zinc Sulphate, Organic Manure, Organometallic Complexes, Calcerous soil
Highlights
Among different micronutrients, the deficiency of zinc is widespread in Indian soil [2]
The plant samples were washed in acidified detergent solutions, rinsed in distilled water and dried in oven at 65oC. the plant samples were pulverized in a waring blender, digested in tri- acid mixture [6]The initial soil sample collected at the start of the experiment was analyzed for some important characteristics [3]Available Zn was extracted with
The grain yield response obtained due to amendment of 2.5 kg Zn with 50 q farm yard manure (FYM)/ compost was equivalent to 5kg Zn/ ha application
Summary
The deficiency of zinc is widespread in Indian soil [2]. Micronutrients delineation in soils and plants revealed that 70 to 80% soils in calcareous belt are deficient in available zinc (Anonymous, 198081) where apparent zinc deficiency symptoms have been observed on several field crops [7]. Increasing demand of zinc sulphate to migrate the zinc problem is leading a continuous rise in its price. It was felt necessary to enhance the efficiency of native and applied Zn in such soils where Zn availability is an obstacle. The present investigation was initiated to study the direct and residual effect of zinc and amended organic manure on crops grown in succession
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