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AICRP on Sorghum, MPKV, Rahuri

PI: Dr U D Chavan

A. External application of Iron and Zinc on grain micronutrient content

An experiment was conducted using seven popular rabi sorghum cultivars to study the effect of external application of iron and zinc on growth as well as grain micronutrient status. Iron and zinc was applied to soil or applied as foliar spray at two critical growth stages. For soil application, FeSO4 @ 25 Kg/ha + FYM or Cow dung slurry 1:4 ratio (125kg fresh cow dung + 500 L/ha water) and ZnSO4 @ 20 Kg/ha + FYM or Cow dung slurry 1:4 ratio (125kg fresh cow dung + 500 L/ha water) were incubated for one week and applied after 30 DAS with irrigation. Foliar spray was taken up with chelated Fe (0.1%) and chelated Zn (0.1%) at two critical growth stages (at panicle initiation - 30DAS and at boot stage - 45 DAS). Observations were recorded on grain yield and related agronomic traits. No significant difference was observed between the treatments compared to control as well as among the cultivars for economic traits. However, the soil application of iron and zinc has resulted in higher mean values for plant height, panicle length, panicle weight, seed weight and 100-seed weight indicating the response of cultivars for external application of micronutrient fertilizers. Soil application at 30 DAS was more beneficial compared to foliar spray as evidenced by higher mean values.

No significant difference was observed for proximate composition between the control and soil application of iron and zinc as well as foliar spray. Grain micronutrient analysis is under progress at IIMR.

B. Micronutrient content in the grains and food products

The popularly cultivated seven rabi sorghum cultivars and their products were analysed for iron and zinc content for confirmation of previous results. In the whole grains Phule Anuradha and Phule Rohini recorded high iron (11.1 mg/100g and 10.6 mg/100g, respectively) content while Phule Suchitra recorded high zinc (2.08 mg/100g) content. There was no significant loss or gain for iron and zinc content in the products compared to whole grains. The experiment will be repeated with another set of products to confirm the results.

 


 

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