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Zinc deficiency in rice and wheat

In India, Y.L. Nene was the first scientist to report Zn deficiency in rice at G.B. Pant University of Agriculture and Technology, Pantnagar in 1966. The symptom of Zn in rice were brown spots in the top leaves to begin with followed by almost complete rust browning of leaves. Because of this rust brown colour the disease was named as 'Khaira'. Zn being a less mobile nutrient, most of the deficiency symptoms is in young leaves at the growing point. Physiologically, Zn deficiency can adversely affect the leaf chlorophyll content, stomatal conductance and net photosynthesis. Because of this in some cases the Zn deficiency symptoms in some crops such as maize may be confused with Fe deficiency which also produces yellowing or whitening of leaves. Wheat plants show dusty brown spots on upper leaves of stunted plants, shoot growth is more inhibited than root growth, tillering decreases, spikelet sterility increases, midrib becomes chlorotic particularly near the leaf base of younger leaves, leaves lose turgor and turn brown in blotches and streaks appear on lower leaves.

 
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