A survey was conducted in the states of Maharashtra, Andhra Pradesh, Karnataka and Uttar Pradesh to study the present status of Mg in plants and soils of grape vineyards. The optimum Mg in petiole for the variety Anab-e-Shahi at bud differentiation stage (BDS) ranged from 0.24 to 0.58 per cent, and from 0.17 to 0.43 per cent at flowering stage (FS) by using Diagnosis and Recommendation Integrated System. For the variety Thompson Seedless optimum Mg ranged from 0.62 to 1.11 per cent at BDS and from 0.38 to 1.00 per cent at FS. The optimum Mg for the variety Perlette grown in Uttar Pradesh ranged from 0.17 to 0.27 per cent. The optimum available Mg in soils ranged from 1276 to 3009 mg kg−1 in grape-growing Vertisols of Maharashtra, 52 to 128 mg kg−1 in Inceptisols of Andhra Pradesh, 25 to 540 mg kg−1 in Alfisols of Karnataka and from 136 to 244 mg kg−1 in Entisols of Uttar Pradesh.
Magnesium, grape, DRIS
