Evaluation of Low Yielding Vines of Thompson Seedless for Nutrient Indices By Dris Analysis

Beaufils’ Diagnosis and Recommendation Intergrated System (DR1S) was employed to assess the nutrient imbalaces in relation to poor yields in Thompson Seedless vine plots receiving varying levels of N and K₂O. Bloom time petiole nutrient contents of 32 plots of two vines each yielding more than 20 kg/vine were used to develop norms to evolve the nutrient indices of seven plots yielding less than 15 kg/vine. Low K and high P indices were associated with low yielding ones. The non-bearing of P index and the synergistic bearing of Mg and N indices with that of K on fruit yield are discussed.