Variation in the relationship of bloom time petiole nutrient contents with yield in grape cv. Thompson Seedless and its clones

Abstract

nutritional survey was conducted to study the variation in the association of bloom-time petiole nutrient contents with yield in ‘Thompson Seedless’ and its clones, viz., ‘2A’, ‘Manik Chaman’, ‘Super Sonaka’ and ‘SSN’, the study showed that considerable variation existed in yield and nutrient contents among the cultivars/clones. Nutrients other than Mo in ‘Thompson Seedless’, NH4 - N, and Cu in Clone ‘2A’, Ca in ‘Super Sonaka’, and P and B in the cultivar ‘SSN’ were not correlated with yield. Non-significant and negative correlation is attributed to the interaction among the nutrients. Though, the correlation of individual nutrients with yield was poor, their combined effect was high. Nitrogen and Mg in ‘Thompson Seedless’; NH4 -N, P, Fe, and Zn in Clone ‘2A’; S and B in ‘Manik
Chaman’; N, NH4 -N, K, and Zn in ‘Super Sonaka’; and N, Ca, and Fe in ‘SSN’ were associated with reduced yields up to their respective vertex values related to minimum yields, beyond which, the relationship was positive. Such a relationship was attributed to the suppression of their positive effect at lower levels by the relative abundance of their respective antagonistic nutrients. The positive relationship of Mo in ‘Thompson Seedless’, Cu in Clone ‘2A’, Ca and Mg in ‘Super Sonaka’, and P and B in ‘SSN’ indicates the sub-optimal status of these nutrients in the respective cultivars. The results showed the nutrient-specific variation of the tested genotypes.