1 research outputs found
EVALUATION OF NITROGEN MONITORING, BUD FERTILITYAND âTHOMPSON SEEDLESSâ GRAPEVINE PRODUCTION ON DIFFERENT ROOTSTOCKS
<div><p>ABSTRACT Methods of nitrogen analysis were adopted in leaf tissues in the laboratory, nitrate content in the sap of petioles and chlorophyll relative index (CRI, in SPAD unit), as well as the evaluation of the buds fertility rates, production and qualitative aspects of cluster and berries of âThompson Seedlessâ vine, grafted on rootstocks âHarmonyâ, âJalesâ âPaulsen 1103â and âSO4â. The applied dose of N was 80 kg ha-1, and the experiment was installed in the SubmĂ©dio do Vale do SĂŁo Francisco, Brazil. The experiment was performed in a randomized blocks design, with four treatments and five replicates, with the experimental plot represented by five plants. In addition to the analysis of N, cluster length and width (cm) and fresh mass (g), berries length, diameter (mm), volume (mL), mass of fresh matter of berries, soluble solids (SS), titratable acidity (TA), SS/TA ratio, potential bud fertility (productive, vegetative, dead and dark buds in %) and real bud fertility (%). There were differences in nitrogen content in the leaves, nitrate in sap and CRI of âThompson Seedlessâ in relation to rootstocks. âThompson Seedlessâ expressed better potential for the development of clusters and berries when grafted on âHarmonyâ.</p></div