The effects of different level cluster tip reduction andfoliar boric acid applications on yield and yieldcomponents of alphonse lavallée grape cultivar

This study was conducted Alphonse Lavallée grape variety (Vitis vinifera L.) and its vine which was aged 7 was grown on 110 R rootstock in a vegetation period of 2016 in Akören district in Konya province. In this research, it was investigated whether the applications of Control (C), 1/3 Cluster Tip Reduction (1/3 CTR), 1/6 Cluster Tip Reduction (1/6 CTR), 1/9 Cluster Tip Reduction (1/9 CTR), 1/3 CTR+Boric Acid (BA), 1/6 CTR+BA, 1/9 CTR+BA on yield and yield components of Alphonse Lavallée grape variety. The results were obtained as the highest berry weight (5.23 g) with 1/9 CTR+BA and (5.32 g) with 1/9 CTR applications; the longest cluster (19.60 cm) with C application; the largest cluster (10.12 cm) with 1/6 CTR+BA and (10.42 cm) with 1/9 CTR+BA applications; the longest berry (21.46 mm) with 1/9 CTR; the highest pH (4.95) with 1/9 CTR+BA application; the highest TSS (17.53%) with 1/9 CTR+BA application; the highest titratable acidity (0.68 g/l tartaric acid) with 1/3 CTR+BA and (0.70 g/l tartaric acid) with C applications; as the highest maturity index (45.14) with 1/9 CTR application; as the highest must yield (673.33 ml/kg) with 1/6 CTR+BA, (686.67 ml/kg) with 1/9 CTR+BA, (693.33 ml/kg) with 1/3 CTR+BA, (703.33 ml/kg) with 1/6 CTR and (703.33 ml/kg) with 1/9 CTR applications; as the highest intensity of L* color (27.45) with C; as the highest intensity of a* color (1.37) with 1/9 CTR; as the highest intensity of b* color (-0.74) with 1/9 CTR+BA application. No significant effects were found statistically on fresh grape yield, cluster weight, berry width, berry length/berry width values. To increase berry weight with 1/9 CTR and 1/9 CTR+BA, maturity index with 1/9 CTR applications can be recommended in Alphonse Lavallée grape variety