Effect of flowering regulating chemicals and girdling on winter flushing, yield and fruit quality in Litchi cv. China

Pragya Kumari, Sanjay Kumar Singh, Sanjay Vyas

Abstract


A study was conducted on effect of various bio-regulators and girdling on winter flushing, flowering intensity, fruit yield and quality of litchi cv. China. The experimental results revealed that winter flushing was inhibited by girdling (removal of bark at 3mm width in 75 % branches] and application of paclobutrazol (PBZ). The number of floral panicles per tree was highest due to spray of KNO3 and prohexadione-Ca (207.50 and 206.17 respectively), while least in control trees (109.16). The fruit retention, average fruit weight was insignificant amongst the treatments. Spray of KNO3 during September end, led to highest yield in terms of number of fruits per tree (2,427) and in weight (55.42 kg per tree). The control trees had only 35 fruit per tree (i.e., 0.80 kg per tree). KNO3 also led to highest pulp percent (65.35 %) of the fruits. Spray of salicylic acid caused highest fruit ascorbic acid (29.26mg/100g pulp) and highest total sugar (22.4 %) of the fruit. Besides lowest yield, the least pulp content (50.61 %), total anthocyanin content (6.15 mg per 100 g pulp), total sugar (11.80 %) and reducing sugar (9.03 %) were observed in control trees. The highest TSS (22.60° Brix) and TSS/acidity ratio (66.97) of the fruits were recorded in paclobutrazol applied trees while least titratable acidity was found after spray of prohexadione-calcium. Thus, spray of KNO3 (2.0 %) was able to record highest yield and pulp content in litchi cv. China while salicylic acid @ 2000 ppm application was found very effective for improving fruit quality attributing characters. Girdling and spray of prohexadione- Ca in litchi tree can also be an effective intervention for yield enhancement


Keywords


Bio-regulators Litchi, fruit drop, quality, girdling, KNO3, prohexadione-Ca, salicylic acid,

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References


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