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| Effects of plant growth regulators on fruit drop and quality of Qiongzhong green orange |
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| DOI：10.16768/j.issn.1004-874X.2017.11.006 |
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| Abstract: |
| In order to study the effects of plant growth regulators on fruit drop and quality of Qiongzhong green
orange，six kinds of plant growth regulators were sprayed on the leaves before the first and second physiological
fruit drop. The fruit drop rate of green orange was investigated pre-harvesting and the fruit quality was detected
after fruit ripening. The results showed that six kinds of plant growth regulators affected the fruit drop and quality
on varying degrees. The fruit drop rate was 11.73% after spraying Huaguoling，followed by Lv-fengbao and Antifalling
element’s 24.84% and 26.96%，respectively. Both were superior to other treatments and control on fruit drop
preventing. About the effects of six treatments on the exterior parameters，the weight and size of fruits were improved， while the thickness of peel was reduced. The fruit weight of Huaguoling treatment was the largest，reaching 139.0 g，
22.47% higher than that of the control. The thickness of peel of Lv-fengbao treatment was the least，which was 2.60
mm，35.96% lower than that of the control. The L value and b value of Lv-fengbao treatment were 57.32 and 47.16，
respectively，significantly higher than those of other treatments and control. In terms of intrinsic quality，treatments
except for Lv-fengbao treatment，reduced the content of soluble solids in juice and increased the content of acid，
and the content of vitamin C was significantly higher than other treatments and control after spraying Quanshuguo and
Gibberellic acid. Taking together，the treatments of Anti-falling element and Lv-fengbao were better than the others
on fruit drop preventing，and had no negative effect on quality，and therefor could be used as the effective substitute
for Gibberellic acid. |
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