Journal
SCIENTIA HORTICULTURAE
Volume 241, Issue -, Pages 57-64Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scienta.2018.06.083
Keywords
Newhall navel orange; Ground cover; Deficit irrigation; Fruit quality; Yield
Categories
Funding
- National Natural Science Foundation of China (NSFC) [31470408]
- National Key R&D Program of China [2018YFD0201500]
- Fundamental Research Funds for the Central Universities [XDJK2016A012]
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In order to reduce unwanted negative effect of frequent rainfall in spring and high-temperature in summer on fruit yield and quality of Newhall navel orange trees in Chongqing Three-Gorges Reservoir area. In this study, the influence of Tyvek(.) nonwoven materials ground cover (TC) and with different irrigation density 110% (ID110), 60% (ID60), and 0 (ID0) of the local evapotranspiration (ETc) on yield and fruit quality were evaluated during three consecutive years (2015-2017) in a commercial Newhall navel orange drip irrigated orchard. During spring frequent rainfall period, all TC treatments had a significant higher in leaf sucrose content and leaf starch content during flower bloom period due to their significantly increased the leaf ACO(2) exchange parameter compared to CK group. As a result, the highest in the number of fruit bearing (FBN) was obtained in TC + ID60 group due to its 84.6% and 13.5% higher the total flower number (TFN) than CK and TC + ID110 groups, respectively. However, the TC+ID110 and TC+ID0 groups had a significantly lower FBN due to their significantly 38.3% and 19.9% rate of dropped flowers (FLDR) compared to TC + ID60 group. During summer high temperature period, the leaf water potential significantly decreased in order: TC + ID110, TC + ID60 and CK, TC+ID0, which resulted in the significant higher ACO(2) and transpiration rate in TC+ID110 and TC + ID60 groups, and significant lower ACO(2) and transpiration rate in TC+ID0 group. Consequently, there was a significant increase of total soluble solids, titratable acid, vitamin C in fruit internal quality and a, b, a/b value in fruit external quality, and a significant decrease of juice yield in fruit internal quality and fruit shape index, and weight per fruit with increasing water stress as compared to TC+ID110 group. In conclusion, TC + ID60 treatment can reduce the negative effect of frequent rainfall spring and high summer temperatures and improve the fruit yield and quality of Newhall navel oranges.
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