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90 华 中 农 业 大 学 学 报 第 41 卷

［16］ 雷靖 . 不同钙镁配比对柚果实产量、品质及钙镁吸收的影响 45（in Chinese with English abstract）.
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［17］ 秦煊南 . 喷施硼锌镁对提高锦橙产量和果实品质的影响［J］. 西 ence，2015，32（1）：63-68（in Chinese with English abstract）.
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Effects of magnesium fertilizer on yield and quality
of satsuma mandarin fruit

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LIU Xiaoman ,LIU Xiaodong ,LIU Yan ,TAN Qiling ,HU Chengxiao ,WU Songwei ,XIE Heping 2
1. College of Resources and Environment/Hubei Provincial Engineering
Laboratory for New-Type Fertilizer/Microelement Research Center，
Huazhong Agricultural University，Wuhan 430070，China；
2. Comprehensive Experiment Station of Mandarin in Yichang of Hubei Province，
Yichang 443140，China

Abstract 20-year-old satsuma mandarin trees in Yiling District，Yichang City，Hubei Province were

used to study the effects of Mg fertilizer on the components of sugar and acid in pulp，the value of color dif⁃
ference and content of pigment in peel at the stage of fruit color changing and fruit maturity of satsuma
mandarin to balance the rational application of magnesium fertilizer in citrus and improve the internal and
external quality of citrus fruit.Five magnesium fertilizer levels were set as 0，100，150，200，and 250 g
MgO per plant，denoted as CK，T1，T2，T3，and T4.The results showed that magnesium application signif⁃
icantly increased the content of magnesium in leaf at the stage of fruit expansion compared with no magne⁃
sium application.Mg fertilizer significantly increased the yield of satsuma mandarin fruit.The yield of fruit in⁃
creased first and then decreased with the increase of Mg fertilizer dosage. In 2019 and 2020，the yield of
fruit was the highest at 124 g and 122 g MgO per plant，respectively.Magnesium fertilizer increased the con⁃
tent of sucrose in the pulp at the stage of fruit color changing.Mg application significantly increased the val⁃
ue of L，a，b and C in peel，significantly reduced the H value，the content of chlorophyll a，chlorophyll b and
total chlorophyll in peel.The brightness，chroma and purity of peel was improved.However，there was no
significant impact on the content of sugar and acid in pulp，the value of L，a，b，C and the content of chloro⁃
phyll in peel at the stage of fruit maturity.The results of principal component analysis showed that the over⁃
all internal and external quality of fruit in T2，T3 and T4 treatment was better，while the quality of fruit in
T4 treatment was the best at the stage of fruit coloring.It is indicated that the recommended magnesium ap⁃
plication rate for the highest fruit yield and better quality of satsuma mandarin is 122-150 g MgO per plant，
and the recommended magnesium application rate for fruit quality of satsuma mandarin is 200-250 g MgO
per plant.
Keywords satsuma mandarin；Mg fertilizer；Mg deficiency；yield；fruit quality；peel coloring

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