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Mitigating magnesium deficiency for sustainable citrus production: A case study in Southwest China

文献类型： 外文期刊

作者： Wang, Yuheng 1 ; Long, Quan 2 ; Li, Yueyue 1 ; Kang, Furong 1 ; Fan, Zihan 1 ; Xiong, Huaye 1 ; Zhao, Huanyu 1 ; Luo, Yayin 1 ; Guo, Rui 8 ; He, Xinhua 1 ; Lakshmanan, Prakash 3 ; Shi, Xiaojun 1 ; Zhang, Fusuo 2 ; Zhang, Yueqiang 1 ;

作者机构： 1.Southwest Univ, Coll Resources & Environm, Chongqing 400716, Peoples R China

2.China Agr Univ, Coll Resources & Environm Sci, Beijing 100196, Peoples R China

3.Southwest Univ, Coll Resources & Environm, Interdisciplinary Res Ctr Agr Green Dev Yangtze R, Chongqing 400716, Peoples R China

4.Guangxi Acad Agr Sci, Sugarcane Res Inst, Nanning 530000, Peoples R China

5.Univ Queensland, Queensland Alliance Agr & Food Innovat, St Lucia, Qld 4067, Australia

6.Southwest Univ, State Cultivat Base Ecoagr Southwest Mt Land, Chongqing 400716, Peoples R China

7.Natl Monitoring Stn Soil Fertil & Fertilizer Effi, Chongqing 400716, Peoples R China

8.Danling Cty Agr & Rural Bur, Meishan 620200, Peoples R China

关键词： Citrus; Magnesium deficiency; Nutrient management; Sustainable production; Survey

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：4.342； 五年影响因子：4.342 ）

ISSN： 0304-4238

年卷期： 2022 年 295 卷

页码：

收录情况： SCI

摘要： Citrus is the biggest fruit crop in the world. Magnesium (Mg) deficiency is becoming a major limiting factor for sustainable citrus production globally, especially in China. Acidified soil, low Mg availability and poor nutrient management by small growers impact citrus fruit yield and quality, and its ecological environments. Grower surveys were therefore conducted to evaluate the extent and the underlying causes of Mg deficiency in the citrus orchards in Danling County, a typical citrus production county in Southwest China. A large, detailed citrus grower survey, along with soil and plant analyses, revealed that 73% of orchard soil and 93% of citrus leaf samples were Mg-deficient in the study region. Further, more than 50% of the local agrochemical technology providers did not identify citrus Mg deficiency symptoms. As a result, the orchard soil had negligible input of Mg (average 11 kg MgO ha(-1)), but received a large excess of nitrogen (average 712 kg N ha(-1)), phosphorus (average 364 kg P2O5 ha(-1)), and potassium fertilizers (average 565 kg K2O ha(-1)) annually. This unbalanced fertilization aggravated soil Mg depletion in 89% of citrus orchards. To rectify Mg deficiency, field experiments with crop nutrient demand and supply-based optimal nutrient management, including Mg application and reduced rates of NPK fertilizer (OPT+Mg), were conducted in two orchards over two cropping seasons. Compared with farmer practices, OPT+Mg treatment resulted in higher fruit yield (average 3.7 t ha(-1)), nutrient use efficiency, fruit quality and gross profit, with reduced environmental costs. In summary, this case study helped develop a social and technological strategy to mitigate Mg deficiency for profitable and sustainable citrus production in the major citrus producing region in China, and possibly in other counties with similar soil and environmental conditions.

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