- Author: ZHU Panpan, LI Youfang, QIU Jieya, WANG Min, ZHANG Chaobo, LING Lili, SHI Yunting, HU Junhua, ZHANG Rong, LI Yongqi, ZI Liling, PENG Liangzhi
- Keywords: Citrus; Yuxi city; Soil nutrient elements; Leaf nutrient elements; Correlation;
- DOI: 10.13925/j.cnki.gsxb.20190240
- Received date:
- Accepted date:
- Online date:
PDF （） Abstract（）
Abstract: 【Objective】In recent years, benefiting from its natural advantages and climatic conditions,Yuxi city of Yunnan province has become an important citrus production area with plateau characteristics in China. In 2017, there were 147 700 hm2 citrus planting areas in Yuxi with a yield of 280 000 tons, accounting for 33% and 39% of the total fruit planting area and yield of the city, respectively. For a long time, fertilization in citrus production in Yunnan has mainly relied on farmers' experience, and N, P, K were mainly applied, neglecting the supplement of Ca, Mg and Zn fertilizers and organic manures. The differences in soil physical and chemical properties and nutrients in Yuxi citrus production area directly affected the absorption and distribution of soil nutrients by trees, and also affected the yield and fruit quality. Therefore, in this study, both soil and leaf samples were collected and their nutrient elements were quantitatively determined in the main citrus production areas of Yuxi city. The aim was to study the relationship between soil and leaf nutrient elements and to provide a theoretical basis for citrus rational fertilization.【Methods】Both soil and leaf samples of Satsuma mandarin, Bingtang sweet orange and Orah mandarin were selected and collected from 101 orchards in four representative main producing areas: Huaning Nanpanjiang river valley area(HNRV), Huaning mountain area(HNM), Yuanjiang river dry-heat valley area(YJRV) and Xinping mountain area(XPM). Ten essential mineral elements in soils and leaves were determined and analyzed.【Results】The proportions of soil alkaline hydrolytic N in an insufficient level in HNRV,HNM, YJRV and XPM reached 77.08%, 63.64%, 91.67%and 80.00%, respectively. The insufficiency of soil available P in HNM was the severest, which accounted for 100%; and in other three ecological areas the soil available P was mainly in an adequate level(≥optimum range). The proportions of soil available K in an adequate level in the four areas reached93.75%, 100%, 83.33% and 96.67%, respectively. The content of soil exchangeable Ca was mainly in an adequate level, but exchangeable Mg was mainly in an inadequate level(