崇明区温州蜜柑园土壤和叶片营养元素丰缺状况分析

为分析上海崇明区温州蜜柑园土壤有效养分、叶片矿质元素含量的测定以及营养状况，提供科学施肥的理论依据。对研究区30个温州蜜柑园进行土壤和叶片调研取样，测定土壤和叶片矿质营养元素含量，与推荐指标进行对比，确认了土壤和叶片营养状况丰缺状况。结果表明：崇明区温州蜜柑园土壤整体偏碱，pH平均值为7.78；土壤碱解氮、有效磷、以及有效锰处于缺乏或低量水平的温州蜜柑园分别占83.3%、97.3%、90.0%，其余土壤营养元素整体处于适宜或高量水平；温州蜜柑园叶片钾、钙和锌含量缺乏的占比分别为80.0%、60.0%和100.0%；叶片氮含量处于过量水平的温州蜜柑园占比80.0%，其余元素含量整体处于适宜水平；对比土壤养分与叶片养分发现土壤交换性钙、交换性镁的含量情况与叶片中对应元素显著正相关，其余的营养元素无明显的相关性。针对上海崇明区温州蜜柑园土壤整体缺碱解氮、有效磷以及有效锰的情况，土壤管理需要考虑增加氮肥、磷肥投入以及锰肥补施，土壤过量但叶片缺乏的元素例如钙、锌考虑叶面喷施的施肥方式进行补充。

Analysis of nutrient abundance and deficiency of soil and leaves in Wenzhou mandarin orchard, Chongming district

To provide a theoretical basis for scientific fertilization in Chongming district, Shanghai, by measuring the effective soil nutrients, the measurement of mineral element content of leaves and nutritional status. Soil and leaf survey and sampling were carried out in 30 Wenzhou mandarin orange orchards in Chongming District, Shanghai, and the mineral nutrient content of soil and leaves was determined, and the nutrient status of soil and leaves was confirmed by comparing with the recommended indicators. The results showed that: the soil of Wenzhou mandarin mandarin orange garden in Chongming district, Shanghai was alkaline overall, with an average pH of 7.78, and 83.3%, 97.3% and 90.0% of the soil alkali hydrolysis, available phosphorus and effective manganese were at the lack or low levels of Wenzhou mandarin orange garden in Chongming district, Shanghai, and the remaining soil nutrient elements were overall at appropriate or high levels. The proportion of potassium, calcium and zinc deficiency in leaves of Wenzhou mandarin orange orchard was 80.0%, 60.0% and 100.0%, respectively. 80.0% of Wenzhou mandarin orange orchards had excessive nitrogen content, and the content of other elements was at an appropriate level. Comparing soil nutrients