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为了解三峡重庆库区甜橙叶片矿质营养丰缺状况,2009年对库区5个甜橙主产县200个甜橙园4～6月龄营养性春梢叶片营养元素进行了分析测试。结果表明,三峡重庆库区甜橙叶片营养明显失衡,N和Fe含量很高,P、Zn和Mo比较适宜,K、Ca、Mg、Cu和Mn含量较低,而B含量严重不足。叶片N、P、K、Ca和Mg的平均含量分别为(27.34±5.92)、(1.40±0.21)、(11.00±3.04)、(25.27±8.53)和(3.34±0.89)g·kg-1,Fe、Cu、Mn、Zn、B和Mo的平均含量分别为(125.00±40.55)、(5.38±2.59)、(33.69±6.33)、(34.30±17.91)、(23.68±14.24)和(0.79±0.49)mg·kg-1,且N和Fe处于高量及以上水平的比例分别为39.5%和53.0%,P、Zn和Mo在适宜范围的比例分别为75.5%、83.5%和70.5%,K、Mn和Mg处于低量水平的比例分别为50.3%、37.5%和20.0%,B、Ca、K、Cu在低量及以下水平的比例分别为76.5%、64.0%、57.3%和51.0%。库区大部分橘园叶片B含量严重不足,生产上需要重视补充B肥;同时生产上需根据甜橙叶片营养诊断结果,适量补充Ca肥和K肥,以满足柑橘营养平衡施肥。
In order to understand the status of mineral nutrition abundance of sweet orange leaves in the Three Gorges Reservoir area of Chongqing, nutrient elements in four to six months of vegetative spring shoots of 200 sweet orange orchards in 5 sweet orange producing counties in the reservoir area were analyzed and tested in 2009. The results showed that the nutrient contents of sweet orange leaves in the Three Gorges Reservoir area were obviously unbalanced. The content of N and Fe was very high, P, Zn and Mo were suitable, K, Ca, Mg, Cu and Mn were low, while B was not enough. The average contents of N, P, K, Ca and Mg were (27.34 ± 5.92), (1.40 ± 0.21), (11.00 ± 3.04), (25.27 ± 8.53) and (3.34 ± 0.89) g · kg- The average contents of Fe, Cu, Mn, Zn, B and Mo were (125.00 ± 40.55), (5.38 ± 2.59), (33.69 ± 6.33), (34.30 ± 17.91), (23.68 ± 14.24) and (0.79 ± 0.49 ) mg · kg -1, and the proportions of N and Fe at the high level and above were 39.5% and 53.0%, respectively. The proportions of P, Zn and Mo in the proper range were 75.5%, 83.5% and 70.5%, respectively. K, The proportions of Mn and Mg at low levels were 50.3%, 37.5% and 20.0%, respectively. The proportions of B, Ca, K and Cu were 76.5%, 64.0%, 57.3% and 51.0% at low and below levels, respectively. In the area, the content of B in most orangery leaves is seriously insufficient, and B fertilizer needs to be emphasized in production. At the same time, the nutrition diagnosis results of sweet orange leaves should be added according to the diagnosis results of appropriate amount of Ca fertilizer and K fertilizer to meet the nutrition balance fertilization of citrus.