三峡重庆库区甜橙叶片矿质营养丰缺状况调查

 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。

Orange Leaves Nutrient Status of the Three Gorges Area in Chongqing

Knowing leaves nutrient status is a basis to formulate a suitable fertilization strategy.Orange leaf samples aged four to six months collected from 200 orange orchards in 5 main producing counties were analyzed to learn the leaves nutrient status of the Three Gorges area in Chongqing.The results showed that the tested leaves suffered sharp nutrients imbalance.N and Fe content were very high;P,Zn,and Mo content were appropriate;K,Ca,Mg,Cu and Mn content were respectively low and B content was at a serious sh...