春见柑橘营养元素含量的年周期变化规律研究OA

To explore the annual cycle variation law of nutrient element content in'Harumi'citrus and provide guidance for subsequent scientific fertilization,leaf and fruit samples of'Harumi'citrus were collected at different times to determine the content of 10 nutrient elements,and their variation laws and correlations among various elements were analyzed.The results showed that from February to January of the following year,the contents of N,K,Ca and Mg in leaves showed a variation trend of decreasing first,then increasing and then decreasing;the variation trends of B and Cu were opposite to that of N;and the contents of P and Fe showed a trend of decreasing first and then increasing.From June to January of the following year,the macro and medium elements in fruits showed a trend of increasing first and then decreasing,while the trace elements showed a decreasing trend.Correlation analysis showed that elements such as Ca and Cu in leaves were more likely to show significant correlations with other elements;Ca and Fe in leaves showed an extremely significant positive correlation(p<0.01),and Cu and Mg showed an extremely significant negative correlation(p<0.01).All elements in fruits basically showed positive corre-lations.Most of the nutrients between leaves and fruits showed negative correlations,such as Mg in leaves and Fe and Zn in fruits.However,the correlations between P in leaves and fruits and other elements were not significant(p>0.05).Combined with the phenological period of'Harumi'citrus,in actual production,attention should be given to the supplementation of trace elements such as B,Fe,Cu,Mn and Zn during the flowering and young fruit stages;attention should be given to the supple-mentation of N,K,Mg and Ca during the fruit enlargement stage;and appropriate supplementation of P should be noted during the quality formation stage.