3 个塔罗科血橙品种矿质营养元素的年周期变化规律.

【Objective】The present paper aimed to study the annual dynamic changes and correlations of mineral nutrients in three ‘Tarocco’ blood orange varieties, namely ‘Tarocco blood orange new series’, ‘Tarocco blood orange No.8’ and ‘Tarocco blood orange No.9’, to understand their nutrient absorption patterns and provide theoretical basis for scientific fertilization of blood orange.【Method】The leaves of three blood orange varieties collected in different months throughout the year were used as materials to determine the dry matter rate, total N, total P, total K, Ca, Mg, total B, Fe, Cu, Zn, Mn contents. The contents of each nutrient element in fruits were determined during the fruit ripening period, to analyze the absorption pattern and correlation between the content of nutrient elements in leaves and fruits.【Result】In the leaves, dry matter rate overall showed ‘Tarocco blood orange No.8’ ＞ ‘Tarocco blood orange No.9’ ＞‘Tarocco blood orange new series’. The changes patterns of total B, Fe and Cu were similar. The time when the Fe content of ‘Tarocco blood orange No.9’ reached its maximum value (78.30 mg/kg) was 60 days earlier than the other two varieties. The changes of total K content was opposite to that of total B and Cu, which was manifested as low at maturity stage and young fruit stage, and high at fruit enlargement period and color changing period. There were differences in the variation rules of total N, total P, Ca, Mg, Zn and Mn among the three varieties. In fruits, ‘Tarocco blood orange No.8’ had the highest dry matter rate, total N, total P, total K, Ca, Mg, total B, Cu and Mn content, while ‘Tarocco blood orange No.9’ was the lowest. Correlation analysis showed that the total N content was extremely significantly correlated with Ca, B, and Cu content in leaves (P＜0.01, the same as below), while the correlation between total P and the content of each element was not significant (P＞0.05). The dry matter rate was extremely positively correlated with the content of total P, total K, Ca, Mg, B, Cu, and Mn in fruits, while Zn content was extremely negatively correlated with dry matter rate, the contents of total P, total K, Cu, Ca, Mg, total B, and Mn. The contents of total K, Fe, Zn, and Mn in leaves were significantly or extremely negatively correlated with the contents of total P, total K, Ca, Mg, total B, Cu, and Mn content in fruits.【Conclusion】In the early stages of fruit development (flowering period to young fruit period), N, P, K compound fertilizers and Ca, B, Fe, Mn fertilizers should be mainly applied. In the late stages of fruit development (from fruit enlargement period to maturity period), attention should be paid to supplementing P and K fertilizers, as well as micro fertilizers such as Ca, Mg, Cu, Zn, and balancing the application of N fertilizer. [ABSTRACT FROM AUTHOR]