福鼎四季柚与地质背景相关性研究

A STUDY OF CORRELATION BETWEEN FUDING ROUND - THE - YEAR SHADDOCK AND GEOLOGICAL SETTING

福鼎四季柚是柚类中的一个特殊品种，品质优良。其传统种植区除具有优越的自然地理条件外，其地质背景为白垩系中酸性（英安质、流纹质）火山碎屑岩，为作物提供了较丰富的Ca、Mg、Na、Zn、Mn等营养元素．有利于四季柚的生长。经研究了解了四季柚对多种化学元素的需求，初步确定了四季柚种植土壤元素有效态的适宜含量范围并提出了扩种的最佳地区。做了初步施肥试验，为配方施肥提高抽果产量和品质提供了依据。

Fuding round-the-year shaddock is a good-quality special species of shaddock. Besides favorable naturalgeographical conditions, its traditional growing areas are geoligically characterized by Cretaceous intermediate-acid(dacitic and rhyodacitic) pyroclastic rooks, which provide fairly rich nutritive elements such as Ca, Mg, Na, Zn andMn for crops and hence are favorable for the groWth of round-the-year shaddock. Through investigation, the requirements of round-the-year shaddock for varied chemical elements were found out, the suitable content range of effective state of elements in soils that grow round-the-year shaddock was tentatively determined, and the best areasfor further growing round-the-year shaddock were indicated. The preliminary fertilizer-applying test has providedgrounds for application of fertilizer in accordance with made-up prescriptions, which helps to raise both output andquality of shaddock fruits.