Abstract:

30 samples of grapefruit (mainly white variety of Guanxi pomelo), and corresponding samples of soil and leaves were collected from the representative fruit orchards of Xiaoxi, Nansheng, Wuzhai and Banzai in Pinghe, Fujian, and the quality of fruit and the nutrient contents of soil, leaf and fruit were analyzed. The results showed that more than half of the orchard soil samples were strongly acidic, pH < 4.50; the organic matter content was in a suitable range, but the available phosphorus content was too high, the maximum value was 155.7 mg/kg. The contents of medium and trace elements, especially calcium and magnesium, did not reach the rich level. The contents of total phosphorus, iron, copper and boron in the leaves were high, and the contents of phosphorus and iron in 30 orchards were higher than the suitable range. The contents of potassium, magnesium and zinc were the opposite. The highest contents were 1.32%, 0.22% and 8.37 mg/kg, respectively, which belonged to the state of deficiency. The single fruit weight ranged from 0.675 to 1.850 kg (except 2 grapefruit samples), and showed a positive correlation with soil pH. The difference of edible rate was 27.83%, and the main range was concentrated between 75% and 85%. The solid-acid ratio was quite different, with a difference of 12.35. The maximum Vc content was 28.63 mg/100 g. In general, it is suggested that local orchards should reduce the application of phosphorus fertilizer and copper pesticide, increase the application of potassium, calcium and magnesium fertilizer, to increase soil pH, promote the absorption and utilization of fertilizers, and reduce environmental pollution while ensuring fruit quality.

Key words: Guanxi Pomelo, Soil, Leaf, Nutrient Content, Fruit Quality