本研究調查新竹縣新埔、關西、芎林及峨眉四個鄉鎮95處海梨桶柑果園的土壤狀況。土壤分析結果顯示多數果園之土壤屬於酸性到強酸性土壤，低於柑桔最適土壤酸鹼值（pH 5.0-6.5）的果園超過60%。表土中僅有60%果園的土壤含有2%以上的有機質，而在底土中則僅約40%。土壤中磷酐的含量大多偏高；而氧化鉀與氧化鈣的含量則偏低，其中以鈣的缺乏最嚴重。由土壤中鉀、鈣、鎂間的比例分析，鈣的量明顯偏低，而鉀、鎂的量則偏高。所有調查果園土壤均有根腐線蟲的存在，其危害的程度則需進一步調查。
A soil survey of ninety-five ”Hai-li” tangor orchards in Hsin-chu county was made in 1998 to 1999. The pH value of the soils obtained from about 60% of orchards were noted lower than the optimum range (pH 5.0-6.5) for orange growth. There were 60% of top-soils and about 40% of sub-soils that soil organic matter contents were above 2%. In most of the soil, available P content was too high, while available K and Ca were too low, especially available Ca. According to the ratio among Ca, K and Mg, Ca content was significantly lower than other two nutrients. Root rot nematodes were found almost in the soil of all the orchards. Further investigation of damage caused by nematode is also needed.
