南靖地处南亚热带,大部属红壤丘陵山地,具有发展柑桔等亚热带果树生产的优越生态条件,许多自然条件理想的柑园已取得高产稳产优质的经济效果。然而,生态条件的某些因素(诸如水湿、温热、土壤等)在局部地区对柑桔生长结实仍存在不同程度的不利影响,必须予以改造,方能充分发挥柑桔的生产潜力。南靖种苗场于1964年垦植丘陵地柑园约90亩,由于立地条件较差,多数果园虽属缓坡丘 Located in the southern subtropics and most affiliates of red soil hills and mountains, Nanjing enjoys superior ecological conditions for the development of subtropical fruit trees such as citrus. Many citrus orchards with ideal natural conditions have achieved high-quality, stable and high-quality economic results. However, some factors of ecological conditions (such as water wetness, warmth, soil, etc.) still have different degrees of unfavorable effects on the growth and fruiting of citrus in some areas and must be modified so as to fully realize the production potential of citrus. Nanjing seedlings field in 1964 cultivated hilly citrus orchard about 90 acres, due to poor site conditions, although most of the orchard is gentle slope mound