关键词: 有机-无机肥配比, 琯溪蜜柚, 粒化, 产量, 土壤及叶片营养

Abstract: Both organic and mineral fertilizer at different ratios were applied to Guanxi honey pomelo orchard during 1995~1998, and their effects on juice sac granulation and dehiscent segments of fruit, yield and soil nutrients were studied. The results showed that compared with the sole mineral fertilizer, applying the combined organic fertilizer and mineral fertilizer effectively reduced the granulation of fruit, greatly increased the content of organic matter in soil and favored to improve the quality of fruit. Furthermore, mineral fertilizer combined with 50% organic fertilizer also significantly increased the yield of fruit. It was found that through balanced fertilization, a high yield of Guanxi honey pomelo fruit was achieved every year, and higher level of soil fertility and plant nutrition was held, while the granulation of fruit tended to decrease year by year. It is suggested that the annual application of 1.5kg N(with the organic forms from 30% to 50%) added with 1.0~1.5kg lime is available to a plant with 100kg yield of fruit in a red orchard, and its element proportion is:1.00:0.50~0.60:1.00-1.05:100~130:0.28.

Key words: organic-mineral fertilizer ratio, Guanxi honey pomelo, granulation, yield, nutrition in soil and leaf