红麻虽属自花授粉作物,但在繁种生产中常出现自然杂交株,难以保持品种的特性和纯度。丘荣熙(1986)观察到红麻萼片背腹两面均存在蜜腺,开花时分泌蜜汁招引昆虫。鉴于红麻植株一般高达数米,要想通过设置屏障来达到安全隔离是非常困难的。笔者曾于1986～1987年作了红麻自然杂交率的测定试验,结果如表1。 Although kenaf is a self-pollination crop, natural hybrids often appear in the breeding production, it is difficult to maintain the characteristics and purity of varieties. Qiu Rongxi (1986) observed nausea on both sides of the kenaf sepals are nectary, flowering, honey secreted secret insect. In view of kenaf plants generally up to several meters, to set up barriers to achieve safety isolation is very difficult. The author once in 1986 ~ 1987 made kenaf natural hybridization rate test, the results shown in Table 1.