【摘要】 番木瓜果实瘤状病由于缺硼引起。通过田间施硼防治瘤状病试验和对病株、健株的壮叶、嫩叶、花(子房)、幼果,近成熟果实和种子含硼量的测定,得到肯定的证实。在比较健、病株壮叶、嫩叶、果实的正常值和缺乏值(出现病状时含量)之后,提出:以完全展开的第4～5片壮叶的含硼量作为合理施肥的依据。在20.56～50.74ppm时,植株表现正常。6.53～16.55ppm时,果实发生瘤状病。故当其含硼量在16.55ppm～20.56ppm时、就要即时施用硼肥。 土壤中的全硼量似乎与瘤状病出现关系不大。在水溶性硼肥供应充足的情况下,番木瓜的花(子房)、幼果、近成熟果含硼量均在24(土1)ppm水平。由于香木瓜果实成批迅速发育,为维持果实正常发育,要不断的从外部吸取硼素。当花(子房)、幼果及果实含硼量分别为8.41,9.41和5.16ppm,就会出现果实瘤状病。在植株开花前,每株穴施硼酸或硼砂两克,能有效的预防该病发生。更多还原

【Abstract】 Deficiencyof Boron causes the lumpy fruit disease of papaya (Corfco papaya Linn. ) . This has been proved by field experiments on application of Boron in controlling the lumpy fruit disease as well as by analyses of Boron contents of papaya seede of ripening fruits , young fruits, flowers ( ovary ) , and leaves ( young and matured ones ) . Based on comparison of the difference between the normal Boron content and the Boron deficient conetnt of shoot, leaf and fruit.we recommena Boron applications as a suitable measure of papaya fertilization,when the Boron contents of the 4th and 5th leaves (vigorous and fully developed) are found to have 16. 55-20. 56 P. P. m. This is the right time to apply Boron to the plant as fertilizer.There is nocorrelation between the appearance of lumpy fruits and the total Boron content of the soil. In the case of ample supply of Boron to the papaya plant. The Boron contents of flower (ovary) young fruit and the ripening fruit all attain the level of 24 (± 1) P. P. m. But during the fast development of clusters of fruits on the papaya plant. A continuous flow of Boron into each fruit is necessary to maintain its normal growth and developmaent. Thus, when the Boron content of flower , young fruit and matured fruit decreases to 8.41, 9.41 and 5.16 P. P. m. respectively . The appearnce of warty fruit symptoms would occur.更多还原