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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。
Papaya fruit tumor due to boron deficiency. Through field application of boron prevention and cure of the disease test and determination of diseased plants, healthy plants of the strong leaves, young leaves, flowers (ovary), young fruits, fruits and seeds near the determination of boron, confirmed affirmed. After comparing the normal value and lacking value of healthy, diseased and healthy young leaves, young leaves and fruits, the content of boron in the fourth to fifth leaflets was fully used as the basis for rational fertilization. At 20.56 ~ 50.74ppm, the plant behaved normally. 6.53 ~ 16.55ppm, the occurrence of tumor fruit disease. Therefore, when its boron content of 16.55ppm ~ 20.56ppm, it is necessary to immediately apply boron fertilizer. The amount of total boron in soil appears to have little to do with the appearance of oncogenesis. In the case of sufficient water-soluble boron fertilizer, the content of boron in flower (ovary), young fruit and nearly mature fruit of papaya is all at 24 (soil 1) ppm level. Due to the rapid development of sweet papaya fruit batch, in order to maintain the normal fruit development, we must continue to learn from the outside boron. When flower (ovary), young fruit and fruit boron content were 8.41, 9.41 and 5.16ppm, there will be fruit tumor disease. Before the flowering of plants, each hole is boric acid or borax two grams, can effectively prevent the disease.