oa Agrochemophysica - Boron nutrition of dunflowers (Helianthus Annuus L.) on an Avalon medium sandy loam

Volume 8, Issue 1
  • ISSN : 0302-7112



Boron deficiency symptoms in field-grown sunflowers were observed and descriptionbed. Applications of up to 10 kg borax/ha increased seed yields by 38% but an application of 30 kg borax/ha resulted in no further yield increase. In this study, B played a role in the reproductive rather than in the vegetative phase of growth. It was concluded that the level of B in the plant tissue could be used as a means of establishing the status of B nutrition in the sunflower plant. In month-old seedlings, 23 ppm B was considered deficient, 55 ppm B adequate and 93 ppm B possibly excessive for normal growth. In the topmost, mature leaf at flowering, these levels were, respectively, 10, 47 and 103 ppm B and in the seed, 11, 16 and 18 ppm B. Soil amelioration with Hme or gypsum decreased the B concentration in the seedlings only where 30 kg borax/ha was applied. Soil amelioration had no effect on the B concentration in the topmost, mature leaf but, in the seed, liming resulted in a slight increase in B concentration.

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