ISHS Acta Horticulturae 563: International Conference on Environmental Problems Associated with Nitrogen Fertilisation of Field Grown Vegetable Crops
THE RELATIONSHIP BETWEEN CULTIVATION MANAGEMENT AND NITROGEN SUPPLY ON THE GROWTH OF WATERMELONS |
| Authors: | K. Murakami, Y. Araki |
| Keywords: | Citrullus lanatus, Lagenaria siceraria, sugar, glutamic acid |
| Abstract:
In order to develop quality control techniques for use under low input nutrient conditions, the relationship between cultivation management and the growth of watermelon was investigated using a 30% reduction in the nitrogen supply. The ex-perimental treatments consisted of two levels of nitrogen fertilization (200 kg/ha as standard, 140 kg/ha as a 30% reduction), two types of transplanted seedlings (un-grafted or grafted), the number of set fruit (one or two per plant) and the number of lateral branches (two or four per plant). Plant growth, glutamic acid content and fruit weight of ungrafted plants with 140 kg/ha nitrogen were inferior to those with 200 kg/ha nitrogen. Grafted plants with 140 kg/ha nitrogen were superior to those of ungrafted plants with 200 kg/ha nitrogen. Neither soluble solids nor the sugar con-tent was influenced by the kind of seedling. These result indicate that fruit yield and quality of watermelon was maintained by using grafted seedling even though fertil-izer was reduced by 30%. | |
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