19, 4 Reinking and Groff: Siamese Seedless Pummelo 433 
cent of salt. The soil in the Bang Bakok region showed only 
a normal sodium chloride content, between 0.18 and 0.83 per 
cent. 
The presence throughout the greater part of the year of a large 
amount of salt in the irrigation water, and consequently in the 
soil, of the Nakorn Chaisri region at Ban Mai seems to have a 
direct relation to the quality of fruit produced, and may have 
some relation to its seedlessness. The fruit produced in the 
Bang Bakok district, where the water is less salty throughout 
the year, is inferior in quality and very seedy. 
The cultural methods used in the best pummelo sections of 
Siam are well adapted to the low, wet, mud flats and nipa 
swamps of the region. The raised-bed methods followed are 
very largely those employed by the Chinese in the successful 
plantations of the flood-swept delta regions of southern China. 
The seedless pummelo trees flower and fruit throughout the 
year, but in most abundance four times each year. The largest 
number of flowers appear in June, at the beginning of the rainy 
season; from this lot of blossoms is produced the largest crop, 
ripening in November. The fruit in this crop is reported to 
have seeds. During the rest of the year no seeds, or only small, 
abortive ones, are produced. The fruit is well suited to storage 
and shipping. Records of storage and shipments covering a 
period of from six to eight months have been made. The fruit 
will remain in excellent condition for two or three months. 
The Kao Pan, or Nakorn Chaisri, pummelo has a well-rounded, 
usually low-headed, shapely tree. In form, shape of leaf and of 
fruit, and size and shape of oil cells, it somewhat resembles 
an orange. It is, however, a true pummelo. The fruit is fleshy, 
very juicy, white, and has a delightfully sweet, mildly acid 
flavor. It is probably the best of the pummelo types. 
The Nakorn Chaisri seedless pummelo is extremely delicate 
and, consequently, apt to be severely attacked by canker and 
other diseases and pests. The tree needs constant attention and 
care, but with such care excellent results can be obtained. 
Salting and cultural practices seem to have a direct relation 
to the quality of the fruit produced and possibly some relation 
to the seedlessness. 
The relation of seedless fruit to pollination was not fully de- 
termined. The soil and meteorological conditions may be factors 
in the production of excellent-quality fruit. 
