THE CHOICE OF VEGETABLE VARIETIES FOR DIFFERENT SEASONS IN THE U. A. R.
Production rose likewise from 2,540,000 tons in 1957 to 5,140,000 tons in 1968. Table 1 gives the figures for acreage and production of some important vegetables in the years 1939, 1950, 1959, and 1967. This increase in quantity is accompanied by greater effort to improve the quality of the produce, although much greater emphasis has to be given to the handling and presentation of the commodities. Due to many factors, the yield per area has been fairly stable during this period.
In general, temperature, light and water resources are quite favourable for growth and development of vegetables most of the year. Growing-seasons extend and overlap. For this reason also very often more than one crop is grown on the same land the same year. Consequently far less than the total acreage mentioned is occupied with vegetables based on area utilization. Basically, the climate should be conducive for winter production of vegetables lending the country a good export potential and also ability to furnish the local market with a good supply all the year round.
For practical reasons one may partition UAR vegetable production in three main planting seasons: winter planting (October-December), summer planting (February-March), autumn planting (August-September).
The distribution of the crops on the various seasons is given in Table 2 and also in Diagram 1.
Table 3 presents climatological normals for some important vegetable areas of the UAR for the years 1901–1945. Alexandria, with coastal climate has the most stable climate on a yearly base as well as the least daily variation. The mean daily minimum temperature and mean daily maximum temperature during January are 10.6°C and 18.5°C respectively at Alexandria, while 10.1 and 23.5°C at Aswan. For the month of August the same figures are 23.6°C and 30.4°C at Alexandria and 26.4 and 41.1°C for Aswan.
The mean daily minimum temperatures at Alexandria and at Aswan during the winter are considerably higher than at the three other locations quoted in the table. This gives these locations good potentials for winter production. Aswan has some advantages still, having a more sunny climate and the temperature increases rapidly from March on. Therefore,