Soil Type
Potatoes prefer well aerated, loamy soil with good drainage. Soil Salinity, water logging and high levels of calcium-carbonate are undesirable for potato cultivation as they negatively affect productivity and starch content. Groundwater salinity and high potential evapotranspiration make soil salinization a major risk in many areas of Saudi Arabia.
Temperatures
Extremely hot summer temperatures reaching 50 °C and winter frosts in the mountains constitute the main constraints for production.
Water Requirements
All of Saudi Arabia is extremely arid with most of the country receiving less than 100mm rainfall annually. The location of potato crops and other cultivation is determined primarily by the availability of irrigation water, virtually all of which is pumped from underground aquifers. Major potato-producing areas are consequently located near well-established oases.
The traditional method of irrigation is furrow irrigation. Erosion caused by this method is one reason for a second ridging operation. Though furrow irrigation is still predominant, many farmers are experimenting with various overhead methods including sprinklers and central pivots. The timing and amount of irrigation are critical decisions for the farmer and depend on soil, weather conditions and the salinity of the irrigation water. In the spring, two to four irrigation applications are generally required before emergence. When the foliage is well developed, farmers irrigate every five or six days. In the autumn season irrigation begins immediately after planting and must be repeated frequently until after emergence to keep soil temperature low.
Nutrition Requirements
Soil should be subjected to analysis for nutrient availability in order to develop an appropriate fertilization scheme.
Harvesting Period
Harvesting twice a year. The spring crop is harvested in April/ May; the autumn crop is harvested in late December.
Harvesting Methods
Most of the potato crop cultivation in Saudi Arabia is mechanised. About ten to fourteen days before harvest, the foliage is either cut by hand or sprayed with a defoliant. Small-scale farmers harvest by hand, but elevator diggers or fully automatic harvesting machines are used on large farms. Yields of 30-35 t/ha are common.
Planting Period
Like their counterparts in many areas of the Middle East, Saudi farmers grow crops of potatoes twice yearly. The first crop is planted in January; the second in September/October.