By definition, permanent crop is one produced from plants which last for many seasons, rather than being replanted after each harvest. Permanent crops are perennial trees, bushes or vine crops like citrus, apples, blueberries, nuts or grapes. Although it represents a small segment in agriculture, some 11 percent (over 1.5 billion ha) of the globe’s land surface (13.4 billion ha), it plays an important role in shaping the rural landscape and helping to balance agriculture within the environment.
Because of high costs, planting permanent crops is considered to be a “high stakes” farming operation. Today, success is imperative. Permanent crop producers must minimize risk as much as possible to ensure successful crop establishment. As with most other high-risk farming operations, it is important to plan ahead. Planning ahead not only improves the chances of successful permanent crops establishment, but also greatly reduces the amount of personal worrying after it has been planted. Establishment depends on the complex interaction over planting time, soil, climatic, biotic, machinery and management factors.
Natural conditions (climate, relief, soil) are fundamental factors that determine the choice for the establishment of permanent crops with economically justified production. According to Trent, certain fruit varieties can be grown in the following altitudes:
Increase in altitude changes temperature conditions. Thus, for every 100 m above sea level, median annual temperature decreases by 0.5-1 ° C, and the vegetation period by 7-10 days. It’s best to raise wineyards and orchards on the hilly terrain to the south, southwest or southeast exposure that provide good insolation of orchard, and consequently a higher sugar content.
Besides properly selected and prepared field for achieving high and quality yields, it is necessary to ensure optimum supply of all nutrient elements throughout the period of the growing season and also select rows direction. The most convenient row direction is the north-south. Rows should be placed in direction to rationalize all works: tillage, fertilization and protection. On sloping ground rows direction must be set so as to reduce erosion processes.
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