Walnut trees grow up strongly and the roots go deeper in medium-fine texture, clayed, sandy soils, and rich in organic matters.
Silt layer with clay, alluvium, and pebble that limits the depth of the root, water accumulation, and sand accumulations may limit the growing strength and size of the walnut trees.
250-300 cm of soil depth is ideal for the walnut trees obtained through grafting works in Turkey. However, the soil depth of 100-150 cm, in which 75% of water and nutrient intake occurs, should not be compromised.
Soil with High pH and Limestone; The suitable pH value in soil is about 6 to cultivate walnut. Attention is paid to the selection of acidic and basic fertilizer in order to keep pH value at optimum level. When pH value is above 8, then it may cause deficiency of phosphor, iron, zinc, and boron. 5% active lime may cause iron chlorosis in walnut cultivation.
The most suitable places for establishing walnut garden should be the places, which are a little higher that the territory surrounding it and have good air flow, in terms of land forms. As the cold air flows from top to the downwards, frost risk is very less in such places. Frost risk may occur on lower bases or stream beds and the water hardness of the stream bed in spring may have negative impacts on the flowers that are newly blooming.
After deciding on the facility of Walnut Garden, it is important to know the soil characteristics of place, which is considered to establish a covered garden on it, and to analyse the soil. In walnut cultivation, a soil pH of 6-7.0 and İŞBA (water holding capacity) value of 45-55% is favourable.
We must have the soil analysis conducted at authorized laboratories absolutely before establishing a walnut garden.