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Walnut (Juglans regia L.), commonly known as Persian, Carpathian, or English Walnut is native to the Carpathian Mountains in Europe and grows eastward to the Himalayan Mountains and China. J. regia was introduced to California from Chile via Spain and is commercially grown along the Pacific Coast of the United States. To resist temperature fluctuations, there have been a number of cultivars developed and employed throughout the world.
Walnut trees prefer rich, sandy loam soils, about 2 meters deep with a pH ranging from slightly acidic to neutral. Walnut trees do not thrive in soils that have alkali salts and excess boron. It takes approximately 150 days from pollination for nuts to reach full size, with adequate soil moisture and fertility early in the season for maximum fruit size. When chemical fertilizers are used, fertilization usually occurs one time per year. Research has shown foliar feeding has supplemented soil applications. Generally, the lack of nitrogen (N) and zinc (Zn) have been the limiting factors maximizing walnut production. Sustainable methods of incorporating nitrogen have been the incorporation of compost, composted chicken manure, and the establishment of leguminous cover crops.
To check the fertility requirements of walnuts, a leaf tissue analysis should be taken on healthy midsummer foliage to determine nitrogen and zinc requirements. If additional zinc is required, galvanized nails or glaziers points can be driven in the large limbs or the tree trunk.
2 gallons of AGGRAND Natural Fertilizer and 1 gallon of AGGRAND Natural Kelp and Sulfate of Potash mixed with 100 gallons of water. Apply as a fine mist to thoroughly wet the foliage at bud break.
1 gallon of AGGRAND Natural Kelp and Sulfate of Potash mixed with 50 gallons of water, apply as a fine mist with enough solution to thoroughly wet the foliage twice more at two-week intervals.
Mix 1 pint AGGRAND Natural Fertilizer with 5 gallons of water and apply it around the base of each tree before bud break. (Increase mixture volume as the size of tree increases).
Apply 2 gallons AGGRAND Natural Fertilizer mixed in 50 to 60 gallons of water in the root zone around or between the trees. Apply in spring and/or fall if soil is hard or low in organic matter.
Rates vary according to soil fertility, cropping history, and other inputs that are available. Lower concentrations can be more effective than higher concentrations. Two or three lighter applications may be more effective than one heavy application. If other constraints only allow one trip over the field, do not exceed 4 percent dilution rate (4 gallons of AGGRAND to 100 gallons of water). Foliar apply AGGRAND in early morning or late afternoon/evening. The addition of a biodegradable surfactant increases uptake by increasing adhesion to the leaf surface.