|Almond (Prunus dulcis [Mill.] D.A. Webb var. dulcis)|
French: Amandier; Spanish: Almendro; Italian: Mandorlo; German: Mandelbaum
Perennial. Harvested part: nuts
Plant analysis data
In California, Zn is a common problem.
Almonds are sensitive to excessive salts, especially of Na (leaf Na 0.30 % or more) and of Cl (leaf Cl 1.79 % or more).
In California, B toxicity (leaf B 87 ppm or more) and deficiency both present problems.
Present fertilizer practices
Almonds may be grown in cultivated or sod culture, so it may or may not be practicable to incorporate fertilizer into the soil. Fertilizer is usually given in a single dressing, sometimes in autumn, or, if in spring, then before bud-break. In general only N is applied annually, preferably as ammonium sulphate on alkaline soils or as ammonium nitrate on acid soils. P is preferably applied as triple superphosphate, and K as sulphate.
When supplying Zn as a foliar spray in mid-season, only ZnO should be used; ZnSO4 burns the foliage.
In USA the basal fertilizer is:
45-112 kg/ha N.
1.2 t K2O when problem occurs (California soils).
2 kg/ha B when problem occurs.
Zn deficiency is controlled by sprays of 19-29 g ZnSO4/l in the dormant period and by foliar sprays of 6 g ZnO/l applied in mid-season.
BROWN, J.W.; WADLEIGH, C.H.; HAYWARD, H.E.: Foliar analysis of stone fruit and almond trees on saline substrates. Proc. Amer. Soc. Hort. Sci. 61, 49-55; USA (1953)
HANSEN, C.J.; KESTER, D.E.; URIU, K.: Boron deficiency symptoms identified in amonds. Calif. Agr. 16(4), 6-7; USA (1962)
KESTER, D.E.; URIU, K.; ALDRICH, T.: Copper deficiency in almonds and its response to treatment. Proc. Amer. Soc. Hort. Sci. 77, 286-294; USA (1961)
PROEBSTING, E.L.; SERR, E.F.: Edible nuts. In: CHILDERS, N.F. (ed.), Nutrition of fruit crops. Horticultural Publications, New Brunswick, NJ; USA (1966)
WEIMBAUM, S.A. et al.: Nitrogen fertilization increases yield without enhancing blossom receptivity in almond. HortScience 15, 78-79, USA (1980)
Author : D. Sparks, College of Agriculture, The University of Georgia, Athens, USA