![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
Abstract
Almond nutrition by foliar analysis has been studied in 54 greenhouses during two years. Leaves were sampled monthly throuhout the biologic cycle.
Fructification percentage was closely related to yields. Evolution of micronutrients in the time and physiological equilibrium: Fe‐Mn‐Zn and Fe‐Mn‐Cu was similar among greenhouse and this was not influenced by sampling time and therefore it can be considered a constant. Iron index declined strongly during the some period and showed that iron was deficient during the initial stages of plant growth.
The highest yields were obtained when the nutrient and binary ratios of leaf levels were following: Fe = 569–610 ug.g–1; Mn = 293–321 ug.g–1; Zn = 101–107 ug.g–1; Cu = 64–70 ug.g–1; Fe/Mn = 2.65–2.94; Fe/Zn = 2.93–3.59; Fe/Cu = 4.10–7.33; Mn/Zn = 2.33–2.64; Mn/Cu = 7.39–8.82; Zn/Cu = 2.83–3.31.
On the other hand the best yields were related to following equilibrium: Fe‐Mn‐Zn = 50–36–14 and Fe‐Mn‐Cu = 53–31–16.
We tentatively propose and Iron index of .541‐.633.
Key words: