Evaluation of nutrient concentrations and photosynthetic indices of apple leaves ‎under different soil management and fertilization

Document Type : Full Paper


1 Ph. D. Candidate, University College of Agriculture and Natural Resources, University of Tehran, Karaj, ‎Iran

2 Associate Professor, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran‎

3 Associate Professor, Soil & Water Research Institute (SWRI), Agricultural Research, Education and ‎Extension Organization (AREEO), Karaj, Iran

4 Assistant Professor, Soil & Water Research Institute (SWRI), Agricultural Research, Education and Extension Organization ‎‎(AREEO), Karaj, Iran


Effective nutrition of fruit trees with the least input can significantly help in the optimal use of chemical fertilizers and reduce costs. On the other hand, the type of soil management also plays an undeniable role in the ability of plant roots to access nutrients. Therefore, three-year study (2017, 2018 and 2019) was carried out to evaluate the effect of soil management type (conventional tillage and no-tillage) and fertilizer type (control, hydrogel, complete fertilizer, complete fertilizer + hydrogel and humic acid) on photosynthetic indices and leaf nutrients in apple Delbar Estivale grafted on the base of MM106 located in Kamalshahr, Karaj county. The results showed that the highest percentage of leaf nitrogen (2.74%) was observed in conventional tillage ×hydrogel treatment and the lowest percentage of leaf nitrogen (2.14%) was observed in conventional tillage ×hydrogel treatment. The highest percentage of leaf phosphorus (0.22%) belonged to conventional till treatment in 1398, while the lowest percentage of leaf phosphorus (0.18%) belonged to conventional tillage treatment in 2019. The highest leaf copper (40.4 mg.kg-1 dry) belonged to the triple interaction of hydrogel and no- tillage in 2019. Also, the lowest leaf copper (9.9 mg.kg-1 dry) belonged to the triple interaction of humic acid and conventional till in 2018. In general, it seems that the positive effects of no-tillage in orchard are not achievable in the short term and the transition stage from conventional tillage to no-tillage must be completed.


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