Affiliation:
1. Education and Extension Organization (AREEO)
Abstract
Abstract
Balanced nutrition, especially under environmental stress have a great effect on improving the performance of fruit trees. Under such condition, establishing the leaf nutrient reference norms are essential to determining the nutritional balance in ‘Golden Delicious’ apple orchards. For this purpose, the leaf nutrient concentrations and yields of 81 commercial orchards were determined. The orchard's nutritional status was evaluated through the CND method and principal component analysis (PCA). The CND reference norms were calculated as V*N = 2.714 ± 0.183, V*P = 0.187 ± 0.091, V*K = 2.553 ± 0.043, V*Ca = 2.622 ± 0.075, V*Mg = 1.204 ± 0.045, V*S = 0.860 ± 0.089, V*Fe = -0.929 ± 0.173, V*Mn = -3.251 ± 0.147, V*Zn = -4.052 ± 0.332, V*Cu = -5.058 ± 0.208, V*B = -3.258 ± 0.059, V*Rd = 6.409 ± 0.050. According to PCA analysis, increment of the leaf S, Ca, B, N and Fe concentration in the low yielding subpopulation, respectively had a significant effect on the increasing of fruit yield in ‘Golden Delicious’ apple orchards. The reduction of global nutrient imbalance index (CND-r2) to below 17.64 can significantly increase the productivity of ‘Golden Delicious’ apple orchards in calcareous soil conditions.
Publisher
Research Square Platform LLC
Cited by
1 articles.
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