Advisor(s)
Abstract(s)
Establishing a fertilization plan for large trees is particularly difficult due to the high soil volume that the roots exploit and the
buffer effect of the perennial woody structure on the concentration of nutrients in the leaves. This work evaluates the response of
chestnut, a very large tree, to different fertilizer solutions. The study was conducted in two chestnut orchards planted in acid soils
that were subjected to the application of lime plus phosphorus (Lime+P), lime plus a compound NPK fertilizer (Lime+NPK), and
an unfertilized control (Control). The effects of the treatments on soil properties, nutritional status and photosynthetic performance
of the trees, and nut production, were assessed from field and laboratory analyses. Liming significantly increased soil pH
and exchangeable calcium (Ca). Treatments did not significantly influence leaf P and K levels, although leaf N concentrations
were significantly higher in the Lime+NPK treatment on two of the three sampling dates. In one of the trials, the average
accumulated nut yield was higher in the Lime+NPK (71.7 kg tree−1) treatment compared with the control (59.6 kg tree−1) and
the Lime+P (51.7 kg tree−1) treatments, although without significant differences at P < 0.05. Overall, the results show the
chestnut tree to be a species tolerant of soil acidity. The results also show that the buffer capacity of the plant in regulating the
nutrient concentration in the leaves seems to be higher for P than for N, and therefore, concentrations of N in the leaves require the
regular application of the nutrient as a fertilizer.
Description
Keywords
Chlorophyll fluorescence NDVI Nut yield Plant nutritional status Soil acidity SPAD readings
Pedagogical Context
Citation
Rodrigues, M. Ângelo; Raimundo, Soraia; Pereira, Abel; Arrobas, Margarida (2020). Large chestnut trees (Castanea sativa) respond poorly to liming and fertilizer application. Journal of Soil Science and Plant Nutrition. ISSN 0718-9508. p. 1-10