TITLE:
Enhanced Efficiency Phosphorus Fertilizer Impact on Physiological Characteristics of Coffee Seedlings
AUTHORS:
Roberto dos Anjos Reis Jr., Gustavo Pazzetti, Douglas Ramos Guelfi
KEYWORDS:
Efficiency Use, Policote, Net Photosynthetic Rate
JOURNAL NAME:
Advances in Bioscience and Biotechnology,
Vol.14 No.12,
December
11,
2023
ABSTRACT: The effects of phosphorus (P) nutrition on various
aspects of photosynthetic metabolism have been examined for coffee plants (Coffea arabica) grown under greenhouse
conditions. The experimental design was completely randomized, and the
treatments were carried out in a 2 × 5 factorial scheme: two P sources [Triple
Superphosphate - TSP (46% P2O5) and Policote coated TSP -
TSP + Policote (43.7% P2O5)] and five P rates (0; 5; 10;
15 and 20 g P2O5 plot-1), with three
replications. The net photosynthetic rate (A), the leaf temperature (LT), the
atmospheric CO2 concentration (Ca), the stomatal conductance (gs),
the transpiration rate (E), the substomatal CO2 concentration (Ci)
and carboxylation efficiency (Ce) were measured in the youngest fully expanded
leaf, with the use of an infrared gas analyzer. All photosynthesis measurements
were affected by P fertilization. P fertilization increased net photosynthetic
rate, leaf temperature, substomatal CO2 concentration, stomatal
conductance, transpiration rate, and carboxylation efficiency. Policote coated
P fertilizer resulted in a higher net photosynthetic rate, leaf temperature,
stomatal conductance, and transpiration rate than conventional P fertilizer.
The data indicated that Policote coated P fertilizer, a kind of enhanced
efficiency P fertilizer (EEPF), alters the plant’s photosynthetic carbon
metabolism, explaining higher crop development and yield resulted from this
EEPF.