The Dynamics of Immature Rubber Photosynthetic Capacities Under Macronutrients Deficiencies

Pará rubber produces natural latex which is essential for the industries. Rubber plant in immature phase prone to macronutrient deficiencies due improper management practices field and nature of plants that have sensitive physiological responses under stress conditions. The study aimed assess effect limitation on trees’ photosynthetic capacity growth. was pot-grown inside greenhouse with a completely randomized design experiment nutrient limitations used as treatments. treatments consisted 5 levels, namely, NPK; NP (-K); NK (-P); PK (-N); Control (-NPK). Photosynthetic parameters (Vc max: maximum rate RuBisCO carboxylation, Jmax: RuBP regeneration rate, TPU: Triose Phosphate Utilization), tree growth (plant height, flush number, leaf stem diameter), (N, P, K) concentrations were periodically measured. Welsch’s test (α = 0.05) continued Games-Howell pairwise comparison, followed by Pearson’s correlation polynomial regressions performed describe relationships. Results showed concentration corresponds given treatments, even though it above critical level rubber. N fertilization slightly reduced development such relative capacities. However, P K could not be observed clearly observation periods parameters. Furthermore, mobility nutrients from soil its translocation organs played more role Prolonged various clones deeply understand effects morphophysiological activities. HIGHLIGHTS conditions, Assessment how strive scarcity providing perspective compared K, activity GRAPHICAL ABSTRACT