Ammonium-Nitrate Ratio and Soil Moisture Jointly Regulate Early-Spring Nitrogen Acquisition Through Root Architectural Plasticity in Apple.
Early-spring nitrogen (N) acquisition in perennial fruit trees represents a critical physiological bottleneck determining vegetative-reproductive balance, as remobilized woody-tissue N supports initial growth but excessive depletion compromises reproductive performance. The interactive effects of N form (NH4+ or NO3-)...