📊 Scara BBCH — Castan comestibil

Cultură / taxon: Castan comestibil · Castanea sativa Mill.

Rol agronomic: MSU states nutrient management in chestnut is unique and should be based on soil testing, annual leaf analysis and tree growth observations.

Mod de aplicare: —

Condiție de aplicare: Michigan Chestnut Management Guide: well-drained soil, pH 5.0–6.5; optimum P, K, Ca and Mg levels are not known for chestnut. It also states there is no precedent for foliar N applications in its guidance.

Obiectiv: Evitarea falsei precizii și a foliarului substitut pentru sol.

Risc descris: Pragurile nespecifice sau schemele istorice nu trebuie tratate ca validate Castanea.

Cultură / taxon: Castan comestibil · Castanea sativa Mill.

Rol agronomic: Because chestnut flowers late spring/early summer, spring N may influence current flower-bud strength more than in many spring-flowering fruit crops.

Mod de aplicare: 600–1000 L/ha

Condiție de aplicare: MSU guide explains timing of N can influence vegetative growth and possibly flower-bud strength due to chestnut's later flowering; its recommendations are based on soil-applied N.

Obiectiv: Creștere și fertilitate florală fără supra-N.

Risc descris: Concluziile despre N sunt de sol, nu justifică echivalent foliar.

Cultură / taxon: Castan comestibil · Castanea sativa Mill.

Rol agronomic: Sampling must occur before terminal growth stops; late N can delay nut/wood maturation.

Mod de aplicare: 700–1100 L/ha

Condiție de aplicare: MSU sampling protocol: collect leaves from current-year growth before terminal growth stops (typically before early August in Michigan); late summer N may delay fruit development and woody-tissue hardening.

Obiectiv: Umplere și maturare fără creștere tardivă.

Risc descris: Late N can increase cold injury and delay maturation.