Risposta dello zolfo e del fosforo nel sistema colturale fagiolo mungo - riso
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La salute del suolo � diventata motivo di preoccupazione per la produzione agricola sostenibile nel nuovo millennio. L'uso di fertilizzanti ad alto tenore, l'elevato assorbimento di zolfo da parte delle colture in regime intensivo e la mancata reintegrazione dello zolfo hanno contribuito a diffondere carenze di zolfo su vasta scala. Sono state segnalate carenze di zolfo in 72 paesi del mondo. Lo zolfo svolge un ruolo importante nella fissazione dell'azoto, influenzando la nodulazione attiva nei legumi e, nonostante il fabbisogno relativamente basso di zolfo del riso, la produttivit� di questi cereali di base pu� essere drasticamente ridotta da un apporto inadeguato di zolfo. Lo zolfo ha la capacit� di apportare benefici a pi� di una coltura in sequenza grazie alla sua significativa risposta residua. L'applicazione di dosi pi� elevate di fosforo (60 kg P₂O₅/ha) e l'aumento dei livelli di zolfo fino a 40 kg S/ha si sono dimostrati i migliori per migliorare la crescita, i caratteri che determinano la resa e la resa in granella del fagiolo mungo. Livelli variabili di fertilit� residua e la dose basale di azoto applicata hanno migliorato significativamente la resa del riso e i suoi attributi. I dati di ricerca contenuti in questo libro lo rendono un utile riferimento per ricercatori, studenti universitari e post-laureati in agricoltura e per la comunit� agricola.
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