They are needed by the plant throughout the entire period of growth in an enclosed space, in which, in contrast to an open bed, nutrients do not get from the external environment.
Waxay u baahan yihiin geedka inta lagu jiro muddada koritaanka oo dhan meel bannaan oo ku xiran, taas oo ka soo horjeeda sariirta furan, nafaqooyinka kama helin jawiga dibedda.