Articles
RESEARCHES ON IRON CHLOROSIS OF APRICOT
The content of total and active CaCO3 and mobile iron (F.F.E.) was made responsible for this physiological disease of grape vine, these-being used to calculate the index of soil chlorosis capacity (I.P.C.) and the resistance scale of rootstock chlorosis (Drouineau, 1942; Galet, 1947; Gîta et al., 1967; Juste and Pouget, 1972: Rauta et al., 1980; Callot and Jaillard, 1980).
Research on fruit trees showed differentiated sensitivity to iron chlorosis depending on species, variety and rootstock; pear grafted on quince, peach on franc, cherry on wild cherry and apple on M 16 and M 4 are less resistant.
Unlike grape vine, the sensitivity of fruit trees to iron chlorosis is differentiated and depends on the fruit variety (Demolon and Bastisse, 1944; Marcel, 1951; Walace, 1951; Gouny et al., 1953; Butijn, 1956; Liveront, 1960).
As concerns the apricot, it is unanimously admitted that this species resists to iron chlorosis.
It seems that when particular physical and chemical conditions occur in the soil species is also threatened by the iron chlorosis.
There aspects should be cleared when studying the factors inducing the iron chlorosis of apricot:
- Elaboration of some particular biometric indices expressed numerically and having a high degree of sensitivity chlorosis.
- Analytical determination of those soil properties playing a role in the chlorosis occurrence.
- Specification of soil horizons or soil column bringing about the chlorosis.