Relative susceptibility of selected rice varieties to zinc deficiency in relation to utilisation of different pools of soil zinc from calcareous soil

Sakal, R.; Verma, M.K.; Singh, A.P.

Annals of Agricultural Research 10(3): 243-248

1989


Accession: 001931078

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Abstract
In pot trials with 5 rice cultivars grown in a calcareous sandy loam soil given 0, 5 or 10 p.p.m. Zn as zinc sulphate, Zn deficiency symptoms were absent in cv. UPR-238, severe in cv. Sita and Pusa 2-21 and intermediate in cv. Rajendra Dhan and Ratna. The different forms of soil Zn existed in dynamic equilibrium with each other. Highly susceptible cultivars such as Bita and Pusa 2-21 mostly depended for their Zn nutrition on water soluble and exchangeable forms of soil Zn. The tolerant cv. UPR-238 extracted substantial amounts of Zn from complexed and organically-bound forms under Zn deficiency conditions. The difference in Zn uptake between susceptible and tolerant cultivars was much larger in Zn-deficient soil than in soil given Zn.