تلخیص
Eleven rice varieties were tested in a pot culture study for their sensitivity to low soil Zn and Cu . Absence of applied Zn orCti delayed maturity of rice plants. Maximum delay occurred in variety NR1 as it failed to mature without Zn or Cu application even after 6 weeks delay. In general, plants matured earlier where Cu was applied than that of control as well as the Zn treated plants. Mutant NRI was most sensitive to low Zn followed by NlAB-6> DM-25> Basmati-Super> Basmati-Pak= Basmati-198= IR-6> Basmati-385 > Basmati-370. Varieties Kashmir Basmati and KS-282 were not sensitive to Zn deficiency. In case of Cu stress also, NR-1 was most sensitive followed by NIAB-6> IR-6> DM-25> Basmati Super> Basmati-Pak> Basmati-38S> Basmati-198. Varieties Basmati-370, Kashmir Basmati and KS-282 were not sensitive to Cu stress. In control, all the varieties contained similar, though statistically different, micronutrient concentrations i.e., 18-23 mg Zn kg'1 and around 5 mg Cu kg'. Therefore, differential response of varieties to micronutrient fertilization could be attributed to their differential Zn and Cu requirement.
Muhammad Aslant Kausar' . (1998) DIFFERENTIAL SENSITIVITY OF ELEVEN RICE VARIETIES TO LOW SOIL ZINC AND COPPER, The Journal Soil & Environment , Volume 14, Issue 14(1-2).
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