| Pak. J. Bot., 34(4): 351-354, 2002 | Back to Contents | ||||
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Updated: 24-05-12 | ||||
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Effects of zinc, nitrogen and temperatures on
seedling growth of rice S.M. Alam, Muhammad Ali and Ejazul Islam Abstract: A water culture experiment was conducted to examine the effects of Zn (ZnSO4, 7H(2)O @ 0.0, 2.5 and 5.0 mg/L); N (NH4SO4 @ 0.0, 25 and 50 mg/L) and variable temperatures (33degreesC and 38degreesC) on seedling growth of rice cv. Khushboo. The leaf tip burn and yellowing of green leaves were observed irrespective of zinc and nitrogen treatments and both low and high temperatures. Such deficiency symptoms were prominent at higher temperature and high levels of Zn and N. The shoot and root lengths and fresh and dry weight of shoots increased in the presence of Zn @ 2.5 mg(-1) + 25 mg(-1) of N at lower temperature whereas the fresh and dry weights of root decreased in the same treatment. At higher temperature, the root and shoot lengths and their fresh and dry weights decreased more at higher Zn and N treatments. The seedling growth decreased at higher temperature along with higher levels of Zn and N, whereas at lower temperature (33degreesC) with Zn @ 2.5 mg(-1) and N @ 25 mg(-1), the growth normally increased. |
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