Regulation effects of bioorganic fertilizer on sunflower seedlings growth and leaf physiological indices under salt-alkali stress.
2011, 30(04):
682-688.
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1180 )
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A pot experiment was conducted to study the effects of different dosages (0%, 2%, 4%, and 8%) bioorganic fertilizer on the seed germination, emergence rate, seedling growth, and leaf physiological indices of sunflower under salt-alkali stress. As compared with the control, after 7-28 days under salt-alkali stress (T0), the seed germination rate and emergence rate decreased markedly, seed emergence delayed for 3 days, seedlings shoot- and root length, shoot- and root fresh weight, and leaf chlorophyll and soluble protein contents decreased significantly (P<0.05), and the roots were much more sensitive than the shoots. As compared with T0, after the application of 2% (T1), 4% (T2), and 8% (T3) bioorganic fertilizer, the seed emergence rate increased by 564% (P<0.05), 643% (P<0.05), and 857% (P<0.05), respectively, and the seed emergence advanced by 2-3 days. After 7 days under salt-alkali stress, the seedling growth in treatments T1, T2, and T3 had an obvious increase, leaf chlorophyll content increased by 24.4% (P<0.05), 27.2% (P<0.05), and 33.2% (P<0.05), and leaf soluble protein content increased by 34.4% (P<0.05), 43.6% (P<0.05) and 48.8% (P<0.05), respectively. When the treated duration prolonged from 7 to 28 days, the inhibitory effects of salt-alkali stress on the seedling growth and the leaf chlorophyll and soluble protein contents in treatments T1, T2, and T3 decreased to some extent. These results indicated that applying 2%-8% bioorganic fertilizer could obviously alleviate the inhibitory effects of salt-alkali stress on the seed emergence, seedling growth, and leaf physiological indices of sunflower.