Mechanism of improved phosphate uptake efficiency in banana seedlings on acidic soils using fertigation

文献类型： 外文期刊

第一作者： Pan, N.

作者： Pan, N.;Shen, H.;Wu, D. M.;Deng, L. S.;Tu, P. F.;Gan, H. H.;Liang, Y. C.

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关键词： Available phosphate;Conventional fertilization;P fractions;P sorption index;Root activity;Root distribution

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：4.516； 五年影响因子：5.12 ）

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收录情况： SCI

摘要： a- Fertigation increased soil available P and decreased the P sorption index. a- Fertigation increased the concentrations of soil Al-P, Fe-P and occluded-P. a- Fertigation decreased soil pH value. a- Fertigation increased root activity and root distribution in surface soil. a- Improved P uptake efficiency was due to increased root activity and P availability. Fertigation improves nutrient uptake efficiency greatly, while the mechanism of increased nutrient uptake efficiency remains unclear. In this study, the effects of conventional phosphate (P) fertilization (by mixing fertilizer with soils) and fertigation (by dissolving fertilizer in water) on P uptake were compared in banana (Musa sapientum) seedlings. Results indicated that, compared with conventional fertilization, fertigation increased the concentration of available P by 108% and decreased the P sorption index by 31% in the 0-8cm surface soil of banana roots. Fertigation enhanced the transformation of different P fractions, increased the concentrations of aluminum-bound P (Al-P), iron-bound P (Fe-P) and occluded-P (O-P), and decreased the pH value by 0.3 units. However fertigation did not influence the activity of acid phosphatase, but increased microbial biomass and root activity by 25.5-67.8%. Furthermore, fertigation increased the root distribution in the 0-8cm soil layer by 7.8-9.4% compared with conventional fertilization. These results suggest that fertigation increases P uptake efficiency as the result of increased root activity, root distribution, microbial biomass and reduced P sorption index in the surface soil of banana seedlings.

分类号： S2

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