کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2025021 1542638 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Intercropping promotes the ability of durum wheat and chickpea to increase rhizosphere phosphorus availability in a low P soil
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
پیش نمایش صفحه اول مقاله
Intercropping promotes the ability of durum wheat and chickpea to increase rhizosphere phosphorus availability in a low P soil
چکیده انگلیسی

Cereal–legume intercropping can promote plant growth (i.e. facilitation) through an increase in the amount of phosphorus (P) taken up, especially in low P soils. The aim of this study was to test the hypothesis that these positive interactions are supported by rhizosphere processes that increase P availability, such as root-induced pH changes. In neutral and alkaline soils legumes are assumed to increase inorganic P availability by rhizosphere acidification due to N2 fixation which benefit to the intercropped cereal. Growth, P uptake, changes in inorganic P availability and pH in the rhizosphere of intercropped species were thus investigated in a greenhouse pot experiment with durum wheat and chickpea either grown alone or intercropped. We used a neutral soil from a P fertilizer long-term field trial exhibiting either low (−P) or high (+P) P availability. Phosphorus availability was increased in the rhizosphere of both species, especially when intercropped in −P. Such increase was associated with alkalization. Rhizosphere pH changes could not fully explain the observed changes of P availability though. Low rates of N2 fixation may explain why no rhizosphere acidification was observed. Increases in P availability did not lead to enhanced P uptake but growth promotion was observed for durum wheat intercropped with chickpea in −P soil. Our hypothesis of an increase in inorganic P availability in intercropping as a consequence of root-induced acidification by the legume was not validated, and we suggested that root-induced alkalization was involved instead, as well as other root-induced processes. Thus, the cereal through rhizosphere alkalization may also enhance P uptake and growth of the intercropped legume. Facilitation can thus occur in both ways.


► Both durum wheat and chickpea increase P availability in their rhizospheres.
► P availability was enhanced especially when species were intercropped in a low P soil.
► Increases in P availability occurred even with root-induced alkalization in a neutral soil.
► Other rhizosphere processes than root-induced pH changes were involved in increasing P availability.
► Chickpea facilitated durum wheat in a low P soil, and vice versa.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 46, March 2012, Pages 181–190
نویسندگان
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