Studies on the improvement in iron nutrition of peanut by intercropping with maize on a calcareous soil |
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Authors: | Yuanmei Zuo Fusuo Zhang Xiaolin Li and Yiping Cao |
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Abstract: | Both rhizobox and field experiments were conducted to investigate nutritional interactions between peanut and maize in intercropping
systems for Fe acquistion. Field observations indicated that Fe deficiency chlorosis symptoms in peanut grown in monoculture
were more severe and widespread compared to those of peanuts intercropped with maize. This indicated a marked improvement
in the iron nutrition of peanut intercropped with maize in the field and was further studied. In experiments with rhizoboxes,
roots of maize and peanut were either allowed to interact with each other or prevented from making contact by inserting a
solid plate between the root systems of the two species. A field experiment for four cropping treatments were examined: peanut
grown separately in monoculture, normal peanut/maize intercropping, peanut/maize intercropping with solid plates between the
root systems of the two crop species and peanut/maize intercropping with 30 μm nylon nets between the root systems. The results
show that the chlorophyll and HCl-extractable Fe concentrations in young leaves of peanut in the intercropping system with
unrestricted interactions of the roots of both plant species were much higher than those of peanut in monoculture. In the
nylon mesh treatment, the beneficial effects of the maize extended to row 3. The improvement of Fe nutrition in the intercropping
system got reduced but not diminished completely in the treatment with nylon net. It is suggested that the improvement in
the Fe nutrition of peanut intercropped with maize was mainly caused by rhizosphere interactions between peanut and maize.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Fe nutrition intercropping maize peanut rhizosphere |
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