Complementarity of two distinct phosphorus acquisition strategies in maize-white lupine intercropping system under limited phosphorus availability

Dissanayaka, D. M. S. B.; Wasaki, Jun

doi:10.1080/15427528.2020.1808868

Cited by 3 publications

(2 citation statements)

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“…In the −P treatment, as expected, a significant increase in P concentrations in the soybean leaves was observed when co-cultured with lupin, suggesting that improved P nutrition was responsible for the improved growth of soybean. Similar results have been observed in previous pot experiments cultivating maize with lupin (Dissanayaka et al 2015;Dissanayaka and Wasaki 2021). Meanwhile, enhanced uptake of alkaline metal elements such as K and Rb and alkaline earth metal elements such as Mg, Ca, Sr, and Ba was also observed in soybean co-cultured with lupin in the −P treatment.…”

Section: Discussionsupporting

confidence: 89%

“…These cluster roots efficiently exude phosphatase and organic acids to decompose organic P and solubilize insoluble P, respectively, in the rhizosphere (Neumann et al 2000;Wasaki et al 2003). These abilities of lupin roots are powerful, and in pot experiment where maize was mixedcropped with lupin, it was reported that the P nutrient status of maize in P-deficient soil was significantly improved due to the mixed cropping with lupin (Dissanayaka et al 2015;Dissanayaka and Wasaki 2021). Furthermore, it has been found that in the lupin rhizosphere, organic nitrogen (N) may be decomposed by lupin roots, rather than rhizosphere microorganisms (Fujiishi, Maejima, and Watanabe 2020).…”

Section: Introductionmentioning

confidence: 99%

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Possible solubilization of various mineral elements in the rhizosphere of Lupinus albus L

Takao

Wasaki

Fujimoto

et al. 2021

Soil Science and Plant Nutrition

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Lupinus albus L. (lupin) has a high tolerance for phosphorus deficient conditions as its roots can solubilize the unavailable phosphorus in the rhizosphere soil. The roots may also be able to solubilize other elements, but this requires further investigation. In this study, therefore, we conducted two experiments to comprehensively investigate the effects of lupin roots on the mineral dynamics of the rhizosphere soil. First, a mixed cropping experiment was conducted, in which lupin shared a rhizosphere with soybean (Glycine max (L.) Merr.) in a long-term experimental field with four fertilizer treatments: complete fertilization (+NPK), without nitrogen (−N), without phosphorus (−P), and without potassium (−K). The results of shoot dry weight of plants cultivated alone indicated that lupin is highly tolerant to all N, P, and K deficiencies, while soybean can adapt to N deficiency with the help of rhizobia but is less tolerant to P and K deficiencies than lupin. When mixed-cropped with lupin, the concentrations of many elements in the soybean leaf increased, particularly with the −N and −P treatments. Furthermore, soybean growth was significantly improved when cropped with lupin in the −N and −P treatments. Second, a comparison of the elemental profiles of hydroponically and field-soil-grown plants was conducted. Under hydroponic conditions, the rhizosphere effect is negligible when the culture medium is well circulated. The lupin/soybean ratios for leaf mineral concentrations were considerably larger in the field cultivated plants when compared with the hydroponic cultivations for elements such as sodium, potassium, cesium, phosphorus, iron, copper, and molybdenum, as there were lower concentrations of these elements in the soybean leaves in the field. These results indicate that lupin roots can solubilize a variety of insoluble elements in the soil, which may be the reason why lupin can adapt to various nutrient deficient soils. In the lupin rhizosphere, the solubilization of cesium, which is generally strongly fixed by soil minerals and not easily leached, was particularly pronounced. This implies that the surface structure of clay minerals might be altered in the lupin rhizosphere, resulting in the fixed forms of various elements becoming available.

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Section: Discussionsupporting

confidence: 89%