Pedosphere 7(2): 165--170, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Genotypic difference of plants in K-enrichment capability and the distribution of K in plant rhizosphere
YAN Wei-Dong, SHI Wei-Ming, LIAO Hai-Qiu and CAO Zhi-Hong
Institute of Soil Science, Academia Sinica, Naniing 210008 (China)
ABSTRACT
      Plant genotypic difference of potassium-enrichment capability and potassium (K) distribution at root-soil interface of different plant genotypes were studied by using seven plant species and eight varieties of tobacco (Nicotiana tabacum L.). The results indicated that K enrichment capability was: Ethiopian guizotia (Guizotia abyssinica Cass.)>feather cockscomb (Celosia argentea L.)>alligator alternanthera (Alternanthera philoxeroides (Mart.) Griseb.)> tobacco>sesbania (Sesbania cannabina (Retz.) Pers.)>wheat (Triticum aestivum L.)>broadbean (Vicia faba L.). Ethiopian guizotia showed very high K-enrichment capability at different soil K levels, and the K content in its dry matter was over 110 mg kg-1 when soil K was fully supplied, and about 60 mg kg-1 when no K fertilizer was applied. For alligator alternanthera, the capability to accumulate K was closely related with its growth medium. When it was grown on soils, both the K content and K uptake rate of the plant were similar to those of tobacco. Evident K depletion was observed in the rhizosphere of all plant species, and the depletion rate was related to the capability of K enrichment of plant.
Key Words:  K-enriched plants, K enrichment, rhizosphere, tobacco (Nicotiana tabacum L.)
Citation: Yan, W. D., Shi, W. M., Liao, H. Q. and Cao, Z. H. 1997. Genotypic difference of plants in K-enrichment capability and the distribution of K in plant rhizosphere. Pedosphere. 7(2): 165-170.
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