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Effect of plant types on release of mineral potassium from gneiss (2000)

Wang, J.G. ; Zhang, F.S. ; Cao, Y.P. ; [et al.]

Springer

Nutrient cycling in agroecosystems 56 (2000), S. 37-43

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ISSN: 1573-0867

Keywords: alfalfa ; gneiss ; Italian ryegrass ; maize ; mineral K ; pak-choi

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract The ability of plant types to release mineral K from little weathered gneiss for a mixture of particle size fractions of less than 10 mm, as well as for two separated size fractions (2 mm〈D〈5 mm, and 1 mm 〈D〈2 mm) were compared in pot experiments with maize (Zea mays L. cv. ND60), pak-choi (Brassica campestrisL. ssp.chinensis (L.) Mokina. var. cammunis Tsen et Lee, cv. Wuyueman) and two alfalfa cultivars (Medicago sativa L. cv. Asta and Haifei). Release of mineral K was significantly stimulated by maize, pak-choi and ryegrass, implying a direct mobilization of mineral K by plant roots. The net release of mineral K was greatly influenced by plant species. Among these, the more profound release of mineral K was observed with maize and ryegrass. Besides, the mobilization of mineral K was negatively correlated with the particle size of gneiss. The difference in net release of K from gneiss between two size fractions decreased in the order: maize 〉 ryegrass 〉 pak-choi.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009826111929

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Release of potassium from K-bearing minerals: Effect of plant roots under P deficiency (2000)

Wang, J.G. ; Zhang, F.S. ; Zhang, X.L. ; [et al.]

Springer

Nutrient cycling in agroecosystems 56 (2000), S. 45-52

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ISSN: 1573-0867

Keywords: feldspar ; gneiss ; mineral K ; organic acids ; P deficiency ; rhizosphere

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Pot experiments were conducted, with ryegrass (Lolium perenneL.) maize (Zea mays L ND60) and pak-choi (Brassica campestrisL. ssp.chinensis (L.) Mokina. var. cammunis Tsen et Lee, cv. Wuyueman), to investigate plant mobilization of mineral K in gneiss and feldspar under P-deficient conditions. For both pak-choi and maize grown in gneiss, P-starvation led to a significant increase in K concentration in their shoots, and the net release of K from the mineral K pool was significantly enhanced when the crops grew in feldspar. The enhanced mobilization of mineral K might be attributed to the release of organic acids from the plant roots. When gneiss of various particle sizes was exposed to malic and tartaric acids, both acids had a direct positive influence on the release of mineral K from gneiss. More release of K was observed with increasing concentration of both organic acids, much more so for finer particle size fractions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009894427550

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