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
