Reference

Seasonal changes in soil biological activity of two different forest associations

Seasonal changes in soil biological activity of two different forest associations. Kunze, Christian (Inst. Pflanzenoekol., Justus-Liebig-Univ., Giessen, Ger.). Zentralbl. Bakteriol., Parasitenkd., Infektionskr. Hyg., Abt. 2, 132(7), 655-8 (German) 1977. CODEN: ZBPIA9. ISSN: 0044-4057. DOCUMENT TYPE: Journal CA Section: 19 (Fertilizers, Soils, and Plant Nutrition) Av. annual activities of sucrase [9001-57-4], phosphatase [9013-05-2], and catalase [9001-05-2] were higher in soil of beech than in that of spruce assocn., whereas the CO2 formation and vanillic acid [121-34-6] decompn. prevailed slightly in the soil of the latter forest assocn. The seasonal changes in soil biol. activity were habitat-and weather-dependent; they depended largely on soil temp. and moisture. The total soil biol. activity was highest in July and lowest in Jan.; it increased from Jan. to Apr., showed a slight depression in May, further increased till July, decreased till Sept., had a 3rd peak in Nov., and then decreased till Jan. In Mar. and Dec. the soil biol. activity had approx. values equal the av. annual ones.

Observations on soil fungistasis

Observations on soil fungistasis. V. Fungistasis in relation to the rhizosphere effect. Kanaujia, R. S. (Dep. Bot., Univ. Gorakhpur, Gorakhpur, India). Acta Mycol., 13(1), 151-67 (English) 1977. CODEN: ACMYAC. DOCUMENT TYPE: Journal CA Section: 19 (Fertilizers, Soils, and Plant Nutrition) The fungistatic action of soil samples corresponding to crown, middle, and distal regions of rhizosphere and nonrhizosphere root regions under Pennisetum typhoides was tested against 10 fungi in India. The crown region had the highest activity followed by the middle and distal regions and the activity was generally less in the rhozosphere soil. Fungistasis against Rhizopus nigricans, Fuscarium nivale, and Aspergillus flavus varied with respect to sampling date and root region. Amino acids and sugars in root exudates were least in Aug. and increased to Oct. Cellulose [9004-34-6], hemicellulose [9034-32-6], and lignin [9005-53-2] contents increased with the aging of the roots from Aug. to Nov. and then decreased. Root exudates generally enhanced the germination of rhizosphere fungi. Root washings in Mar. and Apr. contained phytotoxic vanillic acid [121-34-6] and 3,4-dihydroxybenzoic acid [99-50-3].