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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 74, No. 4, 2014, pp. 477-484
Bioline Code: cj14068
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 74, No. 4, 2014, pp. 477-484

 en Microbial activity of soil cultivated with corn in association with weeds under different fertility management systems
Melo, Christiane; Fialho, Cíntia; Faria, Autieres; Neto, Manoel; Saraiva, Douglas; Costa, Maurício; Ferreira, Lino & Ferreira, Francisco Affonso

Abstract

Interactions between weeds and soil microorganisms can give them a competitive advantage over crops. This study assessed the biomass and microbial activity of soil cultivated with weeds and corn ( Zea mays check for this species in other resources L.) in monoculture and in competition under different fertility management systems. The experiment considered four soil fertility management systems (calcium and magnesium silicate + fertilization; limestone + fertilization; no correction source + fertilization; no correction source + no fertilization) and 12 crops (five competition arrangements between corn and weeds Urochloa brizantha check for this species in other resources (Hochst. ex A. Rich.) R.D. Webster, Ipomoea grandifolia check for this species in other resources (Dammer) O’Donell, Conyza canadensis check for this species in other resources (L.) Cronquist, Hyptis suaveolens check for this species in other resources (L.) Poit., and Bidens pilosa check for this species in other resources L. plus the six species in monoculture and bare soil. After 60 d coexisting in a greenhouse, soil samples were collected to determine microbial biomass, respiration rate, and metabolic quotient. Soils cultivated with B. pilosa and Z. mays+U. brizantha showed higher microbial biomass. Cultivation of B. pilosa and Z. mays+H. suaveolens provided greater energy efficiency to maintain microbial cells. Biomass and microbial activity were altered by plant species, coexistence, and soil fertility management. Calcium and magnesium silicate, as well as limestone similarly influenced biomass and respiration rate of soil cultivated with most species. For some crops, the Si source was better than limestone to promote lower specific activity of the edaphic microbiota. The change in the microbial activity of soil can be a strategy used by the species to minimize the effects of competition.

Keywords
Calcium and magnesium silicate; soil microorganism/weed interaction; interference; limestone; microbial biomass; soil metabolic quotient; Zea mays

 
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