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Media type:
E-Article
Title:
Nutrient Budgets and Internal Cycling of N, P, K, Ca, and Mg in Conventional Tillage, No‐Tillage, and Old‐Field Ecosystems on the Georgia Piedmont
Contributor:
Stinner, Benjamin R.;
Crossley, D. A.;
Odum, E. P.;
Todd, R. L.
Published:
Wiley, 1984
Published in:
Ecology, 65 (1984) 2, Seite 354-369
Language:
English
DOI:
10.2307/1941399
ISSN:
0012-9658;
1939-9170
Origination:
Footnote:
Description:
Nutrient budgets (N, P, K, Ca, and Mg) were developed for conventional—tillage, no—tillage, and old—field systems. Data for the budgets were collected over a 2—yr period, with grain sorghum as a main season crop followed by a cover crop of winter rye. Nutrient uptake by crops, weeds, and old—field plants was the largest flow in each system. Leaching losses were small compared to input from fertilizer (except for Ca). Leaching losses of N and Ca was greatest in conventional—tillage, followed by no—tillage systems, and least in the old field. No significant differences were observed between conventional— and no—tillage systems for leaching losses of P, K, and Mg, although leaching of P and K was significantly less in the old field than in either crop system. No—tillage and old—field systems maintained a larger litter component on the soil surface compared to conventional—tillage systems. Decomposition of litter and subsequent mineralization of nutrients appeared to be more rapid in conventional—tillage systems than in either no—tillage or old—field systems. Insect consumers mobilized a small portion of total nutrient flux within each system. In all three systems, nutrients were retained in litter and plant biomass, not lost through leaching.