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soil

NT > CT

foliage

CT > NT

Ecosystem N turnover time

NT > CT

Ecosystem N efficiency

NT > CT (?)

From House et al., 1984.

From House et al., 1984.

prior to the highest rate of NO3-N accumulation in the no-till than in the stubble-mulch treatments. However, it is possible that there was more mineralization in the stubble-mulch plots earlier in the year before the first sample date, and this mineralized nitrogen was moved below the sampling depth (20 cm) as NO3-N during a rainfall event. Interactions between modification of system structure and major nutrient processes need more study. Certainly soil fauna are sensitive to increased nutrient inputs from fertilizers and manures, and this needs to be considered in experimental work (Marshall, 1977; Hendrix et al., 1992).

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