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20,980

"Means of samples from June-October 1983; numbers are x10-3. 'Means of samples from May-December 1983. cMeans of samples from April-June 1983. dMeans of samples from April 1983.

eFor numbers of organisms, tillage treatments differ significantly at P = 0.05. From Hendrix et al., 1986.

"Means of samples from June-October 1983; numbers are x10-3. 'Means of samples from May-December 1983. cMeans of samples from April-June 1983. dMeans of samples from April 1983.

eFor numbers of organisms, tillage treatments differ significantly at P = 0.05. From Hendrix et al., 1986.

TABLE 5.6. Comparison ofAgroecosystem Components and Associated Agroecosystem Processes from Conventional Tillage (CT) and No-Tillage (NT) Systems

Component or process

CT versus NT

Crop yields

NT = CT (except during drought)

Crop biomass

Decreasing in both CT and NT

Weed biomass

NT > CT

Plant nitrogen dynamics

CT > NT (nitrogen flux)

Shoot to root ratios

CT > NT

Nitrogen fixation

NT > CT (?)

Surface crop and weed residues

NT >> CT

Litter decomposition rates

CT > NT

Surface litter (%N)

NT > CT

Soil total N

NT > CT in upper soil layer

Nitrification activity

NT > CT in upper soil layer

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