Crop rotations and nitrogen - crop sequence comparison on soils of the driftless area of southwestern Wisconsin 1967-1974

Higgs, R.L.; Paulson, W.H.; Pendelton, J.W.; Peterson, A.F.; Jackobs, J.A.; Shrader, W.D.

Research Bulletin, College of Agricultural and Life Sciences, University of Wisconsin (R2761): 12

1976


Accession: 000329526

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Abstract
In field trials on Rozetta silt loam soil at Lancaster, Wisconsin in 1967-74, crop sequences compared were continuous maize, maize/soyabeans/maize/oats/lucerne, maize/maize/maize/oats/lucerne, maize/maize/oats/lucerne/lucerne and maize/oats/lucerne/lucerne/lucerne. N was applied to the maize in each rotation at rates of 75, 150 or 300 lb/ac yr. Av. grain yield for 1st-yr maize was 136 bu/ac, compared with 128 bu/ac for maize following maize. N fertilizer required for these yields varied from 0 to 75 lb/ac for 1st-yr maize and from 75 to 150 lb/ac for maize following maize. Even with continuous maize and with 3rd-yr maize in the maize/maize/maize/oats/lucerne rotation, maize yields were as high or higher with 75-150 lb N/ac than with 300 lb N/ac. Oat yields were similar in all rotations, averaging 54 bu/ac when no N was applied to the preceding maize crop and 70 bu/ac when 150 and 300 lb N/ac was applied to the maize. Hay yields of lucerne averaged 3.3 ton/ac regardless of rotation, N treatment of maize or yr after sowing. Av. soyabean seed yield was 36 bu/ac and a significant response to residual N was shown in only 2 of the 8 yr.