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Effects of Tillage and Phosphorus Placement on Phosphorus Runoff Losses in a Grain Sorghum–Soybean Rotation

R.J. Kimmella, G.M. Pierzynski*,a, K.A. Janssena and P.L. Barnesb

a Dep. of Agronomy, 2004 Throckmorton Plant Science Center, Kansas State Univ., Manhattan, KS 66506
b Dep. of Biological and Agricultural Engineering, Kansas State Univ., Manhattan, KS 66506



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  		Fig. 1. Seasonal soluble P loss in 1998 grain sorghum. Tillage designations are ChT for chisel-till, NT for no-till, and RT for ridge-till. Means with the same lowercase letter within a tillage method are not significantly different at P < 0.1. Means with the same uppercase letter within a P application method are not significantly different at P < 0.1.

 


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  		Fig. 2. Seasonal soluble P loss in 1999 grain sorghum. Tillage designations are ChT for chisel-till, NT for no-till, and RT for ridge-till. Means with the same lowercase letter within a tillage method are not significantly different at P < 0.1. Means with the same uppercase letter within a P application method are not significantly different at P < 0.1.

 


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  		Fig. 3. Seasonal soluble P loss in 1999 soybean. Tillage designations are ChT for chisel-till, NT for no-till, and RT for ridge-till. Means with the same lowercase letter within a tillage method are not significantly different at P < 0.1. Means with the same uppercase letter within a P application method are not significantly different at P < 0.1.

 


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  		Fig. 4. Seasonal bioavailable P loss in 1999 soybean. Tillage designations are ChT for chisel-till, NT for no-till, and RT for ridge-till. Means with the same lowercase letter within a tillage method are not significantly different at P < 0.1. Means with the same uppercase letter within a P application method are not significantly different at P < 0.1.

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
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Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2001 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.