Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 3 May 2006
Published in Agron J 98:749-759 (2006)
DOI: 10.2134/agronj2005.0165
© 2006 American Society of Agronomy
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Crushed Cotton Gin Compost Effects on Soil Biological Properties, Nutrient Leaching Losses, and Maize Yield

M. Tejadaa,* and J. L. Gonzalezb

a Dep. de Cristalografía, Mineralogía y Química Agrícola, EUITA, Univ. de Sevilla, Crta de Utrera, km. 1, E-41013, Sevilla, Spain
b Dep. de Química Agrícola y Edafología, Univ. de Córdoba, Campus de Rabanales, Edificio C-3, Crta N-IV-a, km 396, E-14014 Córdoba, Spain


Figure 1
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  		Fig. 1. Design of the lysimeters used in this study.

 

Figure 2
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  		Fig. 2. Leaching losses of NH4+–N and NO3––N from soils. Error bars represent standard deviation. CC1: 20 t ha–1 of compost; CC2: 40 t ha–1 of compost; CCM1: 20 t ha–1 of compost plus 400 kg N ha–1 (as NH4NO3); CCM2: 40 t ha–1 of compost plus 400 kg N ha–1.

 

Figure 3
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  		Fig. 3. Leaching losses of total inorganic N for each year from soils (a) as total losses and regression analysis (b) for year and (c) treatment. Error bars represent the standard deviation. CC1: 20 t ha–1 of compost; CC2: 40 t ha–1 of compost; CCM1: 20 t ha–1 of compost plus 400 kg N ha–1 (as NH4NO3); CCM2: 40 t ha–1 of compost plus 400 kg N ha–1. Treatment 1: control soil; 2: CC1; 3: CC2; 4: CCM1; and 5: CCM2.

 

Figure 4
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  		Fig. 4. Leaching losses of P and K from soils. Error bars represent the standard deviation. CC1: 20 t ha–1 of compost; CC2: 40 t ha–1 of compost; CCM1: 20 t ha–1 of compost plus 400 kg N ha–1 (as NH4NO3); CCM2: 40 t ha–1 of compost plus 400 kg N ha–1.

 

Figure 5
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  		Fig. 5. The N/P ratios of leachates, as total inorganic N and its fractions, for the different treatments used in this study. Both net and cumulative values are shown. Error bars represent the standard deviation. CC1: 20 t ha–1 of compost; CC2: 40 t ha–1 of compost; CCM1: 20 t ha–1 of compost plus 400 kg N ha–1 (as NH4NO3); CCM2: 40 t ha–1 of compost plus 400 kg N ha–1.

 




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