Phosphorus leaching from loamy sand and clay loam topsoils after application of pig slurry

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Table 6 Increase in leachate amounts, concentrations and leaching loads of different forms of P after slurry or mineral P application to the soil columns

Soil	Treatment	Leachate mm	Total P		DRP		Other-P
			Conc., mg L^-1	Load, kg ha^-1	Conc., mg L^-1	Load, kg ha^-1	Conc., mg L^-1	Load, kg ha^-1
Clay loam	Control	0.2	0.00	−0.001	−0.01	−0.002	0.01	0.002
	SP-Surf	0.4	2.65***	0.461***	1.74***	0.298***	0.91***	0.163***
	SP-Incor	1.6	1.23***	0.214***	0.56***	0.096***	0.68***	0.118***
	MinP	2.1	1.42***	0.219***	1.13***	0.171***	0.29***	0.048***
Loamy sand	Control	1.2	−0.04	−0.004	−0.02	−0.001	−0.02	−0.003
	SP-Surf	0.7	−0.03	−0.004	−0.03	−0.004	0.00	0.001*
	SP-Incor	−3.5*	0.03	−0.002	−0.01	−0.006	0.04	0.004*
	MinP	−2.3	−0.02	−0.009	0.00	−0.004	−0.02	−0.005

Symbol (*) indicate significant differences between values after P application and before (*: α=0.05; ***: α=0.001; n=3 for the control of the clay loam throughout the experiment, and for the SP-Incor and MinP treatments of the clay loam after the laboratory P application, respectively; n=4 for all the other treatments).