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Lime-Induced Changes in Indices of Soil Phosphate Availability

^a New Zealand Institute for Crop and Food Research Limited, Private Bag 4704, Christchurch, New Zealand
^b Department of Natural Resources and Environmental Sciences, Naresuan University, Phitsanulok 65000, Thailand

View larger version (32K): [in a new window]   Fig. 1. Changes in Olsen P in response to increasing pH by liming for six soils treated with three rates of P. Circle, zero P; triangle, low P rate; square, high P rate. The low and high P rates for each soil are given in the Materials and Methods section. Vertical bars represent LSDs at

View larger version (31K): [in a new window]   Fig. 2. Changes in water-extractable P in response to increasing pH by liming for six soils treated with three rates of P. Circle, zero P; triangle, low P rate; square, high P rate. The low and high P rates for each soil are given in the Materials and Methods section. Vertical bars represent LSDs at

View larger version (27K): [in a new window]   Fig. 3. Relationship between Olsen P and water-extractable P for soils incubated with lime and P. Values beside the regression lines are coefficients of determination (R2), all of which were significant at P < 0.001. Data points marked with arrows are preincubation values for soils not amended with lime or P

View larger version (20K): [in a new window]   Fig. 4. Effect of lime (pH) and P on amounts of P extracted with mixed anion–cation resin from three soils at three levels of applied P. Circle, zero P; triangle, low P rate; square, high P rate. The low and high P rates for each soil are given in the Materials and Methods section. Significance (probability level) of lime (L), added P (P), and L x P effects are shown for each soil

View larger version (38K): [in a new window]   Fig. 5. Concentrations of Ca, Mg, Si, and Mn in saturated paste extracts of Egmont soil, as influenced by lime and P application. Circle, zero P; triangle, 250 mg P kg-1; square, 500 mg P kg-1. Significance (probability level) of lime (L), added P (P), and L x P effects are shown for each element