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Extractable Soil Phosphorus and Inorganic Nitrogen following Application of Raw and Anaerobically Digested Swine Manure

^a Ministry of Agric. (INTA), Dep. of Soil and Land Evaluation, Centro Colon, San Jose, Costa Rica (formerly Dep. of Agron., Iowa State Univ., Ames, IA)
^b Dep. of Agron., Iowa State Univ., Ames, IA 50011-1010

View larger version (35K): [in a new window]   Fig. 1. Extractable NH4–N and NO3–N for each nutrient source and application rate. At each sampling date, the NH4–N or NO3–N concentration in the control soil was subtracted from each sample. Means were determined to be significantly different (P 0.05) using Tukey–Kramer least square means test between N sources at each sampling date and are indicated by: z, fertilizer and digested manure; x, fertilizer and raw manure; and y, digested and raw manure.

View larger version (22K): [in a new window]   Fig. 2. Effect of nutrient source and application rate on soil pH. Means were determined to be significantly different (P 0.05) using Tukey–Kramer least square means test between nutrient sources at each sampling date and are indicated by: z, fertilizer and digested manure; x, fertilizer and raw manure; and y, digested and raw manure.

View larger version (36K): [in a new window]   Fig. 3. Change in extractable P for each nutrient source and application rate. At each sampling date, the soil test P (STP) concentration in the control soil was subtracted from each sample to calculate the change in extractable P. A1, A2, A3, A4; B1, B2, B3, B4; and C1, C2, C3, C4 represent Olsen P, Bray-1 P, and Mehlich-3 P at 12.5, 25, 37.5, and 50 mg added total P kg–1, respectively. Means were determined to be significantly different (P 0.05) using Tukey–Kramer least square means test between P sources at each sampling date and are indicated by: z, fertilizer and digested manure; x, fertilizer and raw manure; and y, digested and raw manure.