By J. Benton Jones Jr.
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Extra info for Laboratory Guide for Conducting Soil Tests and Plant Analysis
Example text
Soil tests can be grouped into several categories based on objective: Soil Test Objective Water, salt, and buffer pHs Soil reaction and lime requirement Extractable elements Major elements (P, K, Ca, Mg, NO3, SO4) Micronutrients (B, Cl, Cu, Fe, Mo, Mn, Zn) Other elements (Al, Na) Trace elements and heavy metals (As, Cd, Co, Cr, Cu, Mn, Pb, Ni) } } Nutrient element status Toxicity Organic matter content Physical and chemical characteristics Mechanical analysis Soil texture classification Soluble salts Total salts in the soil solution All these determinations can be performed via a number of laboratory procedures; the method selected is determined, in part, by the physical and chemical characteristics of the soil.
1 Sequence of procedures for conducting a soil test. nutrient elements, (2) to counter acidification, and (3) to maintain the proper nutrient element balance for optimum plant growth. B. Sequence of Procedures The value of a soil analysis result is no better than the quality of the sample assayed, determined by: 1. 2. 3. 4. 5. 6. , 1998; Wright, 1998; Brown, 1999; Radojevic and Baskin, 1999). What conditions existed in transport to the laboratory. The type of preparation techniques used to prepare the laboratory sample (Bates, 1993; Anonymous, 1994a; Hoskins and Ross, 1995; Gelderman and Mallarino, 1998; Brown, 1999; Radojevic and Baskin, 1999).
A different set of pH interpretative values must be used when the pH is measured in 1 N KCl. 56 g potassium chloride (KCl) into a 1000-mL volumetric flask and bring to volume with water. 25 cm3 air-dried <10-mesh-sieved (2-mm) soil into a cup. Pipette 5 mL 1 N KCl into the cup and stir for 5 s. Let stand for 10 min. Calibrate the pH meter according to the instructions supplied with the specific meter. SL5336Ch02Frame Page 35 Tuesday, May 1, 2001 8:06 AM Soil Analysis (Testing) pH CaCl 35 2 7. 6.