ISSN:
1432-2137
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mathematics
Notes:
Gossypium hirsutum L.). Rows were planted within a few centimeters of the rows from the previous year; a common practice in no-till agriculture. The selected soils were Memphis silt loam (fine-silty, mixed, active, thermic Typic Hapludalf), Lexington silt loam (fine-silty, mixed, Ultic Hapludalf), and Loring silt loam (fine-silty, mixed, active, thermic Oxyaquic Fragiudalf). Potassium rates of 0, 28, 56, and 112 kg ha-1 were broadcast annually beginning in 1991. Experimental design was a split plot with five replications. Samples were collected from individual plots in the planted row (IR) and between the row (BR) to a depth of 30 cm. The soil samples were divided into 0- to 8-cm, 8- to 15-cm, and 15- to 30-cm depths and Mehlich-1 P and K were evaluated. Mehlich-1 P varied with soils, sampling position, and soil depth. Differences in extractable P levels due to sampling position would not affect soil test ratings; however, additional years in no-till production may magnify position influences and so affect P fertilizer recommendation. Mehlich-1 K was greater for the IR sampling position of the 0- to 8-cm sampling depth for the three soils. Sampling only the BR position may in some instances give a lower soil test value, resulting in higher fertilizer applications. These differences varied with soil-applied K rates and may increase with additional time in no-till cotton.
Type of Medium:
Electronic Resource
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