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This article in AJ

  1. Vol. 71 No. 3, p. 487-489
     
    Received: Apr 20, 1978
    Published: May, 1979


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doi:10.2134/agronj1979.00021962007100030026x

Differential Mobility of Nitrapyrin and Ammonium in a Sandy Soil and Its Effect on Nitrapyrin Efficiency1

  1. B. D. Rudert and
  2. S. J. Locascio2

Abstract

Abstract

Nitrification inhibition by 2-chloro-6-(trichloromethyl) pyridine (nitrapyrin) has not been consistent on sandy soils. This study was conducted to evaluate movement of nitrapyrin and N in a fine sand as influenced by water rate and leaching period. In greenhouse studies, nitrapyrin reduced NO8-N loss from a Kanapaha fine sand (loamy, siliceous, hyperthermic Grossarenic Paleaquult) for only the first 2 weeks of a 5-week leaching period. In segmented soil columns, nitrapyrin was placed in the soil at a depth from 13 to 15.5 cm. After the soil was leached at water rates of 0, 2.5, and 5 cm/week for 2 and 4 weeks, soil samples were incubated with NH4-N. Nitrification bioassay of soil above and below nitrapyrin placement showed that nitrapyrin movement was affected more by volatility than by water rate. Movement of NH4-N from a 13.0 to 15 cm depth was studied in soil columnsthat contained 20 ppm nitrapyrin in the soil. After leaching, NH4-N and NO3-N levels were determined at various soil depths. With increases in the rate of water applied and in the leaching period, higher levels of NH4-N moved to lower depths than nitrapyrin. Movement of NH4-N away from nitrapyrin may account for the reduced nitrapyrin effectiveness often observed for sandy soils.

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