Influences of application of organic materials and soil types on nitrogen balance and nitrate nitrogen concentration of soil solution in carrot cultivation
2004
Miura, K. (National Agricultural Research Center, Tsukuba, Ibaraki (Japan)) | Nishio, T.
The amount of nitrogen, phosphorus and potassium supplied to carrot was designed to be equal among the plots of chemical fertilizer, cattle feces compost and dried hog feces, considering substitution rate and relative fertilizer efficiency, with the four soil types of Cumulic Andosols, Low-humic Andosols, Yellow soils and Gray Lowland soils. Influences of application of organic materials and soil types on nitrogen balance and nitrate nitrogen concentration of soil solution at the depth of 60 cm just below the rooting zone were investigated. The results obtained are summarized below: 1) The yield and the amount of nitrogen uptake were influenced by the fertilizer treatment and different soil types: they were relatively high for the plots of cattle feces compost and dried hog feces for Yellow soils and Gray Lowland soils. The mean nitrate nitrogen concentration during the cultivation period was related closely with the dry matter yield and the amount of nitrogen uptake. 2) The nitrogen balance, i.e., the difference between input and output was relatively low for the plots of chemical fertilizer for Yellow soils and Gray Lowland soils, indicating that the potential environmental pollution was low. On the other hand, the nitrogen balance considering the amount of inorganic nitrogen supplied during the cultivation period was relatively low for the plots of dried hog feces for Yellow soils and Gray Lowland soils. 3 ) The mean nitrate nitrogen concentration of soil solution during the cultivation period was relatively high for the plots of cattle feces compost for Yellow soils and Gray Lowland soils. Among the soil types, it was relatively low for Cumulic Andosols and Low-humic Andosols, probably due to high moisture retention and adsorption of nitrate.
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