Effect of physico-chemical properties of soils on nitrogen leaching during autumn-winter spinach cultivation

FUJITOMI Shinichi, SUEYOSHI Takayuki

doi:10.20710/dojo.80.1_23

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秋冬作ホウレンソウ栽培における窒素溶脱に対する土壌の理化学性の影響
アキフユサクホウレンソウサイバイニオケルチッソヨウダツニタイスルドジョウノリカガクセイノエイキョウ

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Abstract

We investigated the effect of the physico-chemical properties of soils on inorganic nitrogen (IN) leaching during spinach (Spinacia oleracea L.) cultivation in autumn and winter using columns packed with light-colored Andosol (A), loamy gray lowland soil (L) and clayey gray lowland soil (C). The total amount of water percolated through the column in the growing period was greatest for L, followed by C, then A. This was the reverse order of the water-holding capacity (WHC) of the three soils. L experienced the largest amount of IN leaching, which consisted of 49% nitrate-N and 51% ammonium-N. The high proportion of ammonium-N could be semi-quantitatively explained by the fact that L had the lowest effective cation exchange capacity. IN leaching from A, which had the highest WHC, was initially less than from the other two soils. However, once cumulative irrigation had exceeded the sum of A's WHC and evapotranspiration, IN leaching increased substantially due to A's high hydraulic conductivity. The relatively high rates of IN leaching observed in the present experiment may have resulted from limited uptake of IN by spinach, whose growth was hindered by elevated levels of ammonium-N.

Journal

Japanese Journal of Soil Science and Plant Nutrition

Japanese Journal of Soil Science and Plant Nutrition 80 (1), 23-29, 2009

Japanese Society of Soil Science and Plant Nutrition

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