Relationships between the Soil Exchangeable K and the Growth Responses of Vegetable Seedlings to K Fertilizer under Different Growing Seasons

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  • 異なる栽培時期におけるそ菜幼植物の生育に対するカリ施肥の効果と置換性カリ含量との関係
  • コトナル サイバイ ジキ ニ オケル ソサイ ヨウショクブツ ノ セイイク ニ

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Abstract

In order to clarify the difference in the relationships between the soil exchangeable K and the growth responses of seedlings to K fertilizer under different growing seasons, 6 kinds of vegetables were grown with 2 levels of K application (0g and 1g K2SO4 per pot) on the 4 soils containing different exchangeable K, in summer and in winter, respectively. All pots received 1g ammonium sulfate and 5g superphosphate. In the experiments of spinach and lettuce 3g slaked lime was applied to all pots. Germinated seeds were sown in 1/5, 000-are Wagner pots filled with 1.6kg soil (oven dry basis). Seedlings were harvested at the time when the first true leaf began to emerge.<br>1. In both seasons, increases in the fresh weight of spinach and turnip seedlings due to K application were obtained on the soils containing 75ppm and 161ppm exchangeable K, but not obtained on the soils containing 254ppm and 343ppm exchangeable K.<br>2. In both seasons, increases in the fresh weight of lettuce and radish seedlings due to K application were obtained only on the soil containing 75ppm exchangeable K, but not obtained on the soils containing 254ppm and 343ppm exchangeable K. On the soil containing 161ppm exchangeable K, K application increased the fresh weight of seedlings only in winter.<br>3. Increases in the fresh weight of cucumber and carrot seedlings due to K application were not obtained on the soils containing 161ppm, 254ppm and 343ppm exchangeable K in both seasons. Although cucumber seedlings increased their fresh weight with K application on the soil containing 75ppm exchangeable K in both seasons, carrot seedlings increased only in winter.

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