Effects of soil acidity adjustment using converter slag on watermelon growth, yield and magnesium absorption
2018
Kimura, M. | Suzuki, H. | Yamaki, A. | Yokoyama, T. | Kaneko, Y.
The authors investigated the effects of 0 - 10 cm depth soil acidity adjustment to pH 7.5 using converter slag on the growth, yield and magnesium absorption of watermelon. 2.6 years after application of converter slag, the soil pH had remained at 6.8 - 7.7. Application did not influence the growth, yield or quality of fruits of conventionally-cultivated watermelon. On the other hand, the CaO/MgO ratio in the soil increased due to application of converter slag, and the Mg content in watermelon leaves decreased. There was no change in the Fe or Mn content of the leaves. The Mg content of the leaves could be increased by addition of magnesium hydroxide alongside the application of converter slag. These results indicate that if magnesium deficiency does not occur, application of converter slag does not affect watermelon cultivation. It is also necessary to apply magnesium hydroxide if converter slag is applied under normal cultivation conditions.
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