Cultivation of taro [Colocasia esculenta] by nitrogen fertilizer application based on nitrogen absorption characteristics
2007
Ino, M.(Chiba-ken. Agriculture Research Center (Japan)) | Suzuki, K. | Saito, K.
The taro was grown by the cultivation which reduced the nitrogen fertilizer in Andosol, the effective method of fertilizer application and nitrogen absorption characteristics were investigated. 1. In the early harvesting, as for the cultivation which reduced the nitrogen fertilizer to 60% (stripe application) of the standard (N12kg/10a), the yield equivalent to the standard was obtained. The recovery rate of fertilizer nitrogen in this case showed 77%, and exceeded 45% of the standard. 2. In the late harvesting, as for the cultivation which reduced the nitrogen fertilizer to 70% (stripe application) of the standard (N18kg/10a), the yield equivalent to the standard was obtained. The recovery rate of fertilizer nitrogen in this case showed 48%, and exceeded 34% of the standard. 3. In both cropping types, the amount of nitrogen absorption on the cultivation which reduced the nitrogen fertilizer was almost the same as the standard. As the result, the nitrate nitrogen content in the soil after harvest decreased from the standard. 4. In the relation between the amount of nitrogen absorption and the yield, high correlation was accepted in the early harvesting (R**2=0.836), but in the late harvesting the correlation fell a little (R**2=0.579).
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