Establishment of single basal fertilizer application technology with controlled-release fertilizer to satsuma mandarin young trees
2015
Kurita, Y. | Koube, H. | Kuroda, T.
We developed the controlled-release fertilizer in order to obtain stable fertilization effect and to eliminate labor for young Satsuma mandarin trees. The fertilizer treatments were designed for continuous elution of nitrogen during growth of above ground biomass, and to complete total fertilization in early March once a year. During growing tests, we established an experimental plot that had 20% nitrogen reduction than practices and an experimental plot that had as much nitrogen as practices. These were compared with habitual fertilizer. In the elution experiment, controlled-release fertilizer continued eluting nitrogen from March to November. In the cultivation experiment, when we used the same amount of nitrogen as practices at a cultivation experiment, pH of soil was high, EC was low, nitrate nitrogen in soil was slightly low, and the phosphorus and the potassium were equal. Nitrogen, phosphorus, and potassium in leaves were equal. There was no difference in growth. On the other hand, when we made 20% reduction in nitrogen than practices, pH of soil was high, EC was low, and nitrate nitrogen in soil was slightly lower. Phosphorus and potassium were also equal. Nitrogen in leaves was low, and the phosphorus and the potassium were equal. There was no difference in total leaf number, branch length, of canopy volume, Root weight was found to decrease.
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