桑の金属元素過剰害に対するりん酸施肥による軽減効果

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概要

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• Phosphorus effects to mulberry growth which suffered from Cu, Co, Ni or Zn injury were tested by soil culture method.Acidic alluvial sandy loam was used. Metal elements were supplied in the following amounts; Cu 1.67, Co 8.33, Ni 12.5 and Zn 80ppm per dried soil. Based on another experiment, half reduction of mulberry growth were forecasted by this.1. Mulberry leaf yield increased markedly by heavy phoshorus application in spite of metal element supply or no supply, and the increment reached in about 70% for the cases of no metal supply, Co or Zn supply.2. Under consideration of the leaf yield increment by phosphorus application in no metal supply plot, the yield increment in the case of each metal supply was reevaluated, because the soil was a priori poor in phoshorus fertility. As the result, the substancial increments of yield by phosphorus application were only several percent in the cases of Co or Zn supply. In the cases of Cu or Ni supply the yield did not increase substancially.3. Cu, Ni and Zn contents in leaves decreased in appearance by heavy phosphorus application. The decrement of Ni and Zn contents may be explained from the stand point of "dilution effect" caused by growth ameriolation, but the reasonable explanation was not obtained to Cu content decrement.4. Relative composition of macro-nutrients to nitrogen content in whole leaves was influenced by metal element supply. The P/N decrement with decreasing and the K/N decrement with increasing of phosphorus application were characteristic in the case of Zn supply.

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