The fertility of sloping salt field was defined to the ability of brine production in some value of Shijoka area ratio. Geographical and climatic conditions, construction of salt field and Shijoka; and human faculties were the factors of field fertility, and they influenecd to each other. Therefor, it was dificult to distinguish each influence. In this paper, the field fertility was described with the actual results in salt field and culculations in some assumptions.

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Unsaturated polyester resin are cured easily under room temperature and contact pressure, investigating for the purpose utilize to the protective coating of surfaces of metals, wood and cementmortar in the salt manufacturing, were found full well reinforcing effect by using carbon powder as the filler for relary of the glass fiber reinforcing method. From the results of various tests were certificated to be reformed remarkably the resistance of sea water brine, thermoresistance, anti-exposed and adherent property, etc.. by addition of carbon powder.

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25°および110℃における海水の濃縮過程において, 各段階の溶液組成, 蒸発水量, 析出団体量を行列式を用いて計算した. 行列式法の特徴は (1) 3次元以上の解も容易に求められる事.(作図的には3次元以下に制限される.)(2) 任意の桁まで求められる.(3) 然し計算に長時間を要する欠点がある. 直角三角形座標を用いたが, これは対称性は失われるが, 計算が容易であり, 正三角形座標系では120°の角度の特殊方眼紙を必要とするのに対してこれでは普通の方眼紙が使用できる. 又NaCl-MgCl-MgSO₄-KCl系でなく, Na-Mg-Cl-SO₄のイオン系によつて不必要な計算を省いた. 3点以上の点の作る面の場合, 溶解度が最小になるように3箇の点を選んだ.

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Common calcium superphosphate is inferior to fused phosphatic fertilizer, which is manufactured from rock phosphate and serpentine and contains P₂O₅ about 20-22%, SiO₂ about 22-25 %, CaO about 25-30 %, and MgO about 16-20%, owing to no content of magnesia.
In the present study, magnesian calcium superphosphate fertilizer was prepared by mixing superphosphate with various magnesia containing materials, i.e., serpentine, dolomite or sea-water magnesia, and these special magnesian calcium superphosphate samples ware compared on main compositions, especially the changes of solubilities of P₂O₅ and MgO in 2% citric acid or 0.5 NHCl solution by storing 1, 4, 8 or 12 weeks.

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