Growth of Young Sorghum Plant on Two Okinawan Acid Soils Treated with Slag and Nitrogen
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概要
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An pot experiment was conducted in order to investigate effects of slag (a soil amendment) and nitrogen applied to two Okinawan acid soils on the growth and the absorption of nitrogen and phosphate of the sorghum plant (Sorghum Sudanese x Sorghum succharatum; Culti. Diasorghum). The experiment was three factorial ; namely the soils used were a Red soil (pH4.8) and a Dark Red soil (pH5.7). The slag was applied at a rate of 0 and 30g par 3kg (per pot) of soil, and ammonium sulfate as a source of nitrogen was applied at a rate of 2.5 and 5.0g per 3kg of soil. The weight of the aerial portions of the plant was determined as a measure of the plant growth. Significant difference in the fresh and dry weights of the plant was found between the two soils; namely the plant growth was much better on the Dark Red soil which had chemical properties superior to the Red soil in every aspect except for nitrogen content. There was also a significant interaction of the soil and slag factors indicating that the slag application was effective on the plant growth in the Red soil but not in the Dark Red soil. The increment of nitrogen applied tended to increase in the dry weight of the plant grown on the Dark Red soil though statistical significance was not found on the nitrogen factor. The level of nitrogen in the plant was significantly higher on the Red soil than on the Dark Red soil. It was deemed that this was due to the higher nitrogen content of the Red soil. The level of phosphate in the plant was found not affected by any of the soil and treatment factors. The quantity of nitrogen absorbed by the plant related closely to the extent of the plant growth and tended to be more in the Dark Red soil than in the Red soil. On the Red soil the nitrogen absorption of the plant increased with the slag application which improved the plant growth. Because of the better plant growth on the Dark Red soil, the quantity of phosphate absorbed by the plant also tended to be more on the Dark Red soil than on the Red soil.沖縄島の2種類の酸性土壌における土壌改良剤スラッグと窒素の施用がソルゴーの生育と窒素及びリン酸の吸収に及ぼす影響を調べる目的でポット試験を行った。土壌は赤色土（pH4.8），暗赤色土（pH5･7），スラッグはポット（5,000分の1aワグネル，土3kg）当たり0又は30g施用，窒素は硫安を2.5g又は5.0g施用の3因子実験で，繰り返しを2回とした。植物は飼料用ダイヤソルゴーを用い，1985年12月20日に播種し，35日間ガラス室で栽培した。土壌分析によると養分含量は赤色土より暗赤色土において高いことが示されたが，ソルゴー地上部の刈り取り生重と乾物重を測定した結果，生重，乾物重ともに暗赤色土で大きく，土壌肥沃度の違いがソルゴーの生育にも反映された。この土壌間の差は1％有意であった。赤色土においてはスラッグ施用によりソルゴー生重は増加したが，暗赤色土においてはその効果がなかった。この土壌とスラッグ間の交互作用は5％有意であった。乾物重については統計的な有意性は示されなかったが，暗赤色土におけるスラッグ無施用の場合，窒素の増施によりソルゴー乾物重は増加する傾向を示した｡ソルゴーの窒素％は赤色土において高かった（5％有意）が，これはこの土壌の窒素含量が暗赤色土より高いことに起因すると思われた。ソルゴーのリン酸％については土壌間及び処理間に大きな差は認められなかった。ソルゴーの窒素及びリン酸吸収量を乾物重×養分％により求めたが，それぞれの吸収量は生育量に大きく影響され，窒素及びリン酸共に暗赤色土において多く吸収された。赤色土においてはスラッグ施用による生育量増加に起因して，窒素，リン酸ともスラッグ施用区で多く吸収される傾向が見られた。以上よりスラッグは土壌改良剤として供試赤色土におけるソルゴーの栽培に極めて有効であると考えられる。
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