Effects of Nitrogen, Phosphorus and Potassium on the Seed-stalk Elongation of Mustard.

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  • 肥料三要素が芥菜の抽苔におよぼす影響

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筆者はBrassica juncea Coss.に属する沖縄在来種の芥菜の抽苔におよぼす窒素、燐酸、加里およびこれらの交互作用の影響を研究した。２^３要因排列実験法で(1)，n,p,np,k,nk,pk,npk,の８通りの処理を４反覆した。統計処理の結果、窒素、窒素と燐酸の交互作用、窒素と燐酸と加里の交互作用、加里の順に抽苔を遅らせる効果が大きいことを認めた。燐酸、窒素と加里の交互作用、燐酸と加里の交互作用の効果には有意な差は認められなかった。処理の合計から効果の合計の計算にはYates' methodを用い、有意性の検定にはt-testを用いた。Yates' methodは従来の計算法より至って簡単である、t-testはF-testより計算が簡単である上に明瞭である。この方法は筆者が知る限りでは日本の統計学の著書に見出されない方法であり、ここに紹介した。

The author studied the effects of nitrogen, phosphorus, potassium, and their two and three Order interations on the seed-stalk elongation of the Okinawan native variety of mustard (Brassica juncea Coss.).In accordance with 2^3 factorial design, 8 treatments of(1),n,p,np, k,nk,pk, and npk made, and each treatment was replicated four times. As the result of a statistical method, it was found that N, interactions of NP and NPK, and K gave highly significant effects on delaying the initiation of the seed-stalk elongation of the mustar. The effects of P and interactions of NP and PK were not significant. The author introduced Yates’ method in calculating effect totals and adopted t-test in the Statistical treatment of the factorial design, which are not widely used among the statisticians of Japan.

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