Study on the Orchardgrass-Alfalfa Mixture : I. Effecte of Seeding Time, Seeding Rate and Magnesia-lime Fertilizer

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  • オーチャードグラスとアルファルファの混播に関する研究 : I.播種期・播種量および苦土石灰量について
  • オーチャードグラスとアルファルファの混播に関する研究-1-播種期・播種量および苦土石灰量について
  • オーチャードグラス ト アルファルファ ノ コンパン ニカンスルケンキュウ 1

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A field experiment was conducted in Miyagi, Japan to clarify the effect of seeding time, seeding rate and magnesia-lime fertilizer application on the yield and composition of an orchardgrass-alfalfa mixture. Treatments comprised four stages of seeding time, three levels of seeding rate and three levels of magnesia-lime fertilizer quantity. Results obtained indicate the followings: 1. Competitive capacity of alfalfa in the early stage of growth is inferior to that of orchardgrass, seeding during and after the last ten days in August. Therefore, for successful stand establishment of alfalfa and a high yield composition of alfalfa, it is assumed that the optimum seeding time of orchardgrass-alfalfa mixture is the middle ten days of August in the hilly districts of Tohoku. 2. In orchardgrass-alfalfa mixture, dense sowing of alfalfa was ineffective for stand establishment and for high yield composition of alfalfa. This is due not only to the interspecific competition of orchadgrass and alfalfa but also to the intra-specific competition among alfalfa. 3. The survival population and yield composition of alfalfa in mixed orchardgrass-alfalfa grassland showed a marked increase in the plots applied greater quantities of lime fertilizer.

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