Seasonal Changes in Productivity and Quality of Temperate Grasses and the Fluctuations with Years : 3. Changes of mineral content

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  • 寒地型イネ科草種の生産性と品質の季節的変化とその年次変動 : 3.無機成分含有率の変化
  • カンチガタ イネカ ソウシュ ノ セイサンセイ ト ヒンシツ ノ キセツテキ

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Abstract

Seasonal changes of mineral contents of 6 temperate grasses were compared and the relationship between mineral contents and meteorological elements was investigated. Lolium perenne, Dactylis glomerata, Festuca arundinacea, Agrostis alba, Festuca rubra and Poa pratensis were sown in 1984, and the mineral contents were determined from 1985 to 1989 under frequent cutting based on the pattern derived by an overlapping sequence of 3-weekly cuts. The grasses were received 200kg N+100kg P_2O_5+175kg K_2O/ha/year with even amount of top-dressing after each cut and no irrigation. Seasonal changes of average air temperature and precipitation showed that less precipitation was around the middle of June and less precipitation combined with high air temperature was around the middle of August, especially for August of 1985 and 1989. The N content of grasses declined around May, and recovered gradually by autumn. P and K contents and K/(Ca+Mg) ratio declined in mid June and in mid August, especially for August of 1985 and 1989, and recovered gradually thereafter. P and Ca contents were high, especially during the summer, in Lolium perenne. K content was low in Poa pratensis and Mg content was high in Festuca arundinacea. In Dactylis glomerata, K/(Ca+Mg) ratio was high, especially during the spring in the first harvest year, and Ca content was low during the spring.

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