Effect of Nitrogen Fertilizer Level on the Productivity and Nutritive Value of Green Panic (Panicum maximum var. trichoglume cv. Petrie)

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  • 暖地型イネ科草グリーンパニックの生長と栄養価値に及ぼす窒素施肥量の影響
  • 暖地型イネ科草グリーンパニックの生長と栄養価値に及ぼす窒素施肥量の影響〔英文〕
  • ダンチガタ イネカ ソウグリーン パニック ノ セイチョウ ト エイヨウ カチ

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Abstract

A field experiment was conducted to study the effects of nitrogen level and regrowth period on the growth and nutritive value of green panic (Panicum maximum var trichoglume cv. Petrie). A 6×3 factorial design in triplicate of six nitrogen levels and three periods of regrowth was employed. The nitrogen levels were 0, 0.50, 1.00, 2.00, 3.00 and 4.00kgN per are ; and the regrowth periods were 3, 5 and 7 weeks respectively. Plot size was 1.75m×2.00m with an effective size of 1.50m×1.75m. Dry matter yield increased with increasing regrowth period. With increasing fertilizer level, dry matter yield increased at 7 weeks of regrowth but showed a decreasing trend with shorter regrowth periods. Nitrogen content increased with increasing fertilizer level but decreased with increasing regrowth period. Nitrogen recovery rates were lower at the higher fertilizer levels but increased with increasing regrowth period. All the cell wall constituents decreased with increasing fertilizer level at 3 weeks but increased with increasing regrowth period. Acid detergent lignin (ADL) content of the fertilized group was higher than that of the control by the seventh week though the differences were not significant. In vitro dry matter digestibility (IVDMD) decreased with increasing regrowth period (p<0.01). IVDMD significantly increased with increasing nitrogen level at 3 weeks but not at other periods.

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