Effect of Cutting Frequency on Forage Production in the Green Panic and Phasey Bean Mixed Culture

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  • グリーンパニックとファゼービーンとの混播栽培における刈取回数の効果
  • グリーン パニック ト ファゼービーン ト ノ コンパン サイバイ ニ オケル

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Abstract

A field experiment was conducted in Fukuoka, Japan, to evaluate the effect of cutting frequency on dry matter yield, botanical composition, nutritive value and canopy structure in pure and mixed culture swards of green panic (Panicum maximum var. trichoglume cv. Petrie), and phasey bean (Macroptilium lathyroides). The mixed culture consisted of a 2:1 ratio of grass to legume. In all plots plant density was 100 per m^2. In both pure and mixed cultures, 4 times, 3 times, twice and once cutting frequency were employed. Cumulative dry matter yields showed significant differences among cutting frequencies, but did not between pure and mixed cultures. Cumulative dry matter yield of the mixed culture under 3 cutting frequency out-yielded the green panic pure culture. The proportion of phasey bean in cumulative dry matter yield of mixed culture was 9.9% under 3 cutting frequency, but reduced to 2.0% under twice and once cutting frequencies. The relative yield total (RYT) was 1.2 under 3, 1.0 under 4, lower than 1.0 under twice and once cutting frequency respectively. The relative yield (RY) of each component in mixed culture pointed out that green panic suppressed phasey bean when the cutting interval was prolonged. Nitrogen percentage under 3 cutting frequency in mixed culture was 0.54% units higher than in the green panic pure culture, which was the highest among all cutting frequencies. Nitrogen yields under 4 and 3 cutting frequencies in mixed culture were higher than the respective pure cultures. Under 3 cutting frequency, in vitro dry matter digestibility in the mixed culture was higher than in the green panic pure culture by 3-8% units, and digestible dry matter yield in the mixed culture exceeded those of the pure cultures. Canopy structure and light interception profile under 3 cutting frequency in mixed culture showed efficient utilization of the above ground space. This may be one of the advantage bringing about the out-yielding of dry matter.

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