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种植于温暖地区的温带牧草,由于夏季是淡季,产量下降,本来是多年生草种,多作为一年生草种利用。据山田报道,温带牧草在温暖地区夏季产量少的主要原因是高温和干旱。月均温在25℃以上,30℃以上的高温天数超过15天的地区,温带牧草将出现夏季淡季。在日本,关东南部地区以南的平坦地属这类地区,特别是濑户内、四国、九州的部分平坦地受高温威协较大。战后,在日本温暖地区畜牧业振兴时期,人们对如何防止温带牧草夏季淡季
The temperate forages planted in warm regions are originally perennial grasses and are mostly used as annual grasses due to the off-season summer season and declining production. According to Yamada, the main reason that temperate pasture yields less in summer in warm areas is high temperature and drought. Temperate pasture will appear in the summer off-season in areas where the average monthly temperature is above 25 ℃ and the high-temperature days above 30 ℃ exceed 15 days. In Japan, the areas south of Kanto south are flat, and the parts of Seto, Shikoku and Kyushu are relatively flat under the influence of high temperature. After the war, in the period of rejuvenation of livestock husbandry in warm areas of Japan, people are concerned about how to prevent the temperate pasture summer off-season