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在俄克拉何马和得克萨斯的贫瘠垦地上种植了上万公顷的孔颖草(Bothriochloa spp.),但对其再生草的产量和品质却了解甚少。为此从5月初到9月中旬,每周收获4周龄的白白羊草(B.ischaemum[L.]Keng)和孔颖草(B.caucasica[Trin.]C.E.Hubb.)的再生草,测定茎、叶的产量及品质,以得到季节模型。试验设4个区组,每区组中各牧草种又设4个小区(总32小区),在1988～1989年的2年时间内,从各区组1～4小区内每周轮流收获4周龄再生草,测定牧草再生草茎、叶的体外干物质表观消化率(IVDMD)和粗蛋白(CP)。在2年时间里两种牧草再生草产量6月份最高。而1988和1989年8月份再生草产量只占6月份的10％和35％。白羊草4周龄的再生草产草量在1988和1989年分别比孔颖草高80％和45％。叶再生量分别高75％和28％。茎产量在2年时间内都是孔颖草的2倍。叶和茎的IVDMD平均比孔颖草高2％～6％,在5月和6月内叶CP平均高2％。然而,白羊草茎的CP比孔颖草低1％。放牧管理计划需考虑牧草的大部分生产集中在6月份这一个月的时间,在牧草生长季节采用每周收获4周龄再生草的取样技术是建立季节再生模型的一个有效方法。
Thousands of hectares of Bothriochloa spp. Have been planted on barren land in Oklahoma and Texas, but little is known about the yield and quality of their reclaimed grasses. For this purpose, four-week-old regenerated grasses of B.ischaemum [L.] Keng and B.caucasica [Trin.] CEHubb. Were harvested weekly from early May to mid-September. The stem and leaf yield and quality were measured to obtain the seasonal model. Four groups were set up in the experiment. Four forage species (total 32 plots) were set up in each group. In the two years from 1988 to 1989, the foci were harvested weekly for 4 weeks Aged regenerated grass, the in vitro dry matter apparent digestibility (IVDMD) and crude protein (CP) of the grass and leaf of grass regeneration were measured. In two years the grass production of the two grasses was the highest in June. While reclaimed grass production in August 1988 and August 1989 only accounted for 10% and 35% of June respectively. The 4-week-old replanted grass production of A. chinensis was 80% and 45% higher than that of P. kirilowii in 1988 and 1989, respectively. Leaf regeneration was 75% and 28% higher. Stem production in 2 years are 2 times Kong Ying Cao. The average IVDMD of leaves and stems was 2% -6% higher than that of Kobresia gracilis and 2% higher on average in May and June. However, the CP of Arnebiaceae stems is 1% lower than that of Pomace culture. Grazing Management Plans Need to Consider Most of herbage production is concentrated in the month of June, and the sampling technique of harvesting 4-week-old regenerated grasses in the forage growing season is an effective way to establish a seasonal regeneration model.