臂形草属牧草种子生产试验

采用L25(5^6)正交表，进行了提高臂形草牧草种子产量的试验研究。以臂形草品种、施尿素、抽穗期施硼砂，初花期施硼砂为影响因子，各因子5个水平，作正交试验和统计分析。结果表明：通过2a试验,杂交臂形草种子产量最高。第1年为868．6kg／hm，第2年为303．1kg／hm，第1年氮肥不同处理水平间的种子产量差异不显著，但第2年种子产量随着尿素施肥量的增加而提高。抽穗期施硼砂不论在第1年，还是在第2年均可提高种子产量。抽穗期喷施质量分数1．0％硼砂，产量最高第1年为385．3kg／hm，第2年为208．1kg／hm。初花期施硼砂对种子产量效果不显著。

Seed Production of Brachiaria

A study was made of improvement of seed production of Brachiariaby a L25 (56) orthogonal method. An orthogonal experiment was carried out with Brachiaria varieties, urine, borax applied during the heading stage, borax applied during the initial flowering stage as factors, 5 levels each factor. Statistic analysis of the experiment showed that Brachiaria hybrid had the highest seed yield among the five cultivars over the two years of trials, 868.6 kg/hm2 in 2001 and 303.1 kg/hm2 in 2002. Seed yield of Brachiara was improved with the application rate of urea in 2002, but was not different among five cultivars in 2001. Seed yield was improved during two years of trials when borax was applied in soil at 1.0 % during the heading stage, but seed yield was not increased with borax application during the first flowering period.