二棱皮大麦分蘖及成穗规律的研究

Studies on Tillering and Ear Formation in Two-rowed Barley(Hordeum Vulgare L. )

在适宜播期范围内，大麦出苗后２０ｄ左右，芽鞘节就开始分蘖。半冬性品种（包括弱春性品种）．其分蘖期约６６～７５ｄ，占全生育期的３７％～４２％，其中有效分蘖期占１３％～１９％。各级分蘖的成穗数占总成穗数的比值，主穗占２６％～２７％，一级蘖穗占３９％～６０％，其中Ⅰ和Ⅱ蘖成穗占３３％～５８％。为了实现丰产目标，应须选育分蘖力中等，成穗率高的品种。栽培上要求施足底肥，促壮苗早发，控制二、三级分蘖滋生，办调好个体与群体问的发育关系。

Within prper sowing date,the coleoptile nede began to tiiler following 20 d petorior to barleyseedling emergence. The tillering time of semi-winter varieties(included weak spring varieties)Iastad about 66～75d. Tillering time and offective tillering time amounted for 37%～42%and 13%～19% of life span respective-ly ,Among rates of the fertile ear number of various levels of tillers versus the total fertile ear number, the mainears amounted for 26%～27%,the primary tillering ears amounted for 39%～60%,of whicb both lst and 2ndtillering ears amounted for 33%～58%. The variety, whose tillering ability was intermediate and fertile ear ratewas high, shoule be choosed to realize the high-yielding obju=ective. In cultivation, it was necessary to apply basefertilizers sufficiently, stimulate vigorous seedling to germinate early, inhibit the secondary and tertiary ears to mul-tiply,coordinate the favorable development relation between the individual plant and population.