我们大队从一九五七年引进英粒子,山垣地种植二十多年,由于人为混杂和自然变异的结果,穗轴变粗,子粒变园,严重退化,产量下降。一九七四年从天水地区农科所又引进吉林英粒子一斤,隔离繁殖两年,表现比当地英粒子棒大轴细,粒长马齿,优质高产,受到群众喜爱。为了保持其优良种性,七五年我们农科站就开始用半分法,坚持提纯复壮到现在,所产的原种,产量显著提高。七六年二亩二分原种田,单产五百四十七斤,七七年提高到六百一十三斤,比未提纯复壮的四百七十七斤增产百分之二十八点三。经过几年的努力,复壮英粒子已在全大队更换了一次,今年给全县提供种子一万多斤。 Our brigade introduced British particles from 1957 and planted them for more than 20 years. As the result of man-made miscellaneous and natural variations, the cob became thicker, the seeds became a garden and seriously degenerated, yielding a decline. In 1974, from Tianshui Agricultural Science Institute and the introduction of Jilin Ying particles pound, isolated breeding two years, the performance than the local British particle rod large shaft fine, long grain teeth, high quality and high yield, by the masses favorite. In order to maintain its good nature, in 1975 we began to use semi-sub-branch agricultural law, insisted purification and rejuvenation to the present, the production of the original species, significantly increased production. In 1976, the output of two-acre farming in two acres was 547 kilograms, rising to 613 kilograms in 1977 and 28.3 percent more than the 477 kilograms of non-purified and rejuvenated plants. After several years of efforts, rejuvenation of the British particles have been replaced once in the entire brigade, this year to the county to provide seed ten thousand kilos.