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我场1964年开始配制玉米双交种维尔42,1966年又引入维尔156双交种和整套制种材料,当年种植维尔156共2,350亩,单产688斤,比未推广杂交种的1957年玉米亩产433.1斤,增产58.8％。从1966年开始全场实现了玉米杂种化,种植面积逐年扩大,产量逐年提高,1971年杂交玉米种植面积上升到12,119亩,平均单产610斤,玉米产量占粮食总产的31％,农五队种植的534亩,单产1,014斤,其中3.38亩高产田达到1,254.2斤,其他生产队也出现了不少大面积千斤以上的高产纪录。但是,一个优良品种经过几年种植以后,会发生混杂、退化、变劣等现象,尤其表现在亲本自交系上。据观察,维尔156四个亲本(157、158、133、64)出现以下现象:(1)植株生长不齐,株形和叶色不一;(2)果穗有大有小,秃尖严重,籽粒品质变劣;(3)成
My field began in 1964 corn double-breed Verne 42, 1966 introduced Weir 156 double crosses and the entire system of seed materials, planting a total of 2,350 acres of 156 Virgin, yield 688 pounds, less than the promotion of hybrids in 1957 acres of corn Production 433.1 pounds, an increase of 58.8%. Since 1966, the corn hybridization has been realized throughout the year. The planting area has been expanding year by year with the output increasing year by year. In 1971, the acreage of hybrid corn rose to 12,119 mu, with an average yield of 610 kg and corn yield accounting for 31% of the total grain output. 534 acres planted, yielding 1,014 catties, of which 3.38 acres of high-yield fields reached 1,254.2 pounds, other production teams also appeared in a lot of large-area overweight record of high yield. However, after a few years of planting a good variety, there will be some phenomena such as confusion, degradation and deterioration, especially in the inbred lines of the parents. It is observed that the 156 phenotypes of Vir 156 (157,158,133,64) show the following phenomena: (1) the plants grow irregularly, and the plant shape and the leaf color are different; (2) The ears are large and small, Grain quality deterioration; (3) into