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以近年来北京市更新换代的京科968等6个品种为试验材料,研究适宜这些品种的最佳播期和密度。结果发现春播品种京科968密度控制在4000株/667m2较适宜,在5月10日播种,子粒千粒重和穗粒重最高,产量水平最高;春播品种联科96密度控制在4000株/667m~2,在4月30日播种,产量水平最高;春播品种农华101密度控制在4000株/667m~2,在4月20日和5月10日播种,产量水平较高。夏播品种京农科728在高密度条件下产量水平较高,尤其是6000株/667m~2密度下,产量最高,达到699.9kg/667m~2,同时田间倒伏倒折率保持较低水平,是一个耐密型品种,夏播品种旺禾8号不适宜高密度种植,可以针对特殊区域进行种植。京单68产量水平较高,较耐密植,高抗倒伏,可以在一些区域作为替代品种进行种植推广。
Taking Beijing Branch 968, which is a replacement of Beijing in recent years, 6 varieties as test materials, the optimum sowing dates and densities for these varieties were studied. The results showed that density control of spring sowing varieties Beijing Branch 968 was more suitable for 4000 lines / 667m2, sowing on May 10, the highest grain yield and grain weight were the highest; the density of spring sowing lines was 96 lines / 667m 2 , And sowed on April 30, with the highest yield. The density of spring sowing Nonghua 101 was controlled at 4000 plants / 667m ~ 2 and sown on April 20 and May 10 with a higher yield. In summer sowing varieties, Jingnong 728 had a higher yield under high density conditions, especially 6,000 / 667m 2, with the highest yield reaching 699.9kg / 667m ~ 2, while the field lodging rate of rewinding remained at a low level, Is a tight-resistant varieties, summer sowing varieties Wang Wo 8 is not suitable for high-density planting, can be planted for special areas. Beijing single 68 higher yield levels, more tolerant to dense, high lodging resistance, can be used as a substitute in some areas to promote planting.