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1981年天津、河北、河南、山东等省市,预计种植京早七号玉米良种三百余万亩。现将1979、1980两年的分期播种试验有关资料整理如下,供各地引种京早7号时参考。夏玉米生长季节短,8月中旬以后气温渐降,9月下旬又需接茬种麦。实践证明,早播是增产的关键,但迄今有关的资料很少,对不同播期条件下玉米的生育规律,特别是籽粒灌浆同温度的关系看法还不一致。为此,我们进行了京早七号分期播种试验。试验在我院农场进行,1979年的10个不同播种期处理(详见表1),每小区面积1分地,
In 1981, Tianjin, Hebei, Henan, Shandong and other provinces and cities are expected to grow more than three million mu of Jingzao 7 maize seed. Now 1979,1980 two-year sowing trial of the relevant information compiled as follows, for the introduction of Beijing early on the 7th reference. Summer corn growing season is short, the temperature gradually decreased after mid-August, September and then need to pick the next wheat. Practice has proved that early sowing is the key to yield increase, but little information has so far been found on the sowing date of maize under different sowing dates, especially the relationship between grain filling and temperature. To this end, we conducted a trial of sowing in Beijing on the 7th staging. The experiment was carried out in the farm of our hospital. The treatment of 10 different sowing dates in 1979 (see Table 1 for details)