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一 以往进行播种期试验的成果 解放前,由于生产水平低,播种技术及耕作管理粗放,棉花的播种期一般多在立夏前后(五月上旬)。解放后,随着栽培技术的不断提高,上述播种期已显得较迟,群众在生产实践中体会到了早播的好处,也已逐渐地把播种期提早。据一九五三到一九五五年在河北、山西调查结果,四月下旬播种比五月上旬播种的棉花生育早,产量高,肯定了提早播种的优越性。但是,(?)要提早到四月上、中旬播种,当时尚无充分依据,因此于一九五六到一九五七年在全国绝大多数农业试验站都进行了此项研究工
Prior to the liberation of the results of a previous sowing experiment, the sowing period of cotton was generally before and after the beginning of the summer (early May) due to the low level of production, extensive sowing techniques and tillage management. After the liberation, with the continuous improvement of cultivation techniques, the above sowing dates have been delayed. The masses have realized the benefits of early sowing in their production practices and have gradually begun to sow the sowing date earlier. According to the findings of 1953 and 1955 in Hebei and Shanxi, planting in early April was earlier than that of cotton sowing in early May, yielding high yields and affirming the superiority of early sowing. However, as early as April and mid-seeding, there was no adequate basis at that time and the study was carried out at most agricultural pilot stations in China from 1956 to 1957