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在毛主席革命路线指引下,我区杂交水稻已经进入到积极试种、稳步推广的阶段。为了解杂交水稻对气候条件的要求,一九七六年晚造,我们在一九七五年试验的基础上,进行了汕优桂选7播期试验。观察不同播期与生育期及产量的关系,分析不同播期在抽穗扬花期受不同低温危害后对结实率的影响,研究抗御寒害的措施。试验分三期播种,秧龄均30天,管理大体一致。第一期6月30日播,7月30日插(下称第一播期);
Guided by Chairman Mao’s revolutionary line, hybrid rice in our region has entered into a phase of active cultivation and steady promotion. To understand the climatic conditions for hybrid rice requirements, made in late 1976, we based on the experiment in 1975, conducted a sowing date Shanyou 7 sowing date. The relationship between different sowing dates and the growth period and yield was observed. The effects of different sowing dates on the seed setting rate at heading and flowering stage under different low temperature were analyzed. Tests were divided into three seeding, seedling age 30 days, management generally consistent. The first broadcast on June 30, July 30 plug (hereinafter referred to as the first broadcast period);