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众所周知,区域试验中各参试品种必须分积温带,既按不同熟期进行试验。一般都公认晚熟品种一旦安全成熟,均较早熟品种高产。日本学者在这方面进行了卓有成效的研究。笔者曾在日本青森县十和田市藤坂试验支场,利用当地安全熟期品种和晚熟品种以及黑龙江农科院水稻所品种作参考,共9个品种进行试验。试验的结果有如下倾向:在同一光温型的品种中,生育期长的比生育期短的高产。笔者考虑全球变暖的趋势以及有效利用积温的问题有如下考虑:
As we all know, the regional test of each test varieties must be divided into temperate zone, both according to different maturity test. Generally recognized late maturing varieties, once safe and mature, are more mature varieties of high yield. Japanese scholars conducted fruitful research in this area. I used to study at Fujisaka Test Shizuoka, Towada, Towada, Aomori prefecture, Japan. Nine varieties were tested with reference to the local varieties of safety maturing and late-maturing varieties and the varieties of rice in Heilongjiang Academy of Agricultural Sciences. The results of the experiment tended to be as follows: Among the same light and temperature type varieties, the long-term growth period was shorter than the growth period. I consider the trend of global warming and the effective use of accumulated temperature issues are as follows: