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(一) 冀东平原粮区种植制度,由建国初一年一收逐步演变为目前的两年三收与一年两收,从而使粮食产量逐步上升。经计算,1965～1980年本区主要县份夏粮占粮田面积比率的增加,与夏粮占粮食总产比率的相关系数均在+0.8以上,显著性测定也达极显著。扩种夏粮提高粮食单产,一方面要看两茬中的上茬(夏粮)本身的产量,同时也要看到下茬(秋粮)的产量。两者合计才
(1) The planted grain planting area in the Jidong Plain gradually evolved from a one-year harvest in the early days of the founding of New China to two crops in the current two years, three crops in a year and two crops in a year, thereby gradually increasing grain output. According to the calculation, from 1965 to 1980, the ratio of summer grain to the area of grain increased in major counties in this area, and the correlation coefficient between summer grain and total grain yield was above +0.8, and the significant test was also significant. Expansion of summer grain to increase grain yields, on the one hand depends on the two stubble in the crop (summer grain) itself, but also to see the next crop (autumn grain) production. Taken together