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水稻收割,必须达到完全成熟。在当地中晚熟(谷雨节直播,8月16～25日抽穗)品种,如津稻1187、中作321、中系8215、津稻681等,正常成熟(不受病虫害、不早衰或遭霜冻等障碍性因素),在抽穗后,大于15℃积温应达到1200～1300℃(高于30℃或低于15℃时,对结实不利),日照时数为400～500小时,结实日数,约在抽穗后55～60天。从稻穗外部形态看,谷粒全部变硬,穗轴上干下黄,有2/3枝梗已干枯,达到这
Rice harvesting must reach full maturity. In the local middle and late-maturing (Guyu Festival live, August 16 ~ 25 heading) varieties, such as Tianjin rice 1187, in 321, 8215, Jindi 681, etc., normal maturity (without pests, premature aging or frost etc. Barrier factors), after heading, the accumulated temperature of more than 15 ℃ should reach 1200 ~ 1300 ℃ (higher than 30 ℃ or below 15 ℃, the strong negative), the sunshine hours of 400 to 500 hours, the number of days of strong, about 55-60 days after heading. From the external appearance of the rice panicle, all harden the grain, cob dry yellow, 2/3 branch stems have dried up to