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淮北地区春播玉米制种花期都在7月上中旬。此时,日极端最高气温达32℃玉米制种就会出现受害。以本场为例,1987年正当玉米制种田散粉盛期连续4天32.2—33.5℃高温,亩产比1986年减产15%.1988年花期(7月1—9日)出现31°—38℃高温8天,亩产又比1987年减产52%.1988年7月初至下旬前期高温酷热遍及南方大部地区.玉米制种普遍减产,江苏省4万多亩制种田,亩产较1987年下降2.8%.本文特对近5年的调查结果试作分析,并提出预防措施.
Huaibei spring seeding corn flowering in July on the middle. At this point, the extreme maximum temperature reached 32 ℃ corn seed will suffer. Taking this field as an example, in 1987, when corn flour was put into operation, it was 32.2-33.5 ℃ high temperature for four days in a row, and its yield per mu was 15% lower than that of 1988. The flowering period of 1988 to July 31-9 was 31 ° -38 ℃ 8 days of high temperature and 52% less per mu than 1987. In early July and early July 1988, the high temperature and heat spread throughout most of the southern part of the country.The maize production was generally reduced, and the output of more than 40,000 mu in Jiangsu Province was lower than that in 1987 2.8% .This article specializes in the past five years of the pilot test analysis, and put forward preventive measures.