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实践证明,低温冷害对高粱产量的影响极大。为了进一步认识低温冷害的自然规律,我们分析研究了我县1958—1977年20年的气象资料和高粱平均单位面积产量资料以及县农科所1970—1977年的试验结果。分析方法:以相关系数法和回归方程求总的趋势。高梁丰歉年类型按产量比率划分,产量>110%,90—110%,<89%分别划分为丰、平、歉三种类型。并提出丰、平、歉年≥10℃活动积温指标,依此预报年景的丰歉。一、低温冷害发生的规律20年来的丰年频率为30%,平均亩产270.7斤,平年频率为25%,平均亩产146.6斤;歉年频率为45%,平均亩产95.4斤。20年中有六丰、五平、九歉的年景。歉年由旱、涝、低温和早霜等自然灾害所致,而低温是主要的。9个歉年中,低温冷害就有7年,占歉年的77.8%。≥10℃的活动积温低于2,400℃为低温年指标,低于2,250℃为重低温年指标,2,401℃—2,550℃为平年指标,高于2,550℃为丰年指标。低温
Practice has proved that chilling injury has a great impact on sorghum production. In order to further understand the natural law of chilling damage, we analyzed and analyzed the meteorological data of 20 years from 1958 to 1977 in our county, the average yield per unit area of sorghum and the experimental results of the county agricultural station from 1970 to 1977. Analysis method: The correlation coefficient method and regression equation to find the overall trend. Liang Liang abundance year types of output divided by yield, yield> 110%, 90-110%, <89% were divided into abundance, flat, apology three types. And Feng, Ping, apology year ≥ 10 ℃ activity temperature indicators, so forecast the year’s apology. First, the law of occurrence of chilling injury 20 years of abundance frequency of 30%, average yield 270.7 pounds, the average annual frequency of 25%, average yield 146.6 kg; the frequency of 45% apologies, the average yield 95.4 pounds. 20 years in six abundance, five flat, nine apology year. The year of apologies is caused by natural disasters such as drought, waterlogging, low temperature and early frost, while low temperature is the major one. In nine years of apology, there were seven years of chilling injury and 77.8% of the year of apology. The active accumulated temperature of ≥10 ℃ is lower than 2,400 ℃ for low temperature, lower than 2,250 ℃ for heavy low temperature, 2,401 ℃ -2,550 ℃ for normal, and higher than 2,550 ℃ for good harvest. Low temperature