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关中棉区多年来产量较低,年际变化较大。影响产量低而不稳的原因,除栽培措施外,更主要的是与气候条件有密切关系。本文仅以经阳县1955—1981年的气候和产量为例,结合近几年的试验资料,重点研究气温与降水对棉花的关系问题。一、积温与高低温问题径阳县属暖温带大陆性季凤气候,棉花生长期间(5月1日一10月20日)日平均气温21.4℃,≥15℃的日数158天,活动积温平均3636.7℃,最多年份3974.2℃,最少的年份3194.8℃。具有80％保证率的积温3511℃。处于发展中熟品种的下限,尚有19.2％的年份积温不足。
The Guanzhong area has a low yield over many years and a large interannual change. Affect the low yield and instability reasons, in addition to cultivation measures, the more important is closely related with climatic conditions. This paper, taking the climate and output of 1955-1981 in Jingyang County as an example, combines the experimental data in recent years with emphasis on the relationship between temperature and precipitation on cotton. First, the accumulated temperature and high temperature problems Wenyang County is a warm temperate continental monarch climate, the cotton growing period (May 1 to October 20) average daily temperature of 21.4 ℃, ≥ 15 ℃ days 158 days, the average activity temperature 3636.7 ℃, the maximum year of 3974.2 ℃, the minimum year of 3194.8 ℃. With a 80% guaranteed temperature of 3511 ℃. At the lower end of the maturing varieties, there are still 19.2% of the year lack of accumulated temperature.