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宝鸡市1987年油菜面积36.73万亩,平均亩产100kg,总产36602吨;亩产、总产分别比1986年减产7.4％和19.7％,较丰收的1985年分别减产20.0％和15.5％,直接经济损失860万元。灾情较重的县有扶风、凤翔、岐山、眉县等,以东部高水肥密植地减产最重,西部旱薄稀植地减产较轻。为了更好地吸取教训,我们对1987年油菜减产原因进行了浅析。一、油菜减产原因根据试验示范和生产调查(表1),在油菜产量构成的四个因素中,1987年油莱减产主要是由于千粒重降低所引起的,其原因主要有以下三方面:
In 1987, the area of rapeseed in Baoji was 367,300 mu, with an average yield of 100kg per mu and a total output of 36,602 tons. The mu production and the total output were 7.4% and 19.7% less than those in 1986 and 20.0% and 15.5% lower respectively in the bumper crop in 1985 and directly Economic loss of 8.6 million yuan. The hardest hit counties were Fufeng, Fengxiang, Qishan and Meixian, with the largest decrease in output of fertilizers and fertilizers in the east and the lesser loss of dryland and thin sparse land in the west. In order to better learn the lesson, we analyzed the reasons for the decline of 1987 rape. First, the rapeseed production reasons According to the pilot demonstration and production survey (Table 1), the rapeseed yield of the four factors, the 1987 oil yield reduction is mainly due to the reduction of 1000-grain weight caused by its main reasons are the following three aspects: