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引言上海郊区后季稻有200多万亩,占秋粮总面积的80%左右,在粮食生产中占有举足轻重的位置。由于本市热量条件,一年种三熟较勉强,后季稻生产季节历来十分紧迫,早栽田块产量高而稳,晚栽田块产量很低,在温度偏低的年份,往往遭受到低温危害而严重减产。近年来,由于早栽面积减少,晚栽面积增多,加之气候反常,造成较大幅度的减产。本文以1981年和1982年的试验结果为基础,探讨了后季稻不同类型品种的移栽期与单位面积产量之间的数量关系,以期为合理安排后季稻生产,提供理论依据。
Introduction The suburb rice crop in Shanghai suburbs has more than 2 million mu, accounting for about 80% of the total area of autumn grain, occupying a pivotal position in grain production. Due to the calorific condition of this Municipality, one year’s three crops are rather reluctant, and the production season of late rice has always been very urgent. The yield of early-planted plots is high and stable, and the output of late-planted plots is very low. In the years with low temperature, Low temperature damage and serious cut. In recent years, due to the reduction of early planting area, late planting area increased, combined with the anomalous climate, resulting in a more substantial yield reduction. Based on the test results in 1981 and 1982, this paper discussed the quantitative relationship between the transplanting period and yield per unit area for different types of cultivars of post-season rice so as to provide a theoretical basis for the rational arrangement of post-season rice production.