论文部分内容阅读
成秧率低,是早稻生产上的一大障碍,不但增加了早稻用种量,浪费了良种,增加了生产成本,而且贻误农时,打乱作物布局,使生产计划不能顺利地完成,给早稻生产,甚至全年生产带来了极大的被动。因此,提高早稻成秧率,已经成为发展早稻生产上的一项重要任务。 一、早稻成秧率的年际和地域变化 早稻育秧阶段,不同地区年际之间气候条件不同,栽培条件不一,带来早稻成秧率年际和地区间的很大差异。据沅江县近五年的资料统计,成秧率最高的1982年平均达到84.5％,最低的1980年和1983年分别只有59.4％和59.8％。同一年份不同地域之间差别更大。由于年际之间早稻成秧率不同,造成用种量差别很大。据地处洞庭湖区的南县、沅江、益阳三县统计,用种量最少的1982年,每亩大田用种只30斤,而用种量最多的1980年达到50斤左右。1983年有的农户每亩大田用种量达到70多斤。
The low rate of planting seedlings is a major obstacle in the production of early rice. It not only increases the amount of rice used in early rice but also is a waste of good seeds and increases the production cost. Moreover, when it is detrimental to agriculture, the layout of crops is disrupted and the production plan can not be successfully completed. Production, and even annual production has brought great passive. Therefore, raising the rate of early rice seedling has become an important task in the development of early rice production. First, the early rice rice planting rate of interannual and regional changes Early rice nursery stage, different regions of the inter-year climatic conditions vary, different cultivation conditions, bringing about the rate of early rice seedling annual and inter-regional differences. According to statistics of Yuanjiang County in the past five years, the highest rate of planting rice reached an average of 84.5% in 1982, with the lowest in 1980 and 1983 being only 59.4% and 59.8% respectively. In the same year, the differences between different regions are even greater. As a result of inter-year early rice into different rates, resulting in a large difference in the amount of use. It is located in the Dongting Lake area counties, Yuanjiang, Yiyang three counties, with the least amount of planting in 1982, per acre field with only 30 kg, while the largest species in 1980 reached 50 pounds. In 1983, some farmers used more than 70 kilos of grassland per mu.