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我国早春水稻的烂秧问题较突出,对烂秧研究也较活跃,进展较快。然而对各生态因子在烂秧中的作用特点以及相互关系还一直缺乏明确认识,对防治方法也有不同看法。为此,利用人工气候箱及其它可控条件开展了水稻烂秧生态因子的作用特点及其与防治方法关系的研究。材料与方法用“珍珠矮11号”和“桂朝2号”两个品种。典型的水稻土经风干粉碎后盛于直径15.5厘米的瓦钵或塑料盆。瓦钵盛土900克,塑料盆分别盛土700克、1400克和2100克。浸种催芽后在盆钵上按格逐粒点播约100粒种(相当每亩170斤)。秧龄达2—3叶时进行逐步降温和逐步升温的低温处理。3批试验的主要参数如表1。每批之中又分若干随机区组试验。自低温开始起逐日登记死苗率。同一试验中不同处理对死苗影响的差异用3个指标来量度。a是达到50％死苗的时间差异,b是最后死苗率差异,c是同一天死苗率的最大差异(图1)。对试验的数理统计用TRS-Ⅲ型计算机进行。
The problem of rotten seedling of rice in early spring in our country is more prominent, and the research on rotten seedling is also more active and progressed rapidly. However, there is a lack of a clear understanding of the roles and relationships of various ecological factors in rotten seedlings and different views on the prevention and treatment methods. To this end, the use of artificial climate chamber and other controlled conditions carried out the role of ecological factors of rotten rice seedlings and its relationship with the prevention and treatment methods. Materials and methods with “Pearl short 11” and “Gui Chau 2” two varieties. Typical paddy soil is air-dried and crushed in a 15.5 cm diameter bowl or plastic basin. 900 grams of pots Sheng Sheng, plastic pots were soil 700 grams, 1400 grams and 2100 grams. Seed soaking in the pot after the germination of the order by the grid on-demand about 100 species (equivalent to 170 pounds per mu). Seedlings 2-3 leaves when the gradual cooling and gradual warming of the low temperature treatment. The main parameters of the three batches of tests are shown in Table 1. Each batch is divided into several randomized block test. From the beginning of hypothermia daily registration of dead seedlings rate. In the same experiment, the effects of different treatments on dead seedlings were measured with three indexes. a is the time difference up to 50% dead seedlings, b is the difference in the last seedling rate, and c is the maximum difference in the death rate on the same day (Figure 1). Mathematical statistics on the test using TRS-III computer.