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一、藻类及其为害水田的自然环境給藻类帶來了极其有利的生活条件。自从水稻播种到收护,自始至終地貫穿着各种藻类的生長及其为害。水田中存在的藻类一般为綠藻类。这些藻类在高溫高湿的自然条件下,尤其在有机質含量多的水田中,長得非常猖獗。藻类在水稻田中发生的时間,早稻(是插秧)后的7—10天內,各种藻类复盖面积达5％左右。再过10天,竟发展到8—10％。这种情况在晚稻田中更为严重,这是因为晚稻在移植于本田后的二十几天气溫甚高(一般都在30℃左右)的緣故。
First, the natural environment of algae and its harmful paddy fields bring extremely favorable living conditions to the algae. Since the sowing and harvesting of rice, the growth and damage of various kinds of algae have been penetrated throughout. Algae present in paddy fields are generally green algae. These algae grow very rampant under natural conditions of high temperature and humidity, especially in paddy fields with high organic matter content. Algae occurs in paddy fields in the time, early rice (transplanting) after 7-10 days, a variety of algae covered an area of about 5%. In another 10 days, it actually developed to 8-10%. This situation is even more severe in the late rice fields because of the very high temperature (usually around 30 ° C) in late 20 days after transplanting to Honda.