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我埸稻田混杂大量杂草是水稻低产的原因之一,尤其是三稜草(莎草科),平均每平方米有516株,每亩有34万多株。 1958年我们进行的试验表明,以2·4·5—涕钠盐除草,可以获得良好的效果(主要是抑制三棱草,对子无效);并对稻苗完全没有伤害。而喷2.4—滴钠盐则无效。使用除莠剂的时间是7月5日,当水稻分蘖和三稜草结实、植株露出水面15—25厘米的时候。药量分为每亩0.06公斤、0.13公斤、0.2公斤三种处理。兹将试验结果列於表一和表二。
One of the reasons for the low yield of rice is the large number of weeds mixed with rice in the paddy field. In particular, the genus Prism (Cyperaceae) has an average of 516 plants per square meter and more than 340,000 plants per mu. Our experiments conducted in 1958 showed that weeding with the sodium 2,4-diphosphate could give good results (mainly the inhibition of the trifoliate weeds, para-pair nullification) and no damage to the seedlings. Spray 2.4-drop sodium is invalid. The time to use herbicides is July 5, when the rice is tillering and the hibiscus is strong and the plants emerge 15-25 cm above the water. The dose is divided into 0.06 kilograms per mu, 0.13 kilograms, 0.2 kilograms three kinds of treatment. The test results are shown in Table I and Table II.