问题 问答题 简答题

怎样应用农达和克无踪?

答案

参考答案:

农达就是草甘膦水剂,克无踪就是百草枯。

1.农达使用要点

使用方法:草甘膦接触绿色组织后才有杀伤作用。由于各种杂草对草甘膦的敏感度不同,因而用药量也不同。

1.果园、桑园等除草防除1年生杂草每亩用10%水剂0.5-1公斤,防除

多年生杂草每亩用10%水剂1-1.5公斤。对水20-30公斤,对杂草茎叶定向喷雾。

2.农田除草农田倒茬播种前防除田间已生长杂草,用药量可参照果园除草。棉花生长期用药,需采用带罩喷雾定向喷雾。每亩用10%水剂0.5-0.75公斤,对水20-30公斤。

3.休闲地、田边、路边除草于杂草4-6叶期,每亩用10%水剂0.5-1公斤,加柴油100毫升,对水20-30公斤,对杂草喷雾。

4.对于一些恶性杂草,如香附子芦苇等,可每亩地按照200克加入助剂,除草效果好。

克无踪使用要点使用方法:

1.果园、桑园、茶园、胶园、林带使用在杂草出齐,处于生旺盛期,每亩用20%水剂100-200毫升,对水25公斤,均匀喷雾杂草茎叶,当杂草长到30cm以上时,用药量要加倍。

2.玉米、甘蔗、大豆等宽行作物田使用可播前处理或播后苗前处理,也可在作物生长中后期,采用保护性定向喷雾防除行间杂草。播前或播后苗前处理,每亩用20%水剂75-200毫升,对水25公斤喷雾防除已出土杂草。作物生长期,每亩用20%水剂100-200毫升,对水25公斤,作行间保护性定向喷雾。

选择题
阅读理解

阅读理解。

     Let children learn to judge their own work. A child learning to talk does not learn by being corrected all the

time: if corrected too much, he will stop talking. He notices a thousand times a day the difference between the

language he uses and the language those around him use. Bit by bit, he makes the necessary changes to make

his language like other people's. In the same way, children learning to do all the other things: they learn to do

without being taught to walk, run, climb, whistle, ride a bicycle, compare their own performances with those

of more skilled people, and slowly make the needed changes. But in school we never give a child a chance to

find out his mistakes and correct them for himself. We do it all for him. We act as if we thought that he would

never notice a mistake unless it was pointed out to him, or correct it unless he was made to. Let him work out,

with the help of other children if he wants it, what this word says, what the answer is to that problem, whether

this is a good way of saying or doing this or not.

     If it is a matter of right answer, as it may be in mathematics or science, give him the answer book. Let him

correct his own papers. Why should we teachers waste time on such routine work? Our job should be to help

the child when he tells us that he can't find the way to get the right answer. Let the children learn what all

educated persons must some day learn, how to measure their own understanding, and how to know what they

know or do not know.

1. According to the passage, the best way for children to learn things is by _____. [ ]

A. listening to skilled people's advice

B. asking older people many questions

C. making mistakes and having them corrected

D. doing what other people do

2. Which of the following does the writer think teachers should NOT do? [ ]

A. Give children correct answers.

B. Allow children to make mistakes.

C. Point out children's mistakes to them.

D. Let children mark their own work.

3. According to the writer, teachers in school should _____. [ ]

A. allow children to learn from each other

B. point out children's mistakes whenever found

C. give children more book knowledge

D. correct children's mistakes as soon as possible

4. The passage suggests that learning to speak and learning to ride a bicycle are _____.[ ]

A. different from learning other skills

B. the same as learning skills

C. more important than other skills

D. not really important skills