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5.4. Complete the sentences with the words given below:

1. The common problem with furrow and border strip irrigation is ... caused by uneven flow rates. This problem can be solved by ... and ... .

2. Hard water, improper filtration etc. may cause … of emitters. Plugging can be reduced by … .

3. If you replace a bad emitter with the one of the same model and carefully match it with the equipment, you can avoid the problem of … .

4. In microsprayer, drip and sprinkler systems one can often encounter … problems. You can detect them in … , … … or … … .

(flushing and chemical treatment, variable set times, filtration devices, plugging, within the delivery system, multiple emitter sizes, lazer leveling, deep tillage, the pump, pressure).

5.5. Divide the text into parts, state the microtopics of each part and express the contents of each part in one or two sentences.

5.6. Write a summary of Text b in English. Test 12

I. Choose the one word or phrase that best completes the sentence:

1. The Irrigation Review program … in California in 1993.

a) begins; c) is begun;

b) was begun; d) have been begun.

2. We … irrigation review for many systems lately.

a) are performed; c) have performed;

b) perform; d) has been performing.

3. Pressure losses greater than 5 psi … excessive.

a) are considered; c) considers;

b) is considered; d) have considered.

4. Individual emitters usually … with specialized cleaning tools.

a) is cleaned; c) are cleaning;

b) are cleaned; d) were being cleaned.

5. Sprinkler systems … not only to water crops but also for fertilizer applications, frost protection, pest and disease control.

a) are being used; c) used;

b) use; d) are used.

II. Identify the one underlined word or phrase that must be changed in order for the sentence to be correct:

1. The methods of irrigation is dependent on individual land features,

A B

the crops to be irrigated, the nature of water supply and the ability of soil

C

to absorb and hold water.

D

2. The object of border strip irrigation is to advance a sheet of water

A B

down a narrow strip between low borders and to getting the water into the

C

soil as the sheet advances.

D

3. In the course of time both irrigation machinery and irrigation

A

techniques has been greatly improved.

B C D

4. In surface irrigation water is convey to the point of infiltration on the

A B C D

soil surface.

5. The method of sprinkler irrigation, when the water falls on the land

A

surface in a uniform pattern, came into widespread use because it could

B

be adapt to most sites and crops.

C D

6. Every year the graduates from our University meet with the teaching

A B C

staff and tuitors in spring.

D

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