What are the primary considerations in chemical control of unwanted plants?

What will be an ideal response?


Proper kind of herbicide, proper rate of herbicide, proper volume of herbicide, proper time of control, proper method of chemical control.

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Follow the steps of the Systematic Approach of Section 14.4—that is, (1) identify the system, (2) determine whether the process is batch or rate, (3) construct a schematic diagram with inputs and outputs, (4) Label known material quantities or rates of flow and so on. A solution of potassium chromate (K2CrO4) is to be used to produce K2CrO4 crystals using an evaporator and crystallizer/filter. A 38 percent solution is fed to the evaporator. The stream leaving the evaporator is 48 percent K2CrO4 and is fed to the crystallizer/ filter. Pure K2CrO4 crystals are produced and the remaining solution is 44 percent K2CrO4. This solution is cycled back to the evaporator. If 1.2 t/h of pure crystals are needed, calculate the total input to the evaporator, the feed rate to the

crystallizer/filter, and the water removed from the evaporator. What will be an ideal response?

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The _____ fence gives better snow protection

a. semisolid c. chain-linked b. solid d. barbed wire

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The three terms used to describe soil salinity are ____________________, ____________________, and ____________________

Fill in the blank(s) with correct word

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The place on a print where a revision was made may be indicated by a letter or number enclosed in a circle or triangle.

Answer the following statement true (T) or false (F)

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