Intercultural Equipment Questions and Answers

Answer: B

The approximate weeding efficiency is 80-85%.

The gender friendly (women friendly) rice weeder is a light, hand-pushed rotary weeder designed for wetland rice sown or transplanted in rows. Its rotor cuts and uproots the weeds between the rows and presses them into the puddled soil, so the three actions in the stem (cutting, uprooting and incorporation) happen in one pass. Field trials on a weeder of this type, for example one reported from IGKVV Raipur, gave plot readings of 78 to 86 percent with a mean near 82 percent, which sits inside the keyed range.

The other ranges are lower (50-55%, 60-65%, 70-75%). Mechanical weeders in rows leave the weeds that grow within the hill uncut, so efficiency never reaches 100 percent, but a well-set rotary weeder removes the large majority of inter-row weeds, which is why the upper-middle range fits better than the lower ones.

Answer: D

The one that is not tractor drawn is the Dutch hoe.

A Dutch hoe is a manual weeding tool: a flat blade on a long handle that is pushed and pulled just below the soil surface to cut weeds. It is operated by hand, not drawn by a tractor.

Lister cultivators, rotary weeders and rod weeders are all tractor-drawn row-crop cultivation implements, used for weeding and stirring the soil between rows or for working listed (ridged) land.

Answer: A

The burners are mounted at 30°-45° to the horizontal.

A flame weeder directs a hot LPG flame at the weeds, which are killed by heat that ruptures their cells rather than by burning them to ash. Mounting the burners at an angle of about 30 to 45 degrees with the horizontal points the blue, hottest part of the flame at the ground and the weeds near the plant base, while keeping it from rising onto the crop canopy.

Angles of 10 to 20 degrees lay the flame almost flat and spread it too thinly, while 60 to 80 degrees points it almost straight down into the soil, so the paper's range in between is the working setting.