Crop Production and Management

Given below is a conversation between two farmers Heera and
Beera.
Heera : Brother Beera, your maize crops looks beautiful! They
have grown pretty fast.
Beera : Yes, I have sprayed urea this time. What about you?
Heera : Well, I am still relying on good old cow dung. I am saving
money for buying a tractor.
Beera : That’s good. Tractor saves a lot of time and labour.
Heera : Yes, it’s been very labour intensive for me and now these
weeds have come up.
Beera : Try weedicides, they are very effective.
Now answer the following questions.
(i) List the practices which are not environment friendly and
why?
(ii) What is the advantage of modern agriculture implements
over traditional ones?
(iii) Name one weedicide and the precaution farmers must take
during its application.