Why should preventive measures
and biological control methods be
preferred for protecting crops?
Which of the following conditions
will give the most benefits? Why?
(a) Farmers use high-quality
seeds, do not adopt
irrigation or use fertilizers.
(b) Farmers use ordinary
seeds, adopt irrigation and
use fertilizer.
(c) Farmers use quality seeds,
adopt irrigation, use
fertilizer and use crop
protection measures.
Compare the use of manure and fertilizers in maintaining soil fertility.
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