Question

modern mehods to improve the yield of crops 

Answer 1

modern methods to improve the high yield of crops
more and more scientific advances are improve the high yield of crops in the agriculture.modern agriculturists have using selected crops for high yielding
Modern technology fields can be very large.by removing pests in the field.
removing the waste plants (weeds) in the fields.the weeds decreases the fertility of the soil. 

Answer 2

Use of HYV's that is High Yielding Varieties of crops may result in a good yield.And also modern farming methods like drip irrigation,efficient use of fertilizers, for protection from weeds we can use weedicides and many more simple techniques but hard to follow.Have a good day!