26. What are weeds? Give two examples. Describe any one method other than manual, by harrow or by plough, can be used for removing weeds?
Answers
Explanation:
Weeds are unwanted plants in the cultivated field. e.g., Xanthium, Parthenium, chmicus rotundus. Weeds take up nutrients and reduce the growth of the crop. Therefore their removal is necessary.In agriculture, a harrow (often called a set of harrows in a plurale tantum sense) is an implement for breaking up and smoothing out the surface of the soil. In this way it is distinct in its effect from the plough, which is used for deeper tillage. Harrowing is often carried out on fields to follow the rough finish left by plowing operations. The purpose of this harrowing is generally to break up clods (lumps of soil) and to provide a finer finish, a good tilth or soil structure that is suitable for seedbed use. Coarser harrowing may also be used to remove weeds and to cover seed after sowing. Harrows differ from cultivators in that they disturb the whole surface of the soil, such as to prepare a seedbed, instead of disturbing only narrow trails that skirt crop rows (to kill weeds).
Explanation:
Weeds are unwanted and uncultivated plants that grow with crops and compete with crops for nutrients and can also cause crop toxification. Weeding is removal of weeds and is mostly done before flowering begins in crop plants. It is done using trowel, harrow or weedicides. Trowel is used in manual removal of weeds. Ploughing/tilling of soil, before seed sowing, using plough or cultivar followed by breaking the left over soil crumps using leveller also removes the weeds. Similarly, use of weedicides, the chemicals that control the growth of weeds, is also practised.