Resp raju_ayer sir, Contour Trenching is a very good and deep subject. It not only controls the land slide, but also it increases the ground water column, moisture percent in the soil, not allows the top rich soil to be eroded, reduces the speed of the rain water and forces it to go into the earth gaps and there by makes the water columns raised. As of today, it should be like a mandatory to force to have contour trenches in agricultural lands by one all, villages together and taluks,dists and states lands even. There are already several taluks and dists, who have experienced the fruit of success with contour trenching and the water levels are abnormally raised considerably, by encouraging other areas farmers also to start contour trenching. Govt surveys reveals that around 20 to 30 tonnes of top soil per acre ,per year , is saved eroding, with the contour trenching. Apart from the above, contour trenching can control treepassing of certain insecticides/animals also , successfully. As a senior farmer, i advise our farming community,to provide contour trenches,in their uneven lands to restore the old and good ground water levels, put full stop to rich top soil erosion, and there by to have successful crops and good enviroment g.p.rao,farmer