Short notes on: (a) Bush burning: (i)Nitrogen is lost to the atmosphere in form of gas during bush burning. (ii) Also, sulphur is lost during bush burning in form of gas. (iii) Burning of lifter exposes the soil surface to rain force an risk of surface erosion. (iv) It also destroys useful soil organisms i.e farm animals and crops. (v) can be used I stimulate vegetative growth in pastures. (vi) Soil is enriched by potassium and phosphate. (vii) It breaks cycle ( pests and disease organisms i.e sterilization of soil. (viii) It leads to loss of organic matter in soil (ix) It kills wee seeds. (x) It reduces soil water content. (xi) It destroys soil structure. (xii) It affects soil pH. (xiii) It also leads environmental pollution.
(b) Clean clearing: (i) It exposes soil surface, thus facilitating the rate of leaching of soil nutrients e.g. sandy soil. (ii) It leads to excessive heating of the soil (iii) It exposes the soil to erosion by wind and water. (iv) It results in lower productivity. (v) It also exposes land to rapid evaporation of soil moisture. (vi) It facilitate the use of tillage implements or equipment or farm machinery. (vii) upsets the ecosystem (ecological balance).
(c) Organic manuring: (i) may be compost FYM and Green manure. (ii) is the application of plant and animal remains to the soil. (iii) enhances build up of soil organisms. (iv) improves soil structure. (v) stabilize soil pH (buffer) (I, reduces leaching of nutrients. (vii) improves aeration and percolation. (viii) increases water retention of soil (i) moderates and regulates soil temperature. (x) increases the C.E.C. (cation exchange capacity) of the soil. (xi) has longer effect as source of soil nutrient, than inorganic fertilizers.