Reclamation of calcareous soil (IGKV RAIPUR C.G)

Reclamation of calcareous soil (IGKV RAIPUR C.G)

1. Reclamation of calcareous soil

2. Reclamations :- Cultural reclamation Water management Chemical reclamation Biological reclamation 1.Cultural reclamation:- Tillage operation :- Light calcareous soil develops large number of pore spaces due to flocculation. These type of soils have poor water holding capacity. Therefore such type of soil needs compaction by plank or roller to increase the water holding capacity.

3. 2 . Mulching :- In the initial year when the concentration of soluble salts is high in the surface soil layers, mulching can considerably help leach soluble salts reduce ESP and obtain higher yield of tolerant crops. 3 :- Continuous cropping:- Fallowing encourages upward movement of salts. Improves the soil, reduce ESP with time to a gradually increasing depth.

4. 2. Water management:- Drainage :- Collection of part of the rainfall in the cropland to a depth that will not be harmful to the crop. Field studies have sown that up to 15 cm. of storm rainfall could be stored within the bunded fields without the affecting rice yields adversely.

5. 3. Biological reclamation Application of organic manure :- Organic matter decomposition and plant root action also help dissolve the calcium compounds found in most soils, thus promoting reclamation but this is relatively a slow process. 4. Chemical reclamation:- Use of chemical fertilizer :- Availability of phosphorus is low in calcareous soil. To increase the availability of P the phosphatic fertilizer should be used in the following manner:

6. To increase the availability of P the phosphatic fertilizer should be used in the following manner: Phosphatic fertilizer should be used near the roots of plant. U se of phosphatic fertilizer in ball form also increases its availability. Some amendments react in the soil :- Gypsum :- Gypsum is a white mineral that occure extensively in natural deposite. G ypsum is soluble in water to the extent of about ¼ of 1% and is therefore a direct source of soluble calcium.

7. 2. Calcium chloride :- It is a highly soluble salt which supply soluble calcium directly. Its reactions in sodic soil are similar to those of gypsum. 3 . Sulphuric acid :- It is an oily corrosive liquid and is usually about 95% pure. Upon application to soils containing calcium carbonate it immediately reacts to form calcium sulphate & thus provides soluble calcium indirectly.

8. 4. Iron sulphate :- I t is solid granular materials usually have a high degree of purity and are soluble in water. When applied to soils these compounds dissolve in soil water and hydrolyse to form sulphuric acid.

9. INDIRA GANDHI KRISHI VISHWAVIDYALAYA, RAIPUR