Soil moisture conservation techniques
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This document discusses various in-situ soil moisture conservation techniques. It introduces the topic and explains that these techniques are recommended in addition to large-scale watershed management structures to increase moisture availability for crops. The techniques aim to increase infiltration and temporarily store water at the soil surface. The document then describes several specific techniques in detail, including deep tillage, mulching, basin listing, broad-based beds and furrows, ridges and furrows, and compartmental bunding. It explains the principles and benefits of each technique for conserving soil moisture.
Soil moisture conservation techniques
- 1. SOIL MOISTURE CONSERVATION TECHNIQUES Submitted by, MANU MOHAN BSc (Agri) I SEM.
- 2. INTRODUCTION To increase the moisture availability to the agricultural crops, it is necessary to adopt in-situ moisture conservation techniques in addition to the large scale soil and moisture conservation and water harvesting structures in the watershed.
- 3. The principle behind the recommendation of different practices is to increase the infiltration by reducing the rate of runoff, temporarily Impounding the water on the surface of the soil to increase the opportunity time for infiltration and modifying the land configuration for inter plot water harvesting.
- 4. Earlier efforts for moisture conservation were concentrated upon construction of various types of bunds across the land slope to control erosion and conserve soil. All the erosion control measures however, led to accumulation of water against the structures rather than its proper and uniform distribution in the interterraced area and at times led to reduction in crop yields.
- 5. To overcome these problems the insitu moisture conservation techniques are recommended. Generally, the sub soiling and deep digging decreases the soil penetration resistance and increases profile water use when compared with conventional tillage.
- 6. In-situ moisture conservation methods To increase the moisture availability to the agricultural crops in the individual farmer’s field and to increase the infiltration and percolation of rain water into the root profile, the in-situ moisture conservation techniques are recommended.
- 7. i) Deep tillage: Deep tillage means performing tillage operations below the normal tillage depth to modify the physical or chemical properties of a soil. It includes tillage operations commonly referred to as deep plowing, subsoiling, ripping, or row-till, which are carried out on an as-needed basis.
- 8. ii) Mulching: Mulching is one of the simplest methods to conserve soil moisture.A Mulch is simply a proyective layer of a material that is spread on top of a soil.Mulches can either be organic- such as straw bark chips etc.or inorganic like stones brick chips plastic. The process is used both in commercial crop production and in gardening, and when applied correctly can dramatically improve soil productivity.
- 9. Advantages of mulching Protects from soil erosion Reduces compaction from the impact of heavy rains Prevents weed growth Maintains a more even soil temperature.
- 10. iii) Basin listing: in this method of soil and water conservations basins are constructed using a special implement called basin lister.These basin are constructed across the slope. Basin listing provides maximum time to rain water for infiltration into soil
- 12. iv) Broad based bed and furrows: This system helps the soil to preserve the water level for a longer period. Holding the moisture intact, the bed stimulates crops growth. This system not only help in water conservation but also help to adopt to changing climate.
- 14. v) Ridges and furrows: It is an archeological pattern of ridges and troughs created by a system of ploughing used in Europe during the middle age, typical of the open field system.
- 16. vi) Compartmental bunding: It means the entire field is divided into small compartments with pre determined size to retain the rain water where it falls and arrest soil erosion. The compartmental bunds are formed using bund former. The size of the bunds depends upon the slope of the land compartmental bunds provide more opportunity time for water to infiltrate into the soil and help in conserving soil moisture.
- 17. Advantages of compartmental bunding Conserves moisture Suitable for lesser rainfall areas Reduces the formation of cracks It can be formed while ploughing itself or before early sowing.
- 18. THANK YOU