|Author:||Sahu, R. K. ; Rao, V. N.|
|Book Group Author:||NA|
Micro Drip Irrigation System (MDIS) is now being identified as an additional income generating technology while looking at the evolution of the market driven approach to reach small farmers. An attempt was made to design, develop and evaluate it for growing vegetables in the farmer's field in Nardha village, Durg district, Madhya Pradesh, India. The manifold and its laterals were designed and operated as a single unified system, controlled by a single valve. A water tank placed at variable heights was used to develop pressure head. A flexible 16 mm diameter pipe distributed water between the laterals of 12 mm diameter. Microtubes of 1.2 mm diameter were used as emitters. FAO's CROPWAT model was used to estimate the evapotranspiration (ET) of various vegetable crops. Irrigations were scheduled using ET values and soil characteristic data. To achieve a more realistic design, the interrelationship between Reynolds number and friction factor was incorporated by considering the effect of varying velocities of flow through various pipe sections. The hydraulic performance of the system was evaluated by measuring discharge variation among the different emitters, estimating friction head losses in different components. The correlation was developed between average discharge of emitters and pressure head. The coefficient of uniformity (CU) and emission uniformity coefficient (EU) were also estimated. The CU was found to be excellent (>95%) and EU was also found to be reasonably good (>90%). The economics of MDIS was worked out. The system cost was Rs. 78 000 ha-1. On an average the use of low cost MDIS produced 25-35% higher crop yields and saved 45-48% water, 45% of labour cost and 50% of fertilizer cost. The B:C ratio was higher in case of MDIS (5.34) as compared to basin irrigation (4.14). Thus in one season (1/3rd year) additional cost on MDIS can easily be recovered.
appropriate technology, cost benefit analysis, crop yield,design, discharge, drainage, economic analysis, emitters,evapotranspiration, irrigation equipment, irrigation scheduling,irrigation systems, microirrigation, trickle irrigation, vegetablegrowing, water requirements, water use efficiency, India, MadhyaPradesh, South Asia, Asia, Developing Countries, Commonwealth ofNations, India, intermediate technology, Agricultural Economics (EE110),Horticultural Crops (FF003) (New March 2000), Plant Water Relations(FF062), Plant Production (FF100), Soil Water Management (Irrigation andDrainage) (JJ800) (Revised June 2002) [formerly Soil Water Management],Agricultural and Forestry Equipment (General) (NN400)