|Author:||Kadam, U. S. ; Gorantiwar, S. D. ; Kadam, S. A. ; Gurav,G. B. ; Patil, H. M.|
|Book Group Author:||NA|
A field experiment was conducted at the Instructional Farm and Drainage Engineering, Dr. A.S. College of Agricultural Engineering, Rahuri, Maharashtra, India, during December 2001 to April 2002, to determine the effect of different soil water regimes on yield potential of onion by using micro-sprinkler irrigation system. The experiment was laid out with five treatments (T1, T2, T3, T4, corresponding to 20, 30, 40 and 50% of moisture depletion level, compared with conventional irrigation method). The micro-sprinklers spaced at 1.75×1.75 m from all the treatment plots were operated simultaneously at 1 kg/cm2 operating pressure. The water applied for 20% moisture depletion level was 514 mm and decreased to 446 mm as the depletion level increased to 50%. The total depth of water applied in surface irrigation method was 600 mm. The irrigation application by micro-sprinkler at 50% depletion was closer to surface irrigation in terms of scheduling. Though moisture depletion in treatment T4 and control was somewhat closer, the total depth of water applied in treatment 446 mm, was less than that of control (600 mm) which indicated that micro-sprinkler could save the water. The moisture depletion from the root zone for each of the treatments revealed that the average soil moisture depletion over available soil water were 20.08, 29.97, 39.99, 50.00 and 46.57% in treatments T1, T2, T3, T4 and T5, respectively. The yield of onion was maximum (494 q/ha) in treatment with 20% depletion level and was significantly superior over all other treatments. Treatment with 50% depletion level recorded the lowest yield of bulbs (221 q/ha). The increase in the yield of onion over control was observed as 98.0, 45.4 and 19.4% in treatments T1, T2 and T3, respectively. The water use efficiency (WUE) was maximum (961.8 kg/ha cm) in treatment T1 and decreased with the increase in percent moisture depletion levels. The WUE was minimum (416 kg/ha cm) in control treatment T5 than any other treatments. The percent savings in water were observed to be 14.33, 16.26, 22.05 and 25.60 in treatments T1, T2, T3 and T4, respectively, over the control treatment.
|Pages:||342 - 345|
|Journal:||Journal of Maharashtra Agricultural Universities|
crop yield, irrigation, irrigation requirements, irrigationscheduling, irrigation systems, onions, soil water content, soil waterregimes, sprinkler irrigation, surface irrigation, water requirements,water use efficiency, India, Maharashtra, Allium, Allium cepa, Allium,Alliaceae, Liliaceae, Liliales, monocotyledons, angiosperms,Spermatophyta, plants, eukaryotes, South Asia, Asia, DevelopingCountries, Commonwealth of Nations, India, spray irrigation, watering,Horticultural Crops (FF003) (New March 2000), Plant Water Relations(FF062), Plant Production (FF100), Soil Physics (JJ300), Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management], Agricultural and Forestry Equipment(General) (NN400)