Volume No. 7 Issue No.: 2A Page No.: 917-922 Oct. - Dec. 2012

 

CLOGGING BEHAVIOUR OF DRIPPERS OF DIFFERENT DISCHARGE RATES AS INFLUIENCED BY DIFFERENT FERTIGATION AND IRRIGATION WATER SALINITY LEVELS

 

Shinde D.G., Patel K.G., Solia B.M., Patil R.G., Lambade B.M. and Kaswala A.R.*

Department of Soil Science and Agricultural Chemistry, N.M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat (INDIA)

 

Received on : September 10, 2012

 

ABSTRACT

 

An experiment was conducted during 2008-09 at the Department of Soil Science and Agricultural Chemistry, NMCA, NAU, Navsari, India in Factorial CRD design with three replications comprising two levels of fertilizers (F0: No fertilizer and F1: 150-50-50 NPK kg/ha), four type of drippers/emitters with differential discharge rate (D1: 1.2, D2: 2, D3: 3 and D4: 4 lph) with four levels of water salinity (EC) (E1: 1.47, E2: 4, E3: 6 and E4: 8 dS/m). Fertigation with water soluble fertilizer increase the risk of clogging, particularly when fertilizer contains P, Ca, Mg, Fe and Mn. The drippers with largest discharge rate recorded less clogging. Maximum and minimum clogging was observed with higher water salinity (8 dS/m) and best available water-BAW (1.47 dS/m), respectively. Use of either lower discharge rate of dripper (1.2 lph) or higher salinity water (8 EC), clogged the dripper 15 to 30 days earlier as compared to use of higher discharge rate of dripper (4lph) or lower salinity water (1.47 EC), respectively. The co-efficient of uniformity is depends on degree of clogging. The treatments responsible for higher dripper clogging reduce the co-efficient of uniformity. The trend of results obtained in farmers survey was similar to those observed in the experiment. This confirms the findings i.e. dripper clogging is associated with dripper discharge and water salinity.

 

Keywords : Dripper, Emitter, Fertigation, Salinity, Discharge rate, Clogging percentage, Niformity co-efficient

 

 

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