Volume No. 6 Issue No.: 4 Page No.: 988-993 April-June 2012
EFFECT OF SALINITY, PHASIC SALINITY STRESS AND MULCHING ON YIELD OF BRINJAL AS WELL AS SOIL PROPERTIES
A.R. Kaswala*, Patil R.G., Patel K.G., Patel A.M., Sabalpara A.N. and Patel R.V.
Soil and Water Management Research Unit, Navsari Agricultural University, Navsari, Gujarat (India)
Received on : March 05,2012
A field experiment was conducted during rabi- 2000 at Navsari Agricultural University, Navsari Gujarat, (India) for evaluating the effect of different irrigation water salinity (4 and 8 dS/m), stress imposed at different growth phases (15, 30 and 45 DAT) in presence and absence of mulch (no mulch, trash mulch and black plastic mulch) on yield as well as soil properties after harvest of brinjal crop. These treatments were also compared with best available irrigation water (BAW) as control. Fruit yield of brinjal was increased (22.2 %) with 4 dS/m over 8 dS/m of irrigation water salinity but, it was 5 per cent higher when compared to BAW (40.1 t/ha). The salinity stress imposed at an early stage significantly reduced the yield. While mulching either with trash or black plastic had significant positive effect on fruit yield of brinjal. The values of water stable aggregate (WSA) and saturated hydraulic conductivity (HC) were always higher under lower level of salinity but progressive increase in salt content was more with higher level of saline water. Apart from physical and chemical properties, decrease in microbial population was also registered at higher level of water salinity. Delaying imposition of salinity stress improved the WSA, HC, availability of some nutrients and also favorably influenced the bacterial and fungal population. Mulching with trash improved WSA, HC and microbial population in soil. Among the mulches, unmulched control recorded significantly higher EC value after harvest of the crop. Nutrients availability was also enhanced with mulching treatments.
Keywords : Soil salinity, Phasic stress, Mulching, WAS, HC, EC, Microbial population