National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present study aimed to determine irrigation depth and interval based on soil water potential fluctuation monitoring for Brinjal. Field experiment was conducted at Agricultural Engineering College and Research Institute, Kumulur, Tamil Nadu during the two crop growing seasons from 13 November 2018 to 22 March 2019 and 13 April 2019 to 20 August 2019. Brinjal F1 hybrid Dhruva was transplanted at the row spacing of 90 cm and plant spacing was 45 cm. For drip irrigation system inline laterals were laid at the spacing of 90 cm with dripper spacing of 45 cm and dripper discharge of 4 lph. To assess the right time of irrigation, soil matric potential was measured by tensiometers installed at the maximum rooting intensity (10 cm) and rooting depth of crop. The soil matric potential was observed at three times in a day 8 am, 2 pm and 5 pm. Irrigation was given when the soil matric potential reached 15 to 20 kPa. Actual ETc was estimated using soil water balance method and reference evapotranspiration ET was used to estimate crop coefficient values for different crop growing stages. The ETo calculator was used to calculate the reference evapotranspiration from the 25 years meteorological date and the 25 years average reference evapotranspiration were taken for this study. From this study irrigation interval was decided based on soil matric potential threshold values, it was found as 1 to 2 days. Computed Kc values at initial, development, mid and end stage of the brinjal for I crop period was 0.57, 0.83, 1.03, 0.84 and for II crop period was 0.59, 0.84, 1.02, 0.82. Field test verification of crop water requirement for drip irrigated brinjal by soil water balance method shows that Food & Agricultural Organization (FAO) method can be used by farmers to irrigate the crops.
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