Water productivity, economics and energetics of gobhi sarson (Brassica napus L.) as influenced by drip irrigation and fertigation schedules
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation entitled “Water productivity, economics and energetics of gobhi sarson (Brassica napus L.) as influenced by drip irrigation and fertigation schedules” was conducted to find out water and energy efficient drip irrigation and fertigation schedules to increase the productivity and profitability of gobhi sarson (Brassica napus L.). The experiment was conducted at the Student’s Research Farm, Department of Agronomy, Punjab Agricultural University, Ludhiana, during the rabi seasons of 2016-17 and 2017-18. It was laid out in randomized complete block design (RCBD) comprising combinations of three drip irrigation levels (60% of CPE, 80% of CPE and 100% of CPE) and three fertigation levels (60% RDF, 80% RDF and 100% RDF) along with one absolute control (flood irrigation and manual application of recommended dose of nutrients). Drip irrigation at 100% of CPE recorded highest values for growth parameters and yield attributes which were statistically at par with 80% of CPE but significantly higher than 60% of CPE during both the crop seasons. Drip irrigation with 100% of CPE recorded 19.5%, 16.1% and 23.1%, 20.3% higher seed and oil yield than 60% of CPE during 2016-17 and 2017-18, respectively whereas 80% of CPE recorded 15.5%, 13.0% and 19.0%, 17.5% higher seed and oil yield than 60% of CPE during 2016-17 and 2017-18, respectively. Highest gross returns, net returns, B:C, energy use efficiency and energy productivity were also obtained with drip irrigation at 100% of CPE followed by 80% of CPE. However, apparent and total water productivity obtained was lowest in 100% of CPE and highest in 80% of CPE resulting in saving of 12.7% and 14.5% irrigation water as compared to 100% of CPE during 2016-17 and 2017-18, respectively. Fertigation schedules at 100% RDF recorded highest growth parameters, oil and seed yield which were statistically at par with 80% RDF but significantly higher than 60% RDF. However, an inverse relationship between increased fertilizer doses and oil content was observed. Fertigation at 100% RDF resulted in maximum gross (76445 and 94310 Rs ha-1) and net returns (39851 and 57769 Rs ha-1) followed by 80% RDF and 60% RDF although, B:C was highest in 80% RDF (1.15 and 1.65) as compared to 100% RDF (1.09 and 1.58) during 2016-17 and 2017-18, respectively. Maximum energy use efficiency and energy productivity was obtained with fertigation at 60% RDF followed by 80% RDF. Drip irrigation at 100% of CPE or 80% of CPE with 100% RDF or 80% RDF produced significantly higher seed and oil yield, economics, water productivity and energetics as compared to absolute control. Hence, gobhi sarson should be irrigated through drip irrigation at 80% of CPE with 80% RDF to obtain higher net returns, water productivity and energy productivity than absolute control.
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