Green and blue water footprint for groundnut (Arachis hypogaea L.) under irrigation scheduling and nutrient management practices

Water shortage is a key obstacle to the sustainable supply of food to the world and Indian population, since largest consumptive water use. This research paper determines he water footprint of green and blue water for groundnut under an irrigated conditions during different seasons.

The field experiments were conducted at Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai, Tamil Nadu during summer, kharif and rabi 2016-2018. The experiments were laid out in a split-plot design with three replications. The main plot consisted of three levels of irrigation scheduling namely 0.8, 0.6 and 0.4 IW/CPE ratios and sub-plots comprised of four nutrient management practices viz., 75% of RDF with 5 tones/ha of charred rice husk, 50% of RDF with 5 tones/ha of charred rice husk, 75% of RDF with 5 tones/ha of charred rice husk along with seed treatment of Arbuscular mycorrhiza and 50% of RDF with 5 tones/ha of charred rice husk along with seed treatment Arbuscular mycorrhiza.

The study revealed that the growth attributes, pod yield and haulm yield, rain and irrigation water content and water use studies of groundnut were registered higher with irrigation scheduling at 0.8 IW/CPE ratios along with the application of 75% RDF and 5 tones/ha of charred rice husk as basal with seed treatment of Arbuscular mycorrhiza. The higher green water content has been recorded with irrigation scheduling at 0.6 and 0.4 IW/CPE ratios during summer’ and kharif’ 2017. The higher blue water content was recorded under irrigation scheduling at 0.8 IW/CPE ratios during all three seasons.