Impact of deficit irrigation on citrus production under a sub-humid climate: a case study

Abstract

Water scarcity has resulted in lower yield (7–8 t ha−1) and a decline in citrus orchards in central India. In this scenario, optimal deficit irrigation (DI) is a potential option to sustain citrus production. To optimize the DI schedule in relation to yield, water productivity, fruit quality and production economics, water was applied at 30% of full irrigation (FI, 100% crop evapotranspiration), 50% of FI and 70% of FI and compared with FI in drip-irrigated citrus at Nagpur, India during 2008–2010. Fruit yield under 50% FI (11.48 t ha−1) was statistically at par with FI (13.14 t ha−1). However, a 50% reduction in water supply (1,343 m3 ha−1) resulted in a 75% improvement in water productivity in DI at 50% FI than FI (water productivity, 4.89 kg m−3). The fruit quality in DI at 50% FI (acidity, 0.83%; total soluble solids, 10.3 °Brix) was superior to FI (acidity, 0.85%; total soluble solids, 9.80 °Brix). The highest net profit (INR 94,300 ha−1) and net economic water productivity (70.19 INR m−3) were generated under DI at 50% FI. The study inferred that irrigation at 50% FI could be a water-saving and profitable option for citrus production in central India. HIGHLIGHTS Optimal water stress under deficit irrigation (DI) improved fruit quality significantly.; DI improved net economic return with half of the water used under full irrigation in citrus cultivation.; Higher fruit weight was observed due to less number of fruits in DI.; Water productivity and net economic water productivity were enhanced by 75% and 118%, respectively, in DI compared with FI.;

Keywords

• limited water
• microirrigation
• nagpur mandarin
• net income
• tropical region