Abstract— Application of growth regulators and induction of water stress at different growth stages is known to improve yield in many of the fruit crops. An experiment was carried out at Horticultural College and Research Institute, Periyakulam during the year 2006-2008 on five year old trees of acid lime cv. PKM 1 in the main and off seasons of a year. The trees were subjected to soil water stress conditions at two levels (30 days and 45 days) along with spraying of growth regulators viz., (CCC 500 ppm, ascorbic acid 50 ppm and gibberellic acid (GA3)10 ppm. Soil water stress was taken as one factor and growth regulator was another executed following factorial randomized block design. In general, nitrogen content of leaves was more in main season than off season. Three way interaction between stress, growth regulators and stages of tree growth revealed that the combination S1C2L1 (water stress for 30 days + foliar spraying of ascorbic acid 50 ppm concentration at vegetative stage) registered the highest nitrogen content (2.97 and 2.92 per cent) in the main season of the year 2006 – 07 and 2007 – 08. The phosphorus and potassium content of leaves of acid lime also found significant irrespective of seasons. The combination S1C2 (30 days water stress along with foliar application of ascorbic acid 50 ppm concentration) recorded the highest phosphorus content in the main (0.19 and 0.18 per cent) and off (0.19 and 0.16 per cent) season during the year 2007 – 08 and 2006 – 07 respectively. The interaction between stress, growth regulators and stages of tree growth showed that the combination S1C2L1 recorded the highest potassium content (2.37 and 2.35 per cent) in the main and off season of the year 2006 – 07 and 2007 – 08. It was followed in the combinations S2C3L1 (2.30 and 2.27 per cent) and S1C1L1 (2.13 and 2.12 per cent) in the year 2006 – 07 and 2007 – 08 respectively.
Keywords— Acid lime, water stress, growth regulators and nutrient uptake.
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