Effect of irrigation regimes on growth, flowering and biochemical changes in ber plants
2009
Sidhu, A. S. | Bal, J. S.
The present investigation was conducted at New Orchard, Punjab Agricultural University ( PAU), on loamy sand soil during the cropping seasons of 2003-04 and 2004-05 based on fixed irrigation water to class A pan ratio (IW/Pan E ratio) of cumulative pan evaporation (CPE) of 50 mm, 75 mm, 100 mm, 125 mm and 150 mm. The frequently irrigating plants of CPE 50 mm excelled in canopy volume, scion/stock girth and leaf area as compared to stressed plants of CPE 125 mm and CPE 150 mm. The mild to moderate stress plants of CPE 75 and CPE 100 mm attained linear increase in canopy volume and leaf area. The plants irrigated under stress conditions of CPE 150 mm were first to flower, attain full bloom and first to complete flowering phase. Maximum fruit set (13.7%) in first year and 11.7 per cent in the second year was attained in plants irrigated at 75 mm. The imbalanced source-sink activity, failure of phloem unloading and high soil moisture stress accumulated significantly higher concentration of proline, showed high C: N ratio but had low protein content in stressed plants irrigated at CPE 150 mm. The best irrigation schedule for young ber plants was identified at CPE 75 mm and eleven irrigations were suggested for initial establishment and better production.
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