Management of Lodging in Dicoccum Wheat Using Plant Growth Regulators
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Date
2017-05
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University of Agricultural Science, Dharwad
Abstract
Two field experiments were conducted during rabi season of 2009 and 2010 in deep vertisol at Agricultural Research Station, Madurakhandi of Jamakhandi taluka, Bagalkot district, UAS, Dharwad. In the first experiment it was aimed to induce lodging tolerance using growth regulators to enhance yield in dicoccum wheat varieties (DDK-1029 and Mudhol local) in a factorial design with three replications. In the second experiment, it was planned to identify a critical crop growth stage susceptible to artificial lodging leading to yield loss and yield structure modification in dicoccum wheat variety Mudhol local in a split plot design with main plot having degrees of artificial lodging (450 and 900) at four feekes stages (FS 10.3, 10.52, 11.3 and 11.2) and a control. Treatment combinations were replicated thrice. In the first experiment, the growth regulator ethephon @ 30 ppm significantly increased the grain yield (2,700 kg ha-1) compared to control (1,910 kg ha-1) by significantly reducing the plant height (70.3 cm), stem length (60.60 cm), but, recorded higher number of productive tillers (390 m2), test weight (37.8 g) and harvest index (42.3 %). The interaction of growth regulator and genotypes showed that, use of ethephon at 30 ppm recorded significantly higher grain yield (2,780 kg ha-1), straw yield (3.96 t ha-1), panicle weight (92.0 g plant-1) and harvest index (47.5%) in DDK-1029 than Mudhol local. In the second experiment, between degrees of artificial lodging, 450 recorded significantly higher grain yield (1,987 kg ha-1) compared to 900 (1,796 kg ha-1). Among stages, artificial lodging at mealy ripe stage gave significantly lower grain yield of 1,681 kg ha-1 compared to before heading stage (2,201 kg ha-1) and conventional practice (2,082 kg ha-1). The interactions between degrees and stages of artificial lodging showed that the grain yield with 450 compared to 900 was significantly higher at before heading (2385 kg ha-1), but, it was on par with conventional treatment (2,082 kg ha-1).