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Studies on the use of plant growth retardants in the seed production of italian rye grass lolium multiflorum 1. the effect of chlormequat daminozide ancymidol and dikegulac



Studies on the use of plant growth retardants in the seed production of italian rye grass lolium multiflorum 1. the effect of chlormequat daminozide ancymidol and dikegulac



Grassland Science 26(3): 267-272



To assess the use of plant growth retardants for seed production of Italian ryegrass, 4 chemicals including chlormequat (CCC), daminozide (SADH), ancymidol and dikegulac, were applied at 2 growth stages (early, stage 5 of the Feekes-Large scale for cereals; and late, stage 6-7) with low and high levels. Significant growth reduction of plant height was obtained with dikegulac only. Number of ears was increased with early applications of CCC and with high levels of dikegulac. Higher seed weight and seed number per ear were produced with early applications of CCC, and with all treatments of ancymidol. High levels of dikegulac greatly reduced both characters. Number of spikelets per ear and 1000-seed weight were reduced considerably by the early and the late applications of dikegulac, respectively. The effect of growth retardants on the number of seeds per spikelet was the same as the number of seeds per ear. Growth retardants affected seed yield through the effects on seed yield components. Seed yield was increased with early applications of CCC and ancymidol, and was decreased greatly by all treatments of dikegulac. The marked effect of SADH was not recognized on the seed yield and seed yield components.

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