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  • Author or Editor: Wlodzimierz Ptasznik x
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The effects of various drying conditions on seed quality and performance of matriconditioned `Bush Blue Lake 47' snap bean (Phaseolus vulgaris L.) seeds were studied. An exponential model based on the Page equation provided a good fit (R2 = 0.9) to changes in moisture content during drying. Drying matriconditioned seeds with high initial moisture content (47.2%) for 5 to 6 hours at 35C, 30% to 35% relative humidity, and 0.7 to 1.4 m·s-1 air velocity (v) retained, and in some cases augmented, the benefits derived from conditioning. Matriconditioning greatly reduced electrolyte leakage (34.3 vs. 94.7 μS·cm-1·g-1 for nontreated seeds); drying to 15% moisture content at 0.7 or 1.4 m·s-1 v moderately increased the leakage rate (59.1 to 60.9 vs. 34.3 μS·cm-1·g-1), while drying at 0.02 m·s-1 v (ambient) increased the rate to that of nontreated seeds. The leakage rate remained low (43.6 to 50.8 μS·cm-1·g-1) in matriconditioned seeds dried to 22% moisture content at all air velocities. In growth-chamber studies, rapidly drying matriconditioned seeds to 15% moisture content at 1.4 m·s-1 v improved the emergence percentage over that of nontreated seeds, increased the shoot fresh and dry weight over that of nontreated and nondried matriconditioned seeds, and increased the shoot fresh weight over that of seeds dried at 0.02 or 0.7 m·s-1 v. Drying matriconditioned seeds to 15% moisture content at 0.7 m·s-1 v improved plant fresh weight over that produced by nontreated seeds. Rapid drying to 22% moisture content at 1.4 or 0.7 m·s-1 v improved only shoot fresh weight over that of nontreated seeds. In a 1992 field planting, percent emergence of matriconditioned seeds dried at 0.7 or 1.4 m·s-1 v was similar to that of nondried matriconditioned seeds and higher than that of nontreated seeds. No significant differences were noted in plant yield among the treatments.

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Effects of preplant conditioning of supersweet corn (`GSS 3368' and `Challenger') seeds and subsequent drying on the quality and performance of seeds were studied. Matriconditioning with moist Micro-Cel E (MC) was superior to matriconditioning with moist Vermiculite #5 and Celite 400 or osmoconditioning with -1.2MPa polyethylene glycol solution at 15°C. A ld conditioning (seed: carrier: water= 5:1:7) of `GS 3368' and `Challenger' sweet corn with MC improved the seed quality, as shown by reduced electrolyte leakage; reduced the time to 50% of final emergence at 10/20°C (12/12h) in a peat-lite mix by 1 to 2d; and increased the shoot wt by 70-90%, 10 to 12d after planting. Various drying protocols were used to reduce the high water content (49% w.b.) in the ld conditioned `Challenger' seed to 14% (w.b.). At 25°C and 30% RH, conditioned seeds needed 24h to dry to 14% water content at an air flow velocity of 0.02m/s and only 7.5h at 1.4m/s. At 35°C and 30% RH, the time of drying was reduced to 16 and 5h at 0.02m/s and 1.4m/s air velocities, respectively. At 45°C and 30% RH, seeds were dried within 5h at 0.02m/s air velocity and within 3.5h at 1.4m/s. Benefits to seeds acquired through conditioning was retained maximally by drying at 35°C, 30% RH and 1.4 m/s air velocity.

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