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Technology to boost seed yield in china aster, powder puff type

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Powder-puff aster types possess  long, tubular and narrow disc florets of 1.5-2 inches length and arranged in multiple rows leading to problems of pollen viability, heterostyly and protandry resulting in poor seed set. Foliar sprays of boric acid (0.1%) twice (first spray at one month after planting and second spray after 15 days ) recorded higher seed yield of  550kg/ha.