Brassica juncea is a self-incompatible crop due to which flowers cannot utilize their own pollen which needs biological agents like different insect groups for transfer of the pollen from male flowers to female flowers

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Field experiments were conducted during kharif 2014 and 2015 to study the effect of age and number of seedling per hill on growth and yield of black scented rice (Oryza sativa L.) variety "Chakhao Poireiton' under Manipur condition to find out the suitable age of seedling and number of seedling per hill. The experiment consists of four seedling age viz., A 1 -15 days old seedling; A 2 -25 days old seedling; A 3 -35 days old seedling; A 4 -45 days old seedling and four number of seedlings per hill viz., S 1 -1 seedling/hill; S 2 -2 seedling/hill; S 3 -3 seedling/hill; S 4 -4 seedling/hill. The highest plant height (193.67 cm) was recorded from the transplanting of 15 day old seedling and decreases with the increase in seedling age. Transplanting of 15 day old seedling produced maximum yield attributes like numbers of effective tillers per hill (11.00), length of panicle (25.73 cm), grain yield (1946 kg/ha) and straw yield (3473 kg/ha). Among the different number of seedling/hill, maximum plant height (197.28 cm) was observed from the transplanting of 4 seedlings/hill followed by 2 seedling/hill (193.47 cm). As the maximum length of panicle (24.99 cm) was observed in 1 seedling /hill thus showed superiority over the rest of the number of seedling per hill. The highest grain yield (1719 kg/ha) recorded in the S 3 (3 seedlings per hill) was also significantly higher than the other treatments and the lowest grain yield (1346 kg/ha) in S 1 (1 seedling per hill). Highest gross return (Rs 1,08,945/ha), net return (Rs 69,536/ha) and B:C ratio (1.76) were obtained from the treatment A 1 S 2 (transplanting of 15 days old seedling with 2 seedlings/hill). The total anthocyanin content in Chakhao Poireiton was found to be in the range of 599 to 724 mg/kg cyaniding 3-glucoside/kg of powdered rice. The anthocyanin content decreases as the increase in seedling age.

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