EFFECTS OF DIFFERENT AGED SEEDLINGS AND TRANSPLANTING DATES ON THE GROWTH, YIELD AND NUTRIENT CONTENTS OF LATE AMAN RICE CULTIVARS

Abstract

The field experiment was conducted to study the effect of 4 transplanting dates (15. 22. 29 September and 06 October) and 4 different aged seedlings (4. 5. 6 and 7 weeks aged seedlings) on the growth, yield and nutrient content of two late T. Aman rice Bina-sail and 8R22 cultivars during July to December, 2013- The two factorial experiment was laid out in a RCBD design with three replications. The cultivars BR22 and Bina-sail showed non-significant variation in case of growth and yield parameters at different aged seedlings and transplanted dates except plant height. panicle length and filled grain panicle", where Bina-sail gave significantly higher results than BR22. In case of N. P and K contents in shoot and 1000-grain weight & grain yield. BR22 eultivar gave significantly higher results than Bina-sail. Different aged seedlings and transplanting dates had significant effects on growth & yield parameters and also on N. P and K contents in shoot of late T. Aman rice except total tillers panicle length and spikelets panicle". The highest plant height, effective tillers hill', panicle length. spikelet and filled grain number panicle4, 1000-grain weight and grain yield were found in 4 weeks aged seedlings transplanted on 15 September. On the other hand, 7 weeks aged seedlings transplanted on 06 October showed the lowest results in all cases except non-effective tillers hill" and unfilled grains panicle" where the highest results were recorded in 7 weeks aged seedlings transplanted on 06 October and the lowest values were found in 4 weeks aged seedlings transplanted on IS September. N. P and K contents in shoots of late 1. Aman rice significantly decreased in old seedlings with later dates of transplantation in case of both 13R22 and Bina-sail cultivars. The plant height. filled and unfilled grains panicle", 1000-grain weight and grain yield differed significantly due to the interaction effect of different aged seedlings and planting dates of late T. anian rice cultivars. The highest plant height and filled grains panicle" were obtained from Binasail which was planted on 15 September with 4 weeks old seedlings except unfilled grain panicle' where it was the lowest result. But the highest grain yield and 1000-grain weight were found in 8R22 transplanted on 15 September with 4 weeks old seedlings.