Tajuddin, EThankappan, GKAU2020-02-112020-02-111986http://krishikosh.egranth.ac.in/handle/1/5810142883PGWith a view to identify suitable planting techniques for medium duration rice in Mundakan season, an experiment was conducted at the Cropping Systems Research Centre, Karamana, Trivandrum during 1984-85. The experiment was laid out in split plot design. In the main plot there were six treatments formed by the combinations of three spacings {20 x 15 cm, 20 x 10 cm and 15 x 10 cm) and two age of seedling (20 day old and 35 day old) ° In the sub plot there were six treatments formed by the combinations of two depth of planting ( 3 to 4 era and 6 to 8 cm) and three seedling rates per hill ( 3, 6 and 9 seedlings per hill).In total there were 36 treatment combinations. The Variety used was Jaya. The abstract of results are given below. Tiller production and leaf production per hill was highest with the wider spacing (20 x 15 cm) while LAI was more with the closer spacing (15 x 10 cm). Plant height was not affected due to plant spacing. Crop raised by planting 20 day old seedlings produced more plant height at harvest, more tillers at 40 DAT, and more leaves and LAI at 60 DAT, compared to the one raised by aged seedlings ( 35 day old). Shallow planting resulted more plant height, number of tillers per hill, number of leaves per hill, and LAI and this effect was seen only at 40 DAT. Crop raised by planting nine seedlings per hill produced more number of tillers and leaves per hill. LAI was not affected due to difference in seedling rate per hill. The interaction effects between treatment factors on growth characters such as plant height, tiller number per hill,leaf number per hill and LAI were not pronounced. The main effects of spacing seedling age# planting depth and seedling number per hill and the interaction between the treatment factors on the uptake of N# P and K can be treated as absent. Wider spacing (20 x 15 cm) resulted more number of filled grains per panicle and percentage filled grains. Crop raised by planting 35 day old seedlings produced highest percentage of filled grain. Planting @ three seedlings per hill produced longer panicles. A spacing of 20 x 15 cm gave the highest grain yield for medium duration rice in Mundakan season. Seedling age ranging from 20 to 35 days# and planting depth ranging from three to eight centimeter as such have no effect on grain yield. A seedling rate of three seedlings per hill provides higher yields. Planting ” 20 day old seedling at 20 x 15 cm spacing or planting seedlings at "three to four centimeter depth with a spacing of 20 x 15 cm gives higher grain yields. Neither the treatment factors nor their interactions influenced straw yield or harvest index.ennullThesis