Which of the following statement is not true about SRI?

System of rice intensification (SRI) is a method of rice cultivation which was first time developed in Madagascar, 1980 by French scientist Henrie de laulanie. In India it was first started in TNAU, Coimbatore followed by AP.  It ensures 30-50 yield increment. SRI involves the following set of practices 1.      Raised bed nursery with seed rate of 5 kg/ha. 2.      Transplanting young seedling 8-10 days old 3.      Planting only 1 seedling /hills at wider spacing (25 ×25 cm) 4.      Field are not flooded rather wet upto vegetative stage, after that 1-2 inch of water 5.      1-2 hand weeding after 10-12 DAT and mechanical weeding by conoweedee 6.      Organic manure application