No-tillage Transplanting System of Rice with Controlled Availability Fertilizer in the Nursery Box II. Improvement of the initial growth or rice in the no-tillage transplanting system

Abstract

The effect of linear type of polyolefin coated urea (POCU) 10 or 30 in combination with sigmoid type of POCU S100 in the nursery box on the improvement of the initial growth of rice in no-tillage transplanting system was studied in light clay soil (alluvial soil) and clay loam soil (Andisol) in Miyagi prefecture, Japan. POCU-10 or POCU-30 (short release type of POCU) in combination with POCU S100 was remarkably more effective in increasing the leaf color value and the number of tillers than those in the POCU s100 treatments, reflecting the rapid release of N from POCU-10 or -30 at the initial growth stage. POCU-10 or POCU-30 in combination with POCU s100 increase the dry matter yield at young panicle initiation stage. The N recoveries from the linear type of POCU-10 and POCU-30 at the young panicle initiation stage were 41 and 30% and 33 and 34% in light clay soil and clay loam soil, respectively. At the harvest time, they were 53 and 53%, and 51 and 68% in light clay soil and in clay loam soil, respectively. The yields of brown rice of NTS 30 were almost the same or higher than those of NTS, whereas those of NTS 10 tended to be lower because of a fewer number of spikelets per m^2.Initial growthNo-tillage transplanting system^NPolyolefin coated ureaRic