Varietal response on different planting densities in rice
1989
Son, Y. | Park, S.T. | Kim, S.C. | Lee, S.K. (Rural Development Administration, Milyang (Korea R.). Yeongnam Crop Experiment Station) | Lee, S.S. (Yeongnam Univ., Kyongsan (Korea R.). Coll. of Agriculture)
This experiment was conducted to understand the response of planting density in rice. Two rice cultivars, Chilseongbyeo (Tongil-type) and Nagdongbyeo (Japonica-type), were planted at 8 density levels, 2, 15, 22, 31, 50, 100, 200 and 400 hills per m** (2). The number of spikelets per unit area increased with the increasing plant density level to a certain level while no further increment was observed after this level in both cultivars tested. Chilseongbyeo which is semi-dwarf with erect leaf exhibited slow reduction in crop growth rate after heading, and grain ripening percentage under extremely high planting density compared to Nagdongbyeo which is tall height with droopy leaf. Chilseongbyeo showed the maximum grain yield around 100 hills per m** (2) and slightly reduction with futher increment of planting density. However, the maximum yield was found around 22 hills per m** (2), and grain yield decreased rapidly above this density level
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