No-tillage transplanting system of rice [Oryza sativa] with controlled availability fertilizer in the nursery box, 1: Growth characteristics and yield of rice in three representative paddy soils
2000
Hossain, Md.Z. (Tohoku Univ., Sendai (Japan). Faculty of Agriculture) | Shibuya, K. | Saigusa, M.
No-tillage (NT) transplanting system of rice (Oryza sativa L. cv. Hitomebore) was conducted using controlled availability fertilizer (CAF) to study the effect of NT system on growth characteristics and yield of rice in representative three paddy soils (light clay Alluvial soil, sandy loam Alluvial soil and clay loam Andisol). The cumulative N release from the sigmoid type of polyolefin coated urea (POCUS)-100 was only 3-3.5% during the nursery stage. The leaf color values of rice plants at early growth stage in NT transplanting system were lower than those of the conventional tillage (CT) transplanting system. The tillering capacity of rice plant in NT transplanting system was lower than that of CT transplanting system, and the percentage of productive tiller was larger in NT transplanting system in all three soils. The number of productive tillers per square-meter of NT with straw treatment (NTS) of all types of soil were larger than that of NT treatment. There were no significant difference in root distribution in the subsoil between NT and CT treatment. At harvest stage, averaged dry matter yields over two seasons in NT or NTS treatments were about the same as the CT with rice straw (CTS) treatment in three soils. The panicle dry matter yields of NT and NTS treatments were greater than that of CTS treatment in two soils. The yield of brown rice of NT treatment was 5.58-5.93, 5.47-6.35 and 5.18-6.34 Mg/ha for the light clay Alluvial soil, sandy loam Alluvial soil and clay Andisol, respectively. In contrast, the CT treatment yielded 5.67-6.07, 4.68-6.60 and 4.13-6.74 Mg/ha in these three soils. The initial growth of rice in NT system was slower than that of CT system. However, the yield of brown rice in NT system was almost same or greater than that of CT system reflecting releasing characteristics of POCUS fertilizer
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