Effect of the phosphorus-medium used to the single application of fertilizer in nursery box on the growth and phosphorus uptake of rice plant (Oryza sativa L.)
2007
Heinai, H.(Tohoku Univ., Sendai (Japan)) | Saigusa, M. | Sato, T. | Harada, N.
The effects of use of the phosphorus medium (P-medium) as nursery bed soil on the growth and nutrient uptake of rice seedlings (Oryza sativa cv. Hitomebore) were examined. The ratio of shoot dry weight to shoot length of rice seedlings was improved when treated with P-medium. Nitrogen, phosphorus and potassium contents of rice seedlings in the P-medium treatment plot were the same as those in the control plot. On the other hand, silicon content was increased with P-medium. The effects of co-situs application of the P-medium on the growth and phosphorus uptake of rice plants were also examined in pot experiments. Two types of soil were used in this experiment, subsoil from a Zao and subsurface soil from a Mouka paddy field. The dry weight, amount of phosphorus uptake and phosphorus recovery rate of rice plants with P-medium treatment were the same or more than those in the triple superphosphate treatment plots (side-dressing and broad casting) in both soil types. Rice plants were grown again without phosphorus application in the Zao soil after harvest of the first cultivation. The dry weight and amount of phosphorus uptake were highest in the P-medium treatment plot. The cumulative recovery rate of phosphorus fertilizer was also highest in the P-medium treatment plot (about 60%).
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