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KMID : 0903519720150010049
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1972 Volume.15 No. 1 p.49 ~ p.57
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VARIETAL DIFFERENCES IN DISTRIBUTION AND PHYSIOLOGICAL CHARACTERISTICS OF RICEROOT
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박훈/Park, H
김영섭/박영선/김영우/신천수/Kim, Y S/Park, Y S/Kim, Y W/Shin, C S
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Abstract
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Varietal difference in root distribution and other root characteristics were investigated under field and water culture condition. The results were as follows:
1. IR667 showed funnel type of root distribution in soil profile while Jinheung had barrel type, and each type appearance was more distinguishable with fertilizer application.
2. Root weight per tiller was smaller in IR667 than in Jinheung and IR667 had more root in 0 to 5 ㎝ of soil depth but Jinheung had more in 5 to 10 ㎝ depth.
3. Horizontal distribution of root was dencer near to stem base without fertilizer than with fertilizer in both IR667 and Jinheung indicating structural construction for intensive nutrient uptake. Between varieties this $quot;dence to stem base$quot; trend accompaning $quot;dence to wide spacing side$quot; was greater in IR667 without fertilizer and these were quite true with fertilizer in Jinheung.
4. The decreasing rates of root and ear weight by fertilizer application were greater in IR667 than in Jinheung. This and other characteristics indicated that the root of IR667 is likely to be panicle-number type comparing with Jinheung.
5. The root of IR667 had lower oxidizing power of α-naphthylamine than that of Jinheung indicating weaker resistance to reductive soil but cation exchange capacity of water-cultured root was higher in IR667 suggesting stronger nutrient uptake.
6. The content of phosphorus and especially potassium in root were higher with fertilizer but lower without fertilizer in IR667 than in Jinheung indicating that IR667 is more sensitive to root environment.
7. The contents of N, K and CEC were increasing toward root tip while P content was decreasing. The root from surface soil had higher N and K content than that from subsoil.
The contents of N,P,K, and CEC of root at harvesting stage were about 1.0%, 0.1%, 0.5% and 15me/100g at dry weight base, respectively.
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