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KMID : 0903519680090010119
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1968 Volume.9 No. 1 p.119 ~ p.124
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Effects of the time , and the rate of potassium fertilization at nursery stage on the rooting activity in paddy rice plant
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Abstract
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In order to learn the effect of timing and rate of potash fertilization in the rice plant nursery on the root growth and the vegetative growth of later stage a pot experiment was carried out employing $quot;Jaekun$quot; a rice variety. Potassium Chloride was applied at the rate of 0∼100g K₂O/3.3㎡ right before, and 30 days after seeding. Forty-day old seedlings were transplanted three times successively at the one week intervals with the roots cut each time. Each subject was observed in rooting and other useful traits. A part of seedlings after the third root scission were cultured intact thereafter and the yield characters examined. The results were shown as:
1. The rate of sound seedlings was high in the case that a small amount of potassium was applied as the basic placement while the application of the fertilizer over 75g/3.3㎡ (as K₂O) yielded a far less crops.
2. The plant height, number of tillers, number of leaves, and grass weight increased as the amount of potassium was elevated. However, the application of 50 g K₂O/3.3㎡ in the basic placement and that of 75g K₂O/3.3㎡ were the peaks over which the above mentioned characters were weakened.
3. As the amount of potassium was increased the increment in number of rooting was notable, especially when the scission of roots was repeated within the limit of 50∼75g K₂O/3.3㎡.
4. In the maximum root newly shooted length indicated was about the same tendency although no statistical significance was observed.
5. The plant height, number of tillers, and variation of weight between grass and root indicated a similar tendency as the number of root shoot.
6. The differences in number of ears, grain yield, and weight of straw between the treatments were not so great but showed somewhat similar trend as in the growth of transplanted plants. In the treatment-100g K₂O/3.3㎡ the yield (ears, grain and straw) decreased as in the non-fertilized.
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