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KMID : 0903519670080010051
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1967 Volume.8 No. 1 p.51 ~ p.59
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Effect of Yearly Application of Straw and Nitrogen , Phosphate and Potassium Fertilizer on the Growth and Yield in Rice
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Abstract
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A split plot was laid out in 1965 for perennial application of straw by 500㎏ per 10 are, as main plot, and of chemical fertilizer in conventional way, as sub-plow. The sub-plot included the following 5 fertilizer treatments as ① non-fertilized, ② nitrogen-free, ③ phosphate-free ④ potassium-free, ⑤ completely fertilizer applied plots.
Trends in the growth and yield of rice was observed at present experimental site in the first year, 1963, and second year, 1966, as follows:
1. Each treatmental plot showed nearly identical trends between the first and second year, in term of growth, yield and yield components.
2. Straw application deterred the initial growth at non-fertilized and nitrogen-free plots. But straw application raised the effective stem ratio and enlarged the values it yield components, finally to be resulted in the second year with significant difference.
3. Both phosphate and potassium did not much affected to plants for longer stem and larger number of tillers.
4. Effect of nitrogen, phosphate and potassium was recorded as investigated by previous research works. Phospate deficiency decreased maturing rate to a great extent.
5. Numerical index was calculated for the comparison of plots in yield. where the non-straw, completely fertilizer applied plot stands for 100.
The indexes of the first and second year were as follows:
at non-straw plot(indexes in the blank are from the first year trial); non-fertilized : 80.2 (80.9), nitrogen-free: 83.6(89.4), phosphate-free : 89.4(93.1) and potassium-free plot: 93.5 (102.4) at non-straw plot. On the other hand, indexes at straw applied plots were non-fertilized : 84.0(86.6), nitrogen-free : 82.6(93.9), phosphate-free : 91.7(96.3), potassium-free: 103.2(102.0) and complete plot: 98.7(109.8).
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