多年間 施肥條件을 달리해온 논에서 栽植密度의 差異가 水稻收量 및 收量構成要素에 미치는 影響 = Effects of spacings on yield and its components of rice under the defferent fertilities
저자
李殷雄 (서울大學校 農科大學 農學科敎室)
발행기관
학술지명
권호사항
발행연도
1965
작성언어
Korean
KDC
051.000
자료형태
학술저널
수록면
35-54(20쪽)
제공처
Responses of 4 different fertilities maintained for 40 years since 1924 : non-fertilized, composts applied, chemical fertilizers applied and composts plus chemical fertilizers applied as main plots, that of 3 kinds of spacing: 15cm. by 15cm., 20cm. by 20cm., and 25cm. by 25cm. as subplots, and that of 3 different numbers of plants per hill: 2 plants, 4 plants, and 7 plants, as sub-sub plots, upon the yield components of rice were studied at the field designed as split-split plot design. In addition, the qualitative analysis of soils at the main plots was done and its effects on the yield of rice and comparison of yield components were also studied. The results obtained in this trials were as follows:
1. Qualitative analysis of soil.
(1) there were big differences in chemical composition of soil among main plots. The quantities of phosphorus, potassium and organic materials in soils increased at the plots to which composts plus chemical fertilizers were applied. The content of nitrogen and calcium was higher at the compost applied and compost plus chemical fertilizers applied plots. More sodium and magnesium were found at the chemical fertilizers applied plots.
(2) It was shown that the soil pH values varied from 5.3 to 5.4, and the highest value was at the composts plus chemical fertilizers applied plot, irrespective to wetness of soil. But different value of pH was found at the chemical fertilizers applied plot; 5.2 in dry soil and 4.5 in wet soil, respectively. The pH value of non-fertilized plot varied from 5.0 to 4.8 and the pH values of composts applied plot was 5.0.
It was noticed that the pH value was higher in wet plot than in dry soil.
(3) The concentration of cation was highest at the plots where composts plus chemical fertilizers were applied. The pH values observed for respective plots were in the following order, composts plus chemical fertilizers applied>chemical fertilizers applied>composts applied>non-fertilized.
(4) The cation exchange capacity of soil was highest at the composts applied plot and the smae was that at the compost plus chemical fertilizers applied plots. The lowest value of cation exchange capacity was found in the plot of non-fertilized.
(5) Examinations of physical composition of soil showed no differences among plots with 43 to 44% of clay, 5.44 to 5.90% of fine sand, and 43 to 45% of coarse sand to the 3 inches depth from surface.
2. Yield components.
(1) It was observed that culm length was significantly shortened in the plots of non-fertilizers. Whereas, no differences in culm length was observed among fertilized plots. The culm length appeared to be shortened by increasing the number of plants per hill up to 7 and by decreasing the distance of planting space. Accordingly, the shortest culm length was found in the plots with hills of 7 plants and where no fertilizers were applied.
(2) The length of ear showed the same tendency as those of culm length in each plot.
(3) The number of ears per unit area increased remarkably at the plot of composts plus chemical fertilizers. The number of ears per unit area in each plot were following order: composts plus chemical fertilizers applied>chemical fertilizers applied> composts applied> non-fertilized plot. The number of ear in the plot was increased by decreasing the distance of spacing and by increasing the number of plants per hill. Therefore, the number of ears increased by increasing the amount of fertilizers, by decreasing the distance of planting space, and by increasing the number of plants per hill.
(4) There were no significant differences in the grain weights among plots.
(5) The percentum of fertility was highest at the plot of composts and lowest in the plot of chemical fertilizers. As for the planting space, the plot where plants were more densely planted showed lower percentum of fertility than the plot where plants were planted more sparsely. However, the plots in which more number of plants per hill was planted showed lower percentum of fertility as compared with the plot in which the number of plants per hill was less.
(6) Yield of rice was higher in the plot of composts plus chemical fertilizers than that of the plots with chemical fertilizers, composts or non-fertilized. There was not any difference in yield between the plot of chemical fertilizers and the plot of composts.
But very low yield was found at the plot of non-fertilized, amounting to a half of that at the plot of composts plus chemical fertilizers. It was also noticed that the yield from the non-fertilized plot was same as the yield data from the same plot 10 years ago.
The yield was also higher when densely planted and when the large number of plants per hill was given, which is much more remarkable at non-fertilized plot.
3. The effects of different chemical composition of soil on the rice yield.
It was found that the yield of rice was increased apparently with increase in pH value of soil and the concentration of cation in soil. The phosphorus and cation exchangeable capacity of soil was likely to increased the yield of rice. No relationship between yield, and calcium and hydrogen ion in soil was regularly obtained. Data showed that high yield was positively correlated with the pH value, cation concentration and cation exchangeable capacity in the wet soil.
4. Correlation among yield components.
Ear length was positively correlated with culm length, resulting in increase of the number of grains per ear and when such environmental conditions are given the number of ears also increased. when increased the yield with increase in ear weight the straw weight was also increased, while 1,000grain weight remained almost same or somewhat decreased.
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