|Title:||中部粘板岩冲積土若干土系之特性與水稻生育、收量之關係||Other Titles:||A Study on Soil Characteristics-Yield Relationships among Some Soil Series of the Slate Alluvial Soils in Central Taiwan||Authors:||連深
|Issue Date:||2-Jun-1976||Publisher:||農業試驗所||Journal Volume:||25||Journal Issue:||2||Start page/Pages:||93-107||Source:||中華農業研究||Abstract:||
A total of eight and thirty four localities respectively, in 1973 and 1974 were set up on some wide-spread soil series of slate alluvial origin in central Taiwan with different drainage conditions, ages of deposition, and ranging from moderately coarse to fine in texture profiles, The growth and yield of the rice plants in these localities were compared under the standardized cultural practice and with ample application of N P K fertilizers, and the soil characteristics associated with yield difference were studied.
1. The mean natural permeabilities measured before the practice of field drying of the soil series of different drainage classes as classified by soil survey, i. e., well to moderately well, imperfect and poor were 0.80, 0.35 and 0.06 cm/day, respectively showing significant differences among each other. Thus the drainage classes determined by the morphological characteristics of profiles quite reflect their respective drainage status.
However considerable variations of permeability were also observed among the soil series of same drainage class hut with different texture profiles, e. g., the coarse textured Kuanhsutseu series has a significantly higher permeability compared with the fine textured Lukang series although both of them belong to the imperfect class.
2. The grain yields also differ among the soil series of different drainage classes according to the following order, i. e., well to moderately well>imperfect>poor, particularly in the second crop and the means were 5. 51, 5.00 and 4.53 ton/ha, respectively. Considerable differences in yield, however, were also observed among the soil series of the imperfect class but with different texture profiles, e. g., the yield of Kuanhsutseu series was significantly higher than that of Lukang series which was in accordance with the greater permeability of the former compared with that of the latter.
3. The studies of simple as well as multiple regressions between yields and various soil characteristics also revealed significant positive correlation between permeability and rice yield in the second crop. There were no particular disorder of any nutrient elements observed in the low yielding rice plant except that potassium content was sometimes lower slightly. Significant improvement in rice growth was observed by the practice of surface drainage or rotation in such cases. Thus the drainage status of soil can be considered most important governing rice yield in this area as far as the scope of soils studied.
4. In general, the soils with poor drainage have higher values of pH, CEC and contents of organic matter and CaCO3 which might be due to the physiographies of the localities. Moreover, the older alluvial soils also have higher organic matter content and CEC than the rescent alluvials soil (e. g., Erhlin series compared with Erhshui series) due to the time of weathering longer. 1-lowever rice yields were not affected by these extents of fertility difference due to the difference easily covered by the intensive fertilization practice prevailed or by the drainage factor dominating.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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