|Title:||中部粘板岩沖積土性質與水稻生長及產量之關係研究||Other Titles:||Characteristics of the Slate Alluvial Soils in Central Taiwan Associated with the Growth of Lowland Rice||Authors:||李子純
T.S. Lee Wang
|Issue Date:||2-Dec-1974||Publisher:||農業試驗所||Journal Volume:||23||Journal Issue:||4||Start page/Pages:||242-254||Source:||農業研究||Abstract:||
To evaluate soil characteristics of the slate alluvial soils in central Taiwan as related to the growth and yield of rice, a greenhouse experiment was carried out simultaneously with a field trail. Eight soils were selected from Cho Shui irrigation area, including both new and old slate alluvial soils belong to six different soil series (This report includes only the greenhouse experiment).
Two treatments (with and without fertilizer) with five replicates, a total of 80 pots were arranged in eight rows in a completely randomized design in the greenhouse. The fertilizers used in the first crop (April to August)were N, 100 ppm, P, 50 ppm, and K, l00 ppm as ammonium sulphate, calcium superphosphate and potassium chloride respectively. It was the same in the second crop (August to December) except that of K was only 50 ppm.
The items analyzed in this experiment were soil properties, soil solution determination and plant analysis in both the vegetative and reproductive phase of the rice plant. After harvesting, the yield and yield components were recorded and the straw and grain were analyzed.
Of the eight soils used in this experiment, the highest yielding soils were soils No. 4, 2, and 7. The lowest were soils No. 3, and 5. The difference was much wider in the first than in the second crop.
A very significant negative correlation was found between grain yield and the pH values and HCO3- content in the soil solution in most of the sampling period.
The pH values of the eight soils used ranged from 6.2 to 7.8, some of them were calcareous soil. Six weeks after transplanting, the pH values were between 6.2 and 7.3, a difference of only I unit. Though pH per se generally is not regarded as an important factor in affecting plant growth, it influences the nutrient content in the soil solution, thus, affecting the growth and yield of the rice plant. It was found in this experiment that the pH values in the soil solution were significantly correlated with the HCO3-, Ca2+ and Mg2+ content in the soil solution, but negatively correlated with the NH4+, K+ and Fe2+ content in the soil solution.
By comparing the relation between nutrient content in plant tissue during the course of plant growth and the related nutrients in the soil solution of the same period, it was found that the K content in the rice plant was negatively correlated with the HCO3- content in the soil solution. This shows that the HCO3- content in the soil solution of some of the soils in this experiment did reach the level to retard potassium uptake.
The phosphorus content in the rice plant was also found negatively correlated with the pH values of the soil solution. Phosphorus absorption was retarded in some of the soils with higher pH values in this experiment. It is due to the fact that when pH values is above 7, the excess calcium may further hinder phosphorus absorption and utilization.
In conclusion, the low yield of some slate alluvial soils in central Taiwan may be caused by the abnormally high concentrations of HCO3-, Ca2+, and Mg2+ produced during the course of rice growth.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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