|Title:||宜蘭低產水田土壤與性質施用矽酸鈣、稻草、重肥及暗渠排水改良效果關係之研究||Other Titles:||Response of Rice to Amandment with Slag, Straw and Under-Ground Drainage in Relation to Soil Characters of Low Yield Paddy in Ilan Area||Authors:||陳春泉
|Issue Date:||2-Jun-1978||Publisher:||農業試驗所||Journal Volume:||27||Journal Issue:||2||Start page/Pages:||142-158||Source:||中華農業研究||Abstract:||
1. Big portion of paddy field in Ilan area is low in yield due to shallow soil or poor draianage. It is an important problem for that area.
2. Field experiments were carried out on shallow paddy soil in Sansin by applying slag, straw, heavy dosage of P and K and split application of K at panicle initiation. And these treatments plus under-ground drainage were applied on imperfetly drained paddy in Tungshan. Drainage was made by digging parall ditches 50 cm apart one another,cm deep, 10 cm wide and filled with rice hull to 25 cm below soil surface then covered with soil.
3. Results showed that in imperfectly drained soil, drainage increased grain yield 15%
the first crop and 5.4% in the 2nd crop when it was coupled with straw application. But 13% increase in the first crop and 10% in the 2nd crop was obtained by drainage from plots without straw application.
4. In Tungshan, 31% increase of grain yield by application of straw in first crop, and 21% increase by residual effect of straw in second crop. So that rice response to straw application on soil of low yield.
5. In Tungshan, heavy dosage of P and K and split appliction of K at panicle initiation increased grain yield by 11.5% in first crop and only 0.4% in secDnd crop.
6. In Tungshan, heavy dosage of P and K and split application of K at panicle initiation plus 3,000 kg/ha of slag (900kg/ha SiO2) increased grain yield by 45.7 % for first crop and 14.8% for second crop.
7. Rice was not possitively affected by straw in fairly productive sil by good management in Sansin field.
8. In Sansin field, heavy fertilization and slag treatments raised grain yield insignificantly but they raised straw yield of first crop at 5% level of significant.
9. Grain yield of Sansin field was highly correlated with thickness of surface soil and thickness of soil profile with coefficient of 0.48** and 0.49** respectively, but yield did pnot increase with soil depth in the portion of > 65 cm. In other words it is hardly to expect very high yield of rice in shallow soils. And no better effects might be expected by increasing depth of medium textured soil from 65 cm to deeper one.
10. In Tungshan field, slag and under-dround drainage were suitable ways for improving paddy soil. Minimizing blast disease was the main reason. Very carefull and effective control of blast made the function of slag invisible in Sansin field.
11. In Tungshan field, under-ground drainage was a better way for blast control of rice in comparison with fungicide. Slag was better than fungicide for the same purpose in both Tungshan and Sansin fields.
12. Drainage increased Si content of rice plants and there was a tendence to increase availability of other elements. in the Soil.
13. Soil in Sansin field contains more exchangeable Ca, Mg and available P and K resulting in higher content of these elemants in rice plants, and was more productive than that of Tungshan field. So that plant coupled with soil analyses may provide some information for soil amendment practices.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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