3,379 research outputs found
Holocene tectonic activity of the Hengchun Peninsula as evidenced by the deformation of marine terraces
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Holocene tectonic activity in the Hengchun Peninsula as evidenced by a deformation of marine terraces
No full textThermal/pH Sensitive Core-Shell Copolymer Latex and Its Potential for Targeting Drug Carrier Application
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(5(3-4):14-22)黃麻與鐘麻對於肥料三要素吸收性能之比較研究
No full textJute, Hoowae blue No.7 and kenaf, Madras red, were grown at the different rates of fertilization and a study. was made on the different behaviors. in the uptake of nutrient elements between them. Pot culture with the same treatments was also conducted so as to collect the shedded leaves during growth and the nitrogen content in leaves between jute and kenaf was compared.
The dry matter content both of jute and kenaf increased significantly with the increasing rate of fertilization up to a certain level, beyond which, however, an increased supply of fertilizers was unaccompanied by further striking increase in plant growth. The optimum nutrient level is likely to be less for kenaf than for jute.
Both in jute and kenaf, the percentage of nitrogen and potash increased almost consistently with the increasing rate of fertilizers application. However, the degree of increment was much more significant in the case of kenaf. Increase in fertilization had little effect ‘on the percentage of phosphoric acid in jute, but the reduction in the percentage of phosphorus with the increase in fertilization was found in kenaf. By comparing the average percentage of nitrogen, and potash between jute and kenaf, it was found that jute was high in nitrogen and low in potash. The difference in the percentage of phosphoric acid between them were insignificant. A similar result as stated above was obtained in the amount of nutrient element taken by these two crops.
Though most of the correlation coefficients between individual nutrient element were found positive, the significant correlation was found only between nitrogen and potash in both jute and kenaf. This finding may emphasize the importance of applying balanced nitrogenous and potash fertilizer for the growth of these two crops. Similar result was obtained in partial correlation, but an exception was found on the negative value of the partial correlation between nitrogen and phosphorus of kenaf. which indicates that the response of the phosphatic fertilizer on the production of kenaf fiber is very small.
The relationship between the dry matter content of shedded leaves and that of plant was studied in greenhouse condition and the amount of nutrient compositions of shedded leaves returned to soil by jute and kenaf were determined and discussed. No apparent difference in the nitrogen content of shedded leaves was found between jute and kenaf, but there was a striking difference in root distribution throughout the soil profile.
本試驗之目的在比較兩種麻類對于三要素吸收之性能及其落葉中所含氮成分之差異，藉江探討該兩項作物對于三要素之需要狀況及其對于上壤養分補選作用之關係。所用之黃麻品種為虎尾一青皮7號，鐘麻為Madras red.三要素施用量分為五平準，其中包括空白區。經田間與盆栽試驗結果。獲知兩種麻類對于氮鉀的需要均甚迫切，但因麻類的不同，在需要量上則有顯著差異，一般言之，鐘麻之含氮百分率與其需耍量均高于黃麻。而黃麻之含鉀百分率與其需要量則高于鐘麻。該兩種麻類對于磷肥的需要量均甚低，其中尤以鐘麻為然。兩種麻類落葉中含氮百分率差異不顯著。但落葉收量與麻株乾物量成正比，而鐘麻的植株收量一般均高于黃麻，因而鐘麻對于土壤養分的歸還可能較黃麻為多，同時鐘麻根群深達心土，對于表上養分的消費可能較黃麻為少
The Effect of Outward Investment to Mainland China on Domestic R&D:A Two-Hurdle Model with Endogenous ODI
No full textA study of Landscape diversity and soil heavy metal pollution at an agricultural landscape
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