In this study, we collected 29 Kenaf (Hibiscus cannabinus L.) genetic resources from 10 countries to confirm the possibility of the introduction into Korea. The Kenaf (Hibiscus cannabinus L.) has the broad industrial use like feed and the 5 times more strong CO2 absorption capacity compared to general plant. So recently it is considered as a good industrial source. We analyzed ecotype, growth and development, yield and feed value of collected resources. They were divided into 3 groups depending on flowering time, early maturing type blooming in early July, mid-late maturing type blooming from end of August to early September and late maturing type blooming in end of October. Early maturing type could get fruitful seed but dropped yield (average 7,895 ㎏/10a) and late maturing type could get high yield (average 12,572 ㎏/10a) but deletion. The other side mid-late maturing type could get yield over a certain level (average 11,207 ㎏/10a) and fruitful seed was ensured. The yields analyzed by resources indicated that K12 (Hongma 300) collected in China, K25 from India, K22 from Russia and K21 (Khonkaen 60) variety from China were more than 13,500 ㎏ per 10a. Feed value of early maturing type had inclined to more better than other types, but like dry digestible matter (DDM) and dry matter intake (DMI) of some late maturing types like K12, K21, K22 which had a high yielding ability were more better than that of early maturing types'. So relative feed value (RFV) which considered comprehensive item for feed value were indicated K21 was 102.5, K12 was 116.2 and K22 was 120.2. 'Jangdae' the variety developed in Korea which could complement of other types' had a good quality for yield 10,975 ㎏/10a and 12.5% crude protein content and 101.9 of the relative feed value. So we need to be taken power to collection of mid-late maturing types resources.
This study was conducted to investigate the physical and chemical properties of soils in Saemangeum reclaimed lands. The investigated areas were total 5,020 ha which included 220 ha for Agricultural Life site,
Pelletized livestock manure compost is easy to handle and thus increasingly used as an orgranic amendment. The effectiveness of granular livestock manure compost (GLMC) was investigated at different times, with 5, 15, 25 and 35 days before transplanting rice plots. After two years of administration of GLMC, pH, available P 2 O 5 , exchangeable K, Ca, and Mg decreased and organic matter content increased, compared to the soil before the test. The faster the treatment time of GLMC, the lower the organic matter content. But the T-N was the same in the control, 5 and 15 days before transplanting rice plots. In flooded soil, the N mineralization of GLMC proceeded 2 weeks later than inorganic fertilizers and 1 week later than livestock manure compost. Rice growth and quantity showed similar results in control and 25 days before transplanting rice plot. When GLMC was used, the protein content of white rice was lower than that of control plot, and there was no difference in amylose, whiteness, and palatability. The correlation between the white rice quantity and the treatment time of the GLMC was Y = -0.075X 2 + 3.982X + 492.74 (R 2 = 0.7722), and the treatment time to obtain the highest quantity of white rice was 26.5 days.
BACKGROUND: To evaluate the application level of expeller cake fertilizer(ECF), we have investigated soil chemical properties, leaf mineral contents and yield of tah tasai Chinese cabbage in a plastic film greenhouse. METHODS AND RESULTS: Five levels of fertilizer were applied as 0%(ECF 0), 50%(ECF 50), 75%(ECF 75), 100% (ECF 100) and 150%(ECF 150) by base 1,848 kg/ha of ECF. In 2012, tah tasai Chinese cabbage was planted on April 28 in a silt loam soil and harvested on July 12. Commercial yields were measured 10 times from May 10 to July 12. Electrical conductivity (2.24∼3.09 dS/m), available P 2 O 5 (484∼581 mg/kg) and exchangeable cations(K + , Ca 2+ and Mg 2+) were tended to increase by the application of ECF. However, the range of those was not significant. The contents of T-N, K, Ca and P of tah tasai Chinese cabbage leaves were 62.2∼66.5 g/kg, 44.3∼48.7 g/kg, 5.1∼5.9 g/kg and 5.6∼6.2 g/kg, respectively. The nitrogen utilization rate of tah tasai Chinese cabbage was 39.4∼51.6%, and it was decreased with increased application amount of ECF. The yield of tah tasai Chinese cabbage was 9,806 to 12,730 kg/ha on the basis of application amount of ECF and it was not increased in spite of increased ECF. CONCLUSION: The optimum dose of application of ECF for cultivation of tah tasai Chinese cabbage was ranged from 924 kg/ha(as ECF 50) to 1,386 kg/ha(as ECF 75). Environment-friendly and economical amount of applied fertilizer is more important than yield for cultivation of tah tasai Chinese cabbage.
This study was carried out to investigate the physico-chemical properties and water-soluble nutrients content in 160 samples of upland and 120 samples of orchard in Jeonbuk province. The mean depths of horizon A of the upland and orchard soils were 24.2 ± 4.2 cm and 27.8 ± 5.9 cm, respectively. Soil pH, EC, and organic matter contents were within the optimal range for upland and orchard soils, but available phosphate and exchangeable K, Ca, and Mg were higher than the optimal range; e.g., available phosphate concentrations were higher than the optimal range by 52.8% for the upland and 61.7% for the orchard. Water-soluble Mg 2+ , Cl -, and SO42were higher in upland than orchard soils, and K + , Ca
2+, NO3-, and PO4 3showed an opposite pattern. These results provide fundamental information of the properties of upland and orchard soils in Jeonbuk province for better management of soil fertility.
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