A new soybean cultivar for soy-paste, 'Daeha 1', was developed by soybean breeding team in the Yeongnam Agricultural Research Institute (YARI) in 2008. A promising line, SS97214-S-S-S-15, was selected from the combination between 'Suwon192' and a pedigree came from cross combination between 'Jangyeobkong' and 'Hwaeomputkong'. It was designated as the name of 'Milyang 164'. It had good result from regional adaptation yield trial (RYT) for three years from 2006 to 2008 and released as the name of 'Daeha 1'. It has a determinate growth habit, white flower, grey pubescence, yellow seed coat, yellow hilum, large spherical seed (25.4 grams per 100 seeds). 'Daeha 1' is tolerant to soybean mosaic virus and bacterial pustule, the major soybean disease in Korea. The average yield of 'Daeha 1' was 2.62 ton per hectare in the regional yield trial (RYT) carried out for three years from 2006 to 2008, which was 5 percent higher than that of check cultivar, 'Taekwangkong'.
The purpose of this study was to investigate interaction effects of genes using a Harvester method. A sample of Korean cattle, Hanwoo (n = 476) was chosen from the National Livestock Research Institute of Korea that were sired by 50 Korean proven bulls. The steers were born between the spring of 1998 and the autumn of 2002 and reared under a progeny-testing program at the Daekwanryeong and Namwon branches of NLRI. The steers were slaughtered at approximately 24 months of age and carcass quality traits were measured. A SNP Harvester method was applied with a support vector machine (SVM) to detect significant SNPs in the CCDC158 gene and interaction effects between the SNPs that were associated with average daily gains, cold carcass weight, longissimus dorsi muscle area, and marbling scores. The statistical significance of the major SNP combinations was evaluated with x2-statistics. The genotype combinations of three SNPs, g.34425+102 A>T(AA), g.4102636T>G(GT), and g.11614+19G>T(GG) had a greater effect than the rest of SNP combinations, e.g. 0.82 vs. 0.75 kg, 343 vs. 314 kg, 80.4 vs 74.7 cm2, and 7.35 vs. 5.01, for the four respective traits (p<0.001). Also, the estimates were greater compared with single SNPs analyzed (the greatest estimates were 0.76 kg, 320 kg, 75.5 cm2, and 5.31, respectively). This result suggests that the SNP Harvester method is a good option when multiple SNPs and interaction effects are tested. The significant SNPs could be applied to improve meat quality of Hanwoo via marker-assisted selection.
Improving the nitrogen use efficiency (NUE) of crops is a technology that improves crop productivity and prevent environmental pollution simultaneously. A way to improve NUE is to develop and use a controlled release fertilizer. We developed a controlled release fertilizer in terms of controlled-release coated fertilizer for rhizosphere application (CRFR) which is a mineral fertilizer applying just under the plant root zone. In order to test effect of the developed CRFR on crop yield and NUE, field experiments were conducted with six levels of N (N 0, N 190, CRFR-N 16, CRFR-N 22, CRFR-N 27, and CRFR-N 33 kg ha -1) at the experimental station of Gyeonggi-do Agricultural Research & Extension Services (GARES) for two years (2017 to 2018). The fruit yield and NUE of red pepper were obtained using agronomic measurements. To determine optimum N rate of CRFR we applied linear-plateau model. Results showed that the yield was not significantly different between the two levels of CRFRs (N 22 and 27) and N 190 in 2017. Similarly, the yield was not different between the three levels of CRFRs (N 22 and 27) and N 190 in 2018 although almost six times as much N rate was applied in the N 190. Meanwhile, NUEs in the CRFRs were ranged from 69.8 to 88.5% which were much higher than the N 190 treatment (14.8%). Since CRFRs showed no different yields as compared to N 190, we analyzed the optimum rate of CRFR using the linear plateau model and CRFR applied at 23.1 kg N ha -1 was optimal for the yield. Our results suggest that CRFR was able to significantly increase crop productivity while reduce environmental pollution because of remarkably high NUE.
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