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Studies on the alfalfa medicago sativa l. production in taekwanryong area i. effects of boron and lime application on the growth and yield of alfalfa



Studies on the alfalfa medicago sativa l. production in taekwanryong area i. effects of boron and lime application on the growth and yield of alfalfa



Korean Journal of Animal Science 32(6): 345-355



This experiment was carried out as a part of the studies on the alfalfa (Medicago sativa L.) production in Taekwanryong area to examine the effects of boron and lime application on the growth and yield of alfalfa. Vernal cultivar of alfalfa was sown on 18 August, 1987 on the experimental field (850 m above sea level) located in Hoengke-2-ri Toam-myon Pyongchang-gun Kangwon-do, Korea, and the alfalfa was cut four times from 5 June to 30 September in the first harvest year, 1988. The plot of born application consisted of 0 kg/ha, 5 kg/ha, 10 kg/ha, 20 kg/ha, 30 kg/ha, 40 kg/ha, and 50 kg/ha of borax application, and the plot of lime application consisted of non-lime application and 3000 kg/ha of lime application. The results obtained were summarized as follows: 1. The yields of alfalfa was strikingly increased by the lime application (p < 0.05). The lime application plot marked 74.86 t/ha of annual fresh forage yield and 11.71 t/ha of annual dry matter yield, while the non-lime application plot showed 34.05 t/ha of annual fresh forage yields and 5.73 t/ha of annual dry matter yield. 2. The wintering ability of alfalfa was remarkably improved by the lime application. In winter survival ratio of the shoots, the lime application plot recorded 66.3%, while the non-lime application plot showed 42.2%. 3. The lime application proved to be definitely effective in accelerating especially the early stage growth of alfalfa. Plant length, surface coverage and density measured at the first cut in the first harvest year were 26.4 cm, 74.4% and 124.7 stems/dm2 respectively in the non-lime application plot, while they were 48.0 cm, 100% and 262.1 stems/dm2 respectively in the lime application plot. 4. In dry matter ratio, significant differences were not recognized among the treatment plots, but a little differences were found among the cutting times through a year. The highest dry matter ratio of 18.6% was recorded at the first cutting time and the lowest ratio of 14.3% was marked at the second cutting time. 5. In dry matter yield, the boron application plots marked higher than the non-boron application blot by 2 .apprx. 8% in the lime application plot, while the former plots recorded higher than the latter by 5 .apprx. 46% in the non-lime application plot (p < 0.05). 6. Optimum level of boron application seems to be 20 .apprx. 40 kg/ha of borax. 7. Dry matter yield did not uniformly increase in proportion of the increase of boron application. 8. In Taekwanryong area, 3000 kg/ha of lime application presented decidedly positive effect in augmenting the productivity of alfalfa, nevertheless the efficacy of boron application appears to need further close study. 9. In Taekwanryong area, the alfalfa production is expected to have a bright future.

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