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RISS 인기검색어
- 검색키워드
- 저자 : 심재성 ( Yeun Kyu Jung (검색결과 2 건)
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석회 및 3 요소 수준이 겉뿌림 산지초지에 미치는 영향 4 . 토양 및 목초중 무기양분의 상호균형과 Grass tetany 위험성
정연규,김강식,심재성 ( Yeun Kyu Jung,Kang Sik Kim,Jai Sung Shim ) 한국축산학회 1982 한국축산학회지 Vol.24 No.6
This field experiment was undertaken to assess the effects of two rates of Ca(OH)₂(0, 250 ㎏/l0a) and five rates of N-P₂O_5-K₂O (0-0-0, 0-10-10, 6-15-15, 12-20-20, 24-25-20 ㎏/l0a) on the grassland establishment, forage yield and quality, botanical composition, and persistence of different forage species in a mixed grass/clover sward established by oversowing method on new reclaimed steep mountain. This fourth part was concerned with the mutual balance of mineral nutrients and grass tetany hazard. The results obtained were summarized as follows; 1. Concentration of exchangeable Mg, relative proportions of Mg to CEC, K, and Ca in soil were considerably below the critical level for good forage growth and likelihood of grass tetany. These properties were handicapped by liming and increasing the NPK rate. 2. Comparing with the critical level for likelihood of tetany (Mg$lt;0.2%, K$gt;2.5%, and K/(Ca+Mg)$gt;2.2 in forages), mean concentration of Mg ranged from 0.09 to 0.15%, that of K exceeded 2.5% from 15㎏ K₂O/ l0a rate. The K/(Ca+Mg) ratios of mixed forages showed above 2.2 at no lime and below at liming, when averaged over NPK rates. The increase of Ca concentration and botanical composition of legume in mixed sward by liming resulted in the reduce of K/(Ca+Mg) ratio in mixed forages. 3. The ratios of K/(Ca+Mg) in mixed forages were increased by increasing the NPK rate and that exceeded 2.2 from 10㎏ K20/l0a rate at no lime and showed around 2.2 from 20㎏/l0a rate at liming. 4. The value of % (N x 6.25) x % K in mixed forages was increased and Mg concentration was reduced by increasing the NPK rate. As a result, it was expected for decrease of blood serum-Mg concentration in cattle, and for increase of tetany hazard. 5. To prevent grass tetany resulting from low Mg concentration and unbalanced ratios of mineral nutrients, Mg fertilization on grassland and/or extra Mg supplement to cattle were to be necessary. 6. The Ca/P ratios ranged from 1:1 to 3.2:1, and they varied with the levels of lime and NPK applications. At liming, higher amount of P fertilizer should be applied to maintain the optimum Ca/P ratio in mixed forages.
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석회 및 3 요소 시용수준이 겉뿌림 산지초지에 미치는 영향 3 . 목초의 무기성분함량 및 3 요소 이용율의 변화
정연규,이종열,심재성 ( Yeun Kyu Jung,Jong Yeal Lee,Jai Sung Shim ) 한국축산학회 1982 한국축산학회지 Vol.24 No.6
This field experiment was undertaken to assess the effects of two rates of Ca(OH)₂ (0, 250 ㎏/l0a) and five rates of N-P₂O_5-K₂O (0-0-0, 0-10-10, 6-15-15, 12-20-20, 24-25-20 ㎏/l0a) on the grassland establishment, forage yield and quality, botanical composition, and persistence of different forage species in a mixed grass/ clover sward established by oversowing method on new reclaimed steep mountain. This third part was concerned with the concentrations and uptake of mineral nutrients, and percentage recovery of NPK. The results obtained were summarized as follows; 1. Liming increased concentrations of N, Ca, Mg and Na in mixed forages, but effect of liming on concentrations of K and P was inconsistent. By increasing the NPK rate, concentrations of N, P, K, Rnd Ns in mixed forages were increased, whereas Ca and Mg concentrations tended to be reduced. 2. Overall values of Mg concentrations in mixed forages were below 0.15%. That value is considerably below 0.15%. That value is considerably below the critical level for forage growth and likelihood of grass tetany ($lt;0.2%). Amounts of individual and total mineral uptake, and total concentration of minerals were increased by both liming and increasing the NPK rate. 3. Liming increased markedly the percent recoveries of N,P and K, Percent recovery of N was reduced by increasing the N rate, whereas those of P and K were inconsistently affected by their application rates. The percent recoveries of N, P and K by mixed forages were highest in the order; K$gt;N$gt;P. 4. Forage quality was greatly influenced by both liming and applications of NPK. Concentrations of N, P, K, Ca, Mg and Na were lower in weeds than in seeded forages.
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